https://source.android.com/ 
/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.webkit;

import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.annotation.Widget;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Picture;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.net.http.SslCertificate;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.RemoteException;
import android.os.StrictMode;
import android.print.PrintDocumentAdapter;
import android.util.AttributeSet;
import android.util.Log;
import android.util.SparseArray;
import android.view.DragEvent;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewDebug;
import android.view.ViewGroup;
import android.view.ViewHierarchyEncoder;
import android.view.ViewStructure;
import android.view.ViewTreeObserver;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.accessibility.AccessibilityNodeProvider;
import android.view.autofill.AutofillValue;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.textclassifier.TextClassifier;
import android.widget.AbsoluteLayout;

import java.io.BufferedWriter;
import java.io.File;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.List;
import java.util.Map;


A View that displays web pages.

Basic usage


In most cases, we recommend using a standard web browser, like Chrome, to deliver
content to the user. To learn more about web browsers, read the guide on

invoking a browser with an intent.

WebView objects allow you to display web content as part of your activity layout, but
lack some of the features of fully-developed browsers. A WebView is useful when
you need increased control over the UI and advanced configuration options that will allow
you to embed web pages in a specially-designed environment for your app.

To learn more about WebView and alternatives for serving web content, read the
documentation on

Web-based content.

/**
 * A View that displays web pages.
 *
 * <h3>Basic usage</h3>
 *
 *
 * <p>In most cases, we recommend using a standard web browser, like Chrome, to deliver
 * content to the user. To learn more about web browsers, read the guide on
 * <a href="/guide/components/intents-common#Browser">
 * invoking a browser with an intent</a>.
 *
 * <p>WebView objects allow you to display web content as part of your activity layout, but
 * lack some of the features of fully-developed browsers. A WebView is useful when
 * you need increased control over the UI and advanced configuration options that will allow
 * you to embed web pages in a specially-designed environment for your app.
 *
 * <p>To learn more about WebView and alternatives for serving web content, read the
 * documentation on
 * <a href="/guide/webapps/">
 * Web-based content</a>.
 *
 */
// Implementation notes.
// The WebView is a thin API class that delegates its public API to a backend WebViewProvider
// class instance. WebView extends {@link AbsoluteLayout} for backward compatibility reasons.
// Methods are delegated to the provider implementation: all public API methods introduced in this
// file are fully delegated, whereas public and protected methods from the View base classes are
// only delegated where a specific need exists for them to do so.
@Widget
public class WebView extends AbsoluteLayout
        implements ViewTreeObserver.OnGlobalFocusChangeListener,
        ViewGroup.OnHierarchyChangeListener, ViewDebug.HierarchyHandler {

    private static final String LOGTAG = "WebView";

    // Throwing an exception for incorrect thread usage if the
    // build target is JB MR2 or newer. Defaults to false, and is
    // set in the WebView constructor.
    private static volatile boolean sEnforceThreadChecking = false;

    
 Transportation object for returning WebView across thread boundaries.

/**
     *  Transportation object for returning WebView across thread boundaries.
     */
    public class WebViewTransport {
        private WebView mWebview;

        
Sets the WebView to the transportation object.

Params:
  • webview – the WebView to transport
/**
         * Sets the WebView to the transportation object.
         *
         * @param webview the WebView to transport
         */
        public synchronized void setWebView(WebView webview) {
            mWebview = webview;
        }

        
Gets the WebView object.

Returns:the transported WebView object
/**
         * Gets the WebView object.
         *
         * @return the transported WebView object
         */
        public synchronized WebView getWebView() {
            return mWebview;
        }
    }

    
URI scheme for telephone number.

/**
     * URI scheme for telephone number.
     */
    public static final String SCHEME_TEL = "tel:";
    
URI scheme for email address.

/**
     * URI scheme for email address.
     */
    public static final String SCHEME_MAILTO = "mailto:";
    
URI scheme for map address.

/**
     * URI scheme for map address.
     */
    public static final String SCHEME_GEO = "geo:0,0?q=";

    
Interface to listen for find results.

/**
     * Interface to listen for find results.
     */
    public interface FindListener {
        
Notifies the listener about progress made by a find operation.

Params:
  • activeMatchOrdinal – the zero-based ordinal of the currently selected match
  • numberOfMatches – how many matches have been found
  • isDoneCounting – whether the find operation has actually completed. The listener may be notified multiple times while the operation is underway, and the numberOfMatches value should not be considered final unless isDoneCounting is true.
/**
         * Notifies the listener about progress made by a find operation.
         *
         * @param activeMatchOrdinal the zero-based ordinal of the currently selected match
         * @param numberOfMatches how many matches have been found
         * @param isDoneCounting whether the find operation has actually completed. The listener
         *                       may be notified multiple times while the
         *                       operation is underway, and the numberOfMatches
         *                       value should not be considered final unless
         *                       isDoneCounting is {@code true}.
         */
        public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches,
            boolean isDoneCounting);
    }

    
Callback interface supplied to postVisualStateCallback for receiving notifications about the visual state. 
/**
     * Callback interface supplied to {@link #postVisualStateCallback} for receiving
     * notifications about the visual state.
     */
    public static abstract class VisualStateCallback {
        
Invoked when the visual state is ready to be drawn in the next onDraw. 
Params:
  • requestId – The identifier passed to postVisualStateCallback when this callback was posted.
/**
         * Invoked when the visual state is ready to be drawn in the next {@link #onDraw}.
         *
         * @param requestId The identifier passed to {@link #postVisualStateCallback} when this
         *                  callback was posted.
         */
        public abstract void onComplete(long requestId);
    }

    
Interface to listen for new pictures as they change.

Deprecated:This interface is now obsolete.
/**
     * Interface to listen for new pictures as they change.
     *
     * @deprecated This interface is now obsolete.
     */
    @Deprecated
    public interface PictureListener {
        
Used to provide notification that the WebView's picture has changed. See WebView.capturePicture for details of the picture. 
Params:
  • view – the WebView that owns the picture
  • picture – the new picture. Applications targeting VERSION_CODES.JELLY_BEAN_MR2 or above will always receive a null Picture.
Deprecated:Deprecated due to internal changes.
/**
         * Used to provide notification that the WebView's picture has changed.
         * See {@link WebView#capturePicture} for details of the picture.
         *
         * @param view the WebView that owns the picture
         * @param picture the new picture. Applications targeting
         *     {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR2} or above
         *     will always receive a {@code null} Picture.
         * @deprecated Deprecated due to internal changes.
         */
        @Deprecated
        void onNewPicture(WebView view, @Nullable Picture picture);
    }

    public static class HitTestResult {
        
Default HitTestResult, where the target is unknown.

/**
         * Default HitTestResult, where the target is unknown.
         */
        public static final int UNKNOWN_TYPE = 0;
        
Deprecated:This type is no longer used.
/**
         * @deprecated This type is no longer used.
         */
        @Deprecated
        public static final int ANCHOR_TYPE = 1;
        
HitTestResult for hitting a phone number.

/**
         * HitTestResult for hitting a phone number.
         */
        public static final int PHONE_TYPE = 2;
        
HitTestResult for hitting a map address.

/**
         * HitTestResult for hitting a map address.
         */
        public static final int GEO_TYPE = 3;
        
HitTestResult for hitting an email address.

/**
         * HitTestResult for hitting an email address.
         */
        public static final int EMAIL_TYPE = 4;
        
HitTestResult for hitting an HTML::img tag.

/**
         * HitTestResult for hitting an HTML::img tag.
         */
        public static final int IMAGE_TYPE = 5;
        
Deprecated:This type is no longer used.
/**
         * @deprecated This type is no longer used.
         */
        @Deprecated
        public static final int IMAGE_ANCHOR_TYPE = 6;
        
HitTestResult for hitting a HTML::a tag with src=http.

/**
         * HitTestResult for hitting a HTML::a tag with src=http.
         */
        public static final int SRC_ANCHOR_TYPE = 7;
        
HitTestResult for hitting a HTML::a tag with src=http + HTML::img.

/**
         * HitTestResult for hitting a HTML::a tag with src=http + HTML::img.
         */
        public static final int SRC_IMAGE_ANCHOR_TYPE = 8;
        
HitTestResult for hitting an edit text area.

/**
         * HitTestResult for hitting an edit text area.
         */
        public static final int EDIT_TEXT_TYPE = 9;

        private int mType;
        private String mExtra;

        
@hideOnly for use by WebViewProvider implementations
/**
         * @hide Only for use by WebViewProvider implementations
         */
        @SystemApi
        public HitTestResult() {
            mType = UNKNOWN_TYPE;
        }

        
@hideOnly for use by WebViewProvider implementations
/**
         * @hide Only for use by WebViewProvider implementations
         */
        @SystemApi
        public void setType(int type) {
            mType = type;
        }

        
@hideOnly for use by WebViewProvider implementations
/**
         * @hide Only for use by WebViewProvider implementations
         */
        @SystemApi
        public void setExtra(String extra) {
            mExtra = extra;
        }

        
Gets the type of the hit test result. See the XXX_TYPE constants
defined in this class.

Returns:the type of the hit test result
/**
         * Gets the type of the hit test result. See the XXX_TYPE constants
         * defined in this class.
         *
         * @return the type of the hit test result
         */
        public int getType() {
            return mType;
        }

        
Gets additional type-dependant information about the result. See WebView.getHitTestResult() for details. May either be null or contain extra information about this result. 
Returns:additional type-dependant information about the result
/**
         * Gets additional type-dependant information about the result. See
         * {@link WebView#getHitTestResult()} for details. May either be {@code null}
         * or contain extra information about this result.
         *
         * @return additional type-dependant information about the result
         */
        @Nullable
        public String getExtra() {
            return mExtra;
        }
    }

    
Constructs a new WebView with an Activity Context object.

Note: WebView should always be instantiated with an Activity Context.
If instantiated with an Application Context, WebView will be unable to provide several
features, such as JavaScript dialogs and autofill.

Params:
  • context – an Activity Context to access application assets
/**
     * Constructs a new WebView with an Activity Context object.
     *
     * <p class="note"><b>Note:</b> WebView should always be instantiated with an Activity Context.
     * If instantiated with an Application Context, WebView will be unable to provide several
     * features, such as JavaScript dialogs and autofill.
     *
     * @param context an Activity Context to access application assets
     */
    public WebView(Context context) {
        this(context, null);
    }

    
Constructs a new WebView with layout parameters.

Params:
  • context – an Activity Context to access application assets
  • attrs – an AttributeSet passed to our parent
/**
     * Constructs a new WebView with layout parameters.
     *
     * @param context an Activity Context to access application assets
     * @param attrs an AttributeSet passed to our parent
     */
    public WebView(Context context, AttributeSet attrs) {
        this(context, attrs, com.android.internal.R.attr.webViewStyle);
    }

    
Constructs a new WebView with layout parameters and a default style.

Params:
  • context – an Activity Context to access application assets
  • attrs – an AttributeSet passed to our parent
  • defStyleAttr – an attribute in the current theme that contains a
       reference to a style resource that supplies default values for
       the view. Can be 0 to not look for defaults.
/**
     * Constructs a new WebView with layout parameters and a default style.
     *
     * @param context an Activity Context to access application assets
     * @param attrs an AttributeSet passed to our parent
     * @param defStyleAttr an attribute in the current theme that contains a
     *        reference to a style resource that supplies default values for
     *        the view. Can be 0 to not look for defaults.
     */
    public WebView(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    
Constructs a new WebView with layout parameters and a default style.

Params:
  • context – an Activity Context to access application assets
  • attrs – an AttributeSet passed to our parent
  • defStyleAttr – an attribute in the current theme that contains a
       reference to a style resource that supplies default values for
       the view. Can be 0 to not look for defaults.
  • defStyleRes – a resource identifier of a style resource that
       supplies default values for the view, used only if
       defStyleAttr is 0 or can not be found in the theme. Can be 0
       to not look for defaults.
/**
     * Constructs a new WebView with layout parameters and a default style.
     *
     * @param context an Activity Context to access application assets
     * @param attrs an AttributeSet passed to our parent
     * @param defStyleAttr an attribute in the current theme that contains a
     *        reference to a style resource that supplies default values for
     *        the view. Can be 0 to not look for defaults.
     * @param defStyleRes a resource identifier of a style resource that
     *        supplies default values for the view, used only if
     *        defStyleAttr is 0 or can not be found in the theme. Can be 0
     *        to not look for defaults.
     */
    public WebView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        this(context, attrs, defStyleAttr, defStyleRes, null, false);
    }

    
Constructs a new WebView with layout parameters and a default style.

Params:
  • context – an Activity Context to access application assets
  • attrs – an AttributeSet passed to our parent
  • defStyleAttr – an attribute in the current theme that contains a
       reference to a style resource that supplies default values for
       the view. Can be 0 to not look for defaults.
  • privateBrowsing – whether this WebView will be initialized in
                       private mode
Deprecated:Private browsing is no longer supported directly via WebView and will be removed in a future release. Prefer using WebSettings, WebViewDatabase, CookieManager and WebStorage for fine-grained control of privacy data.
/**
     * Constructs a new WebView with layout parameters and a default style.
     *
     * @param context an Activity Context to access application assets
     * @param attrs an AttributeSet passed to our parent
     * @param defStyleAttr an attribute in the current theme that contains a
     *        reference to a style resource that supplies default values for
     *        the view. Can be 0 to not look for defaults.
     * @param privateBrowsing whether this WebView will be initialized in
     *                        private mode
     *
     * @deprecated Private browsing is no longer supported directly via
     * WebView and will be removed in a future release. Prefer using
     * {@link WebSettings}, {@link WebViewDatabase}, {@link CookieManager}
     * and {@link WebStorage} for fine-grained control of privacy data.
     */
    @Deprecated
    public WebView(Context context, AttributeSet attrs, int defStyleAttr,
            boolean privateBrowsing) {
        this(context, attrs, defStyleAttr, 0, null, privateBrowsing);
    }

    
Constructs a new WebView with layout parameters, a default style and a set
of custom JavaScript interfaces to be added to this WebView at initialization
time. This guarantees that these interfaces will be available when the JS
context is initialized.

Params:
  • context – an Activity Context to access application assets
  • attrs – an AttributeSet passed to our parent
  • defStyleAttr – an attribute in the current theme that contains a
       reference to a style resource that supplies default values for
       the view. Can be 0 to not look for defaults.
  • javaScriptInterfaces – a Map of interface names, as keys, and
                            object implementing those interfaces, as
                            values
  • privateBrowsing – whether this WebView will be initialized in
                       private mode
@hideThis is used internally by dumprendertree, as it requires the JavaScript interfaces to
      be added synchronously, before a subsequent loadUrl call takes effect.
/**
     * Constructs a new WebView with layout parameters, a default style and a set
     * of custom JavaScript interfaces to be added to this WebView at initialization
     * time. This guarantees that these interfaces will be available when the JS
     * context is initialized.
     *
     * @param context an Activity Context to access application assets
     * @param attrs an AttributeSet passed to our parent
     * @param defStyleAttr an attribute in the current theme that contains a
     *        reference to a style resource that supplies default values for
     *        the view. Can be 0 to not look for defaults.
     * @param javaScriptInterfaces a Map of interface names, as keys, and
     *                             object implementing those interfaces, as
     *                             values
     * @param privateBrowsing whether this WebView will be initialized in
     *                        private mode
     * @hide This is used internally by dumprendertree, as it requires the JavaScript interfaces to
     *       be added synchronously, before a subsequent loadUrl call takes effect.
     */
    protected WebView(Context context, AttributeSet attrs, int defStyleAttr,
            Map<String, Object> javaScriptInterfaces, boolean privateBrowsing) {
        this(context, attrs, defStyleAttr, 0, javaScriptInterfaces, privateBrowsing);
    }

    
@hide
/**
     * @hide
     */
    @SuppressWarnings("deprecation")  // for super() call into deprecated base class constructor.
    protected WebView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes,
            Map<String, Object> javaScriptInterfaces, boolean privateBrowsing) {
        super(context, attrs, defStyleAttr, defStyleRes);

        // WebView is important by default, unless app developer overrode attribute.
        if (getImportantForAutofill() == IMPORTANT_FOR_AUTOFILL_AUTO) {
            setImportantForAutofill(IMPORTANT_FOR_AUTOFILL_YES);
        }

        if (context == null) {
            throw new IllegalArgumentException("Invalid context argument");
        }
        if (mWebViewThread == null) {
            throw new RuntimeException(
                "WebView cannot be initialized on a thread that has no Looper.");
        }
        sEnforceThreadChecking = context.getApplicationInfo().targetSdkVersion >=
                Build.VERSION_CODES.JELLY_BEAN_MR2;
        checkThread();

        ensureProviderCreated();
        mProvider.init(javaScriptInterfaces, privateBrowsing);
        // Post condition of creating a webview is the CookieSyncManager.getInstance() is allowed.
        CookieSyncManager.setGetInstanceIsAllowed();
    }

    
Specifies whether the horizontal scrollbar has overlay style.

Params:
  • overlay – true if horizontal scrollbar should have overlay style
Deprecated:This method has no effect.
/**
     * Specifies whether the horizontal scrollbar has overlay style.
     *
     * @deprecated This method has no effect.
     * @param overlay {@code true} if horizontal scrollbar should have overlay style
     */
    @Deprecated
    public void setHorizontalScrollbarOverlay(boolean overlay) {
    }

    
Specifies whether the vertical scrollbar has overlay style.

Params:
  • overlay – true if vertical scrollbar should have overlay style
Deprecated:This method has no effect.
/**
     * Specifies whether the vertical scrollbar has overlay style.
     *
     * @deprecated This method has no effect.
     * @param overlay {@code true} if vertical scrollbar should have overlay style
     */
    @Deprecated
    public void setVerticalScrollbarOverlay(boolean overlay) {
    }

    
Gets whether horizontal scrollbar has overlay style.

Deprecated:This method is now obsolete.
Returns:true
/**
     * Gets whether horizontal scrollbar has overlay style.
     *
     * @deprecated This method is now obsolete.
     * @return {@code true}
     */
    @Deprecated
    public boolean overlayHorizontalScrollbar() {
        // The old implementation defaulted to true, so return true for consistency
        return true;
    }

    
Gets whether vertical scrollbar has overlay style.

Deprecated:This method is now obsolete.
Returns:false
/**
     * Gets whether vertical scrollbar has overlay style.
     *
     * @deprecated This method is now obsolete.
     * @return {@code false}
     */
    @Deprecated
    public boolean overlayVerticalScrollbar() {
        // The old implementation defaulted to false, so return false for consistency
        return false;
    }

    
Gets the visible height (in pixels) of the embedded title bar (if any).

Deprecated:This method is now obsolete.
@hideSince API level VERSION_CODES.JELLY_BEAN_MR1
/**
     * Gets the visible height (in pixels) of the embedded title bar (if any).
     *
     * @deprecated This method is now obsolete.
     * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     */
    @Deprecated
    public int getVisibleTitleHeight() {
        checkThread();
        return mProvider.getVisibleTitleHeight();
    }

    
Gets the SSL certificate for the main top-level page or null if there is no certificate (the site is not secure). 
Returns:the SSL certificate for the main top-level page
/**
     * Gets the SSL certificate for the main top-level page or {@code null} if there is
     * no certificate (the site is not secure).
     *
     * @return the SSL certificate for the main top-level page
     */
    @Nullable
    public SslCertificate getCertificate() {
        checkThread();
        return mProvider.getCertificate();
    }

    
Sets the SSL certificate for the main top-level page.

Deprecated:Calling this function has no useful effect, and will be
ignored in future releases.
/**
     * Sets the SSL certificate for the main top-level page.
     *
     * @deprecated Calling this function has no useful effect, and will be
     * ignored in future releases.
     */
    @Deprecated
    public void setCertificate(SslCertificate certificate) {
        checkThread();
        mProvider.setCertificate(certificate);
    }

    //-------------------------------------------------------------------------
    // Methods called by activity
    //-------------------------------------------------------------------------

    
Sets a username and password pair for the specified host. This data is
used by the WebView to autocomplete username and password fields in web
forms. Note that this is unrelated to the credentials used for HTTP
authentication.

Params:
  • host – the host that required the credentials
  • username – the username for the given host
  • password – the password for the given host
See Also:
Deprecated:Saving passwords in WebView will not be supported in future versions.
/**
     * Sets a username and password pair for the specified host. This data is
     * used by the WebView to autocomplete username and password fields in web
     * forms. Note that this is unrelated to the credentials used for HTTP
     * authentication.
     *
     * @param host the host that required the credentials
     * @param username the username for the given host
     * @param password the password for the given host
     * @see WebViewDatabase#clearUsernamePassword
     * @see WebViewDatabase#hasUsernamePassword
     * @deprecated Saving passwords in WebView will not be supported in future versions.
     */
    @Deprecated
    public void savePassword(String host, String username, String password) {
        checkThread();
        mProvider.savePassword(host, username, password);
    }

    
Stores HTTP authentication credentials for a given host and realm to the WebViewDatabase instance. 
Params:
  • host – the host to which the credentials apply
  • realm – the realm to which the credentials apply
  • username – the username
  • password – the password
Deprecated:Use WebViewDatabase.setHttpAuthUsernamePassword instead
/**
     * Stores HTTP authentication credentials for a given host and realm to the {@link WebViewDatabase}
     * instance.
     *
     * @param host the host to which the credentials apply
     * @param realm the realm to which the credentials apply
     * @param username the username
     * @param password the password
     * @deprecated Use {@link WebViewDatabase#setHttpAuthUsernamePassword} instead
     */
    @Deprecated
    public void setHttpAuthUsernamePassword(String host, String realm,
            String username, String password) {
        checkThread();
        mProvider.setHttpAuthUsernamePassword(host, realm, username, password);
    }

    
Retrieves HTTP authentication credentials for a given host and realm from the WebViewDatabase instance. 
Params:
  • host – the host to which the credentials apply
  • realm – the realm to which the credentials apply
Returns:the credentials as a String array, if found. The first element is the username and the second element is the password. null if no credentials are found.
Deprecated:Use WebViewDatabase.getHttpAuthUsernamePassword instead
/**
     * Retrieves HTTP authentication credentials for a given host and realm from the {@link
     * WebViewDatabase} instance.
     * @param host the host to which the credentials apply
     * @param realm the realm to which the credentials apply
     * @return the credentials as a String array, if found. The first element
     *         is the username and the second element is the password. {@code null} if
     *         no credentials are found.
     * @deprecated Use {@link WebViewDatabase#getHttpAuthUsernamePassword} instead
     */
    @Deprecated
    @Nullable
    public String[] getHttpAuthUsernamePassword(String host, String realm) {
        checkThread();
        return mProvider.getHttpAuthUsernamePassword(host, realm);
    }

    
Destroys the internal state of this WebView. This method should be called
after this WebView has been removed from the view system. No other
methods may be called on this WebView after destroy.

/**
     * Destroys the internal state of this WebView. This method should be called
     * after this WebView has been removed from the view system. No other
     * methods may be called on this WebView after destroy.
     */
    public void destroy() {
        checkThread();
        mProvider.destroy();
    }

    
Enables platform notifications of data state and proxy changes.
Notifications are enabled by default.

Deprecated:This method is now obsolete.
@hideSince API level VERSION_CODES.JELLY_BEAN_MR1
/**
     * Enables platform notifications of data state and proxy changes.
     * Notifications are enabled by default.
     *
     * @deprecated This method is now obsolete.
     * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     */
    @Deprecated
    public static void enablePlatformNotifications() {
        // noop
    }

    
Disables platform notifications of data state and proxy changes.
Notifications are enabled by default.

Deprecated:This method is now obsolete.
@hideSince API level VERSION_CODES.JELLY_BEAN_MR1
/**
     * Disables platform notifications of data state and proxy changes.
     * Notifications are enabled by default.
     *
     * @deprecated This method is now obsolete.
     * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     */
    @Deprecated
    public static void disablePlatformNotifications() {
        // noop
    }

    
Used only by internal tests to free up memory.

@hide
/**
     * Used only by internal tests to free up memory.
     *
     * @hide
     */
    public static void freeMemoryForTests() {
        getFactory().getStatics().freeMemoryForTests();
    }

    
Informs WebView of the network state. This is used to set
the JavaScript property window.navigator.isOnline and
generates the online/offline event as specified in HTML5, sec. 5.7.7

Params:
  • networkUp – a boolean indicating if network is available
/**
     * Informs WebView of the network state. This is used to set
     * the JavaScript property window.navigator.isOnline and
     * generates the online/offline event as specified in HTML5, sec. 5.7.7
     *
     * @param networkUp a boolean indicating if network is available
     */
    public void setNetworkAvailable(boolean networkUp) {
        checkThread();
        mProvider.setNetworkAvailable(networkUp);
    }

    
Saves the state of this WebView used in Activity.onSaveInstanceState. Please note that this method no longer stores the display data for this WebView. The previous behavior could potentially leak files if restoreState was never called. 
Params:
  • outState – the Bundle to store this WebView's state
Returns:the same copy of the back/forward list used to save the state, null if the method fails.
/**
     * Saves the state of this WebView used in
     * {@link android.app.Activity#onSaveInstanceState}. Please note that this
     * method no longer stores the display data for this WebView. The previous
     * behavior could potentially leak files if {@link #restoreState} was never
     * called.
     *
     * @param outState the Bundle to store this WebView's state
     * @return the same copy of the back/forward list used to save the state, {@code null} if the
     *         method fails.
     */
    @Nullable
    public WebBackForwardList saveState(Bundle outState) {
        checkThread();
        return mProvider.saveState(outState);
    }

    
Saves the current display data to the Bundle given. Used in conjunction with saveState. 
Params:
  • b – a Bundle to store the display data
  • dest – the file to store the serialized picture data. Will be
            overwritten with this WebView's picture data.
Returns:true if the picture was successfully saved
Deprecated:This method is now obsolete.
@hideSince API level VERSION_CODES.JELLY_BEAN_MR1
/**
     * Saves the current display data to the Bundle given. Used in conjunction
     * with {@link #saveState}.
     * @param b a Bundle to store the display data
     * @param dest the file to store the serialized picture data. Will be
     *             overwritten with this WebView's picture data.
     * @return {@code true} if the picture was successfully saved
     * @deprecated This method is now obsolete.
     * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     */
    @Deprecated
    public boolean savePicture(Bundle b, final File dest) {
        checkThread();
        return mProvider.savePicture(b, dest);
    }

    
Restores the display data that was saved in savePicture. Used in conjunction with restoreState. Note that this will not work if this WebView is hardware accelerated. 
Params:
  • b – a Bundle containing the saved display data
  • src – the file where the picture data was stored
Returns:true if the picture was successfully restored
Deprecated:This method is now obsolete.
@hideSince API level VERSION_CODES.JELLY_BEAN_MR1
/**
     * Restores the display data that was saved in {@link #savePicture}. Used in
     * conjunction with {@link #restoreState}. Note that this will not work if
     * this WebView is hardware accelerated.
     *
     * @param b a Bundle containing the saved display data
     * @param src the file where the picture data was stored
     * @return {@code true} if the picture was successfully restored
     * @deprecated This method is now obsolete.
     * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     */
    @Deprecated
    public boolean restorePicture(Bundle b, File src) {
        checkThread();
        return mProvider.restorePicture(b, src);
    }

    
Restores the state of this WebView from the given Bundle. This method is intended for use in Activity.onRestoreInstanceState and should be called to restore the state of this WebView. If it is called after this WebView has had a chance to build state (load pages, create a back/forward list, etc.) there may be undesirable side-effects. Please note that this method no longer restores the display data for this WebView. 
Params:
  • inState – the incoming Bundle of state
Returns:the restored back/forward list or null if restoreState failed
/**
     * Restores the state of this WebView from the given Bundle. This method is
     * intended for use in {@link android.app.Activity#onRestoreInstanceState}
     * and should be called to restore the state of this WebView. If
     * it is called after this WebView has had a chance to build state (load
     * pages, create a back/forward list, etc.) there may be undesirable
     * side-effects. Please note that this method no longer restores the
     * display data for this WebView.
     *
     * @param inState the incoming Bundle of state
     * @return the restored back/forward list or {@code null} if restoreState failed
     */
    @Nullable
    public WebBackForwardList restoreState(Bundle inState) {
        checkThread();
        return mProvider.restoreState(inState);
    }

    
Loads the given URL with the specified additional HTTP headers.

 Also see compatibility note on evaluateJavascript. 
Params:
  • url – the URL of the resource to load
  • additionalHttpHeaders – the additional headers to be used in the
           HTTP request for this URL, specified as a map from name to
           value. Note that if this map contains any of the headers
           that are set by default by this WebView, such as those
           controlling caching, accept types or the User-Agent, their
           values may be overridden by this WebView's defaults.
/**
     * Loads the given URL with the specified additional HTTP headers.
     * <p>
     * Also see compatibility note on {@link #evaluateJavascript}.
     *
     * @param url the URL of the resource to load
     * @param additionalHttpHeaders the additional headers to be used in the
     *            HTTP request for this URL, specified as a map from name to
     *            value. Note that if this map contains any of the headers
     *            that are set by default by this WebView, such as those
     *            controlling caching, accept types or the User-Agent, their
     *            values may be overridden by this WebView's defaults.
     */
    public void loadUrl(String url, Map<String, String> additionalHttpHeaders) {
        checkThread();
        mProvider.loadUrl(url, additionalHttpHeaders);
    }

    
Loads the given URL.

 Also see compatibility note on evaluateJavascript. 
Params:
  • url – the URL of the resource to load
/**
     * Loads the given URL.
     * <p>
     * Also see compatibility note on {@link #evaluateJavascript}.
     *
     * @param url the URL of the resource to load
     */
    public void loadUrl(String url) {
        checkThread();
        mProvider.loadUrl(url);
    }

    
Loads the URL with postData using "POST" method into this WebView. If url is not a network URL, it will be loaded with loadUrl(String) instead, ignoring the postData param. 
Params:
  • url – the URL of the resource to load
  • postData – the data will be passed to "POST" request, which must be
    be "application/x-www-form-urlencoded" encoded.
/**
     * Loads the URL with postData using "POST" method into this WebView. If url
     * is not a network URL, it will be loaded with {@link #loadUrl(String)}
     * instead, ignoring the postData param.
     *
     * @param url the URL of the resource to load
     * @param postData the data will be passed to "POST" request, which must be
     *     be "application/x-www-form-urlencoded" encoded.
     */
    public void postUrl(String url, byte[] postData) {
        checkThread();
        if (URLUtil.isNetworkUrl(url)) {
            mProvider.postUrl(url, postData);
        } else {
            mProvider.loadUrl(url);
        }
    }

    
Loads the given data into this WebView using a 'data' scheme URL.

 Note that JavaScript's same origin policy means that script running in a page loaded using this method will be unable to access content loaded using any scheme other than 'data', including 'http(s)'. To avoid this restriction, use 
loadDataWithBaseURL() with an appropriate base URL. 
 The encoding parameter specifies whether the data is base64 or URL encoded. If the data is base64 encoded, the value of the encoding parameter must be 'base64'. HTML can be encoded with Base64.encodeToString(byte[], int) like so: 
String unencodedHtml =
    "<html><body>'%28' is the code for '('</body></html>";
String encodedHtml = Base64.encodeToString(unencodedHtml.getBytes(), Base64.NO_PADDING);
webView.loadData(encodedHtml, "text/html", "base64");



 For all other values of encoding (including null) it is assumed that the data uses ASCII encoding for octets inside the range of safe URL characters and use the standard %xx hex encoding of URLs for octets outside that range. See RFC 3986 for more information.

 The mimeType parameter specifies the format of the data. If WebView can't handle the specified MIME type, it will download the data. If null, defaults to 'text/html'. 
 The 'data' scheme URL formed by this method uses the default US-ASCII charset. If you need to set a different charset, you should form a 'data' scheme URL which explicitly specifies a charset parameter in the mediatype portion of the URL and call loadUrl(String) instead. Note that the charset obtained from the mediatype portion of a data URL always overrides that specified in the HTML or XML document itself. 
 Content loaded using this method will have a window.origin value of "null". This must not be considered to be a trusted origin by the application or by any JavaScript code running inside the WebView (for example, event sources in DOM event handlers or web messages), because malicious content can also create frames with a null origin. If you need to identify the main frame's origin in a trustworthy way, you should use 
loadDataWithBaseURL() with a valid HTTP or HTTPS base URL to set the origin. 
Params:
  • data – a String of data in the given encoding
  • mimeType – the MIME type of the data, e.g. 'text/html'.
  • encoding – the encoding of the data
/**
     * Loads the given data into this WebView using a 'data' scheme URL.
     * <p>
     * Note that JavaScript's same origin policy means that script running in a
     * page loaded using this method will be unable to access content loaded
     * using any scheme other than 'data', including 'http(s)'. To avoid this
     * restriction, use {@link
     * #loadDataWithBaseURL(String,String,String,String,String)
     * loadDataWithBaseURL()} with an appropriate base URL.
     * <p>
     * The {@code encoding} parameter specifies whether the data is base64 or URL
     * encoded. If the data is base64 encoded, the value of the encoding
     * parameter must be 'base64'. HTML can be encoded with {@link
     * android.util.Base64#encodeToString(byte[],int)} like so:
     * <pre>
     * String unencodedHtml =
     *     "&lt;html&gt;&lt;body&gt;'%28' is the code for '('&lt;/body&gt;&lt;/html&gt;";
     * String encodedHtml = Base64.encodeToString(unencodedHtml.getBytes(), Base64.NO_PADDING);
     * webView.loadData(encodedHtml, "text/html", "base64");
     * </pre>
     * <p>
     * For all other values of {@code encoding} (including {@code null}) it is assumed that the
     * data uses ASCII encoding for octets inside the range of safe URL characters and use the
     * standard %xx hex encoding of URLs for octets outside that range. See <a
     * href="https://tools.ietf.org/html/rfc3986#section-2.2">RFC 3986</a> for more information.
     * <p>
     * The {@code mimeType} parameter specifies the format of the data.
     * If WebView can't handle the specified MIME type, it will download the data.
     * If {@code null}, defaults to 'text/html'.
     * <p>
     * The 'data' scheme URL formed by this method uses the default US-ASCII
     * charset. If you need to set a different charset, you should form a
     * 'data' scheme URL which explicitly specifies a charset parameter in the
     * mediatype portion of the URL and call {@link #loadUrl(String)} instead.
     * Note that the charset obtained from the mediatype portion of a data URL
     * always overrides that specified in the HTML or XML document itself.
     * <p>
     * Content loaded using this method will have a {@code window.origin} value
     * of {@code "null"}. This must not be considered to be a trusted origin
     * by the application or by any JavaScript code running inside the WebView
     * (for example, event sources in DOM event handlers or web messages),
     * because malicious content can also create frames with a null origin. If
     * you need to identify the main frame's origin in a trustworthy way, you
     * should use {@link #loadDataWithBaseURL(String,String,String,String,String)
     * loadDataWithBaseURL()} with a valid HTTP or HTTPS base URL to set the
     * origin.
     *
     * @param data a String of data in the given encoding
     * @param mimeType the MIME type of the data, e.g. 'text/html'.
     * @param encoding the encoding of the data
     */
    public void loadData(String data, @Nullable String mimeType, @Nullable String encoding) {
        checkThread();
        mProvider.loadData(data, mimeType, encoding);
    }

    
Loads the given data into this WebView, using baseUrl as the base URL for
the content. The base URL is used both to resolve relative URLs and when
applying JavaScript's same origin policy. The historyUrl is used for the
history entry.

 The mimeType parameter specifies the format of the data. If WebView can't handle the specified MIME type, it will download the data. If null, defaults to 'text/html'. 

Note that content specified in this way can access local device files
(via 'file' scheme URLs) only if baseUrl specifies a scheme other than
'http', 'https', 'ftp', 'ftps', 'about' or 'javascript'.

 If the base URL uses the data scheme, this method is equivalent to calling loadData() and the historyUrl is ignored, and the data will be treated as part of a data: URL. If the base URL uses any other scheme, then the data will be loaded into the WebView as a plain string (i.e. not part of a data URL) and any URL-encoded entities in the string will not be decoded. 

Note that the baseUrl is sent in the 'Referer' HTTP header when
requesting subresources (images, etc.) of the page loaded using this method.

 If a valid HTTP or HTTPS base URL is not specified in baseUrl, then content loaded using this method will have a window.origin value of "null". This must not be considered to be a trusted origin by the application or by any JavaScript code running inside the WebView (for example, event sources in DOM event handlers or web messages), because malicious content can also create frames with a null origin. If you need to identify the main frame's origin in a trustworthy way, you should use a valid HTTP or HTTPS base URL to set the origin. 
Params:
  • baseUrl – the URL to use as the page's base URL. If null defaults to 'about:blank'.
  • data – a String of data in the given encoding
  • mimeType – the MIME type of the data, e.g. 'text/html'.
  • encoding – the encoding of the data
  • historyUrl – the URL to use as the history entry. If null defaults to 'about:blank'. If non-null, this must be a valid URL.
/**
     * Loads the given data into this WebView, using baseUrl as the base URL for
     * the content. The base URL is used both to resolve relative URLs and when
     * applying JavaScript's same origin policy. The historyUrl is used for the
     * history entry.
     * <p>
     * The {@code mimeType} parameter specifies the format of the data.
     * If WebView can't handle the specified MIME type, it will download the data.
     * If {@code null}, defaults to 'text/html'.
     * <p>
     * Note that content specified in this way can access local device files
     * (via 'file' scheme URLs) only if baseUrl specifies a scheme other than
     * 'http', 'https', 'ftp', 'ftps', 'about' or 'javascript'.
     * <p>
     * If the base URL uses the data scheme, this method is equivalent to
     * calling {@link #loadData(String,String,String) loadData()} and the
     * historyUrl is ignored, and the data will be treated as part of a data: URL.
     * If the base URL uses any other scheme, then the data will be loaded into
     * the WebView as a plain string (i.e. not part of a data URL) and any URL-encoded
     * entities in the string will not be decoded.
     * <p>
     * Note that the baseUrl is sent in the 'Referer' HTTP header when
     * requesting subresources (images, etc.) of the page loaded using this method.
     * <p>
     * If a valid HTTP or HTTPS base URL is not specified in {@code baseUrl}, then
     * content loaded using this method will have a {@code window.origin} value
     * of {@code "null"}. This must not be considered to be a trusted origin
     * by the application or by any JavaScript code running inside the WebView
     * (for example, event sources in DOM event handlers or web messages),
     * because malicious content can also create frames with a null origin. If
     * you need to identify the main frame's origin in a trustworthy way, you
     * should use a valid HTTP or HTTPS base URL to set the origin.
     *
     * @param baseUrl the URL to use as the page's base URL. If {@code null} defaults to
     *                'about:blank'.
     * @param data a String of data in the given encoding
     * @param mimeType the MIME type of the data, e.g. 'text/html'.
     * @param encoding the encoding of the data
     * @param historyUrl the URL to use as the history entry. If {@code null} defaults
     *                   to 'about:blank'. If non-null, this must be a valid URL.
     */
    public void loadDataWithBaseURL(@Nullable String baseUrl, String data,
            @Nullable String mimeType, @Nullable String encoding, @Nullable String historyUrl) {
        checkThread();
        mProvider.loadDataWithBaseURL(baseUrl, data, mimeType, encoding, historyUrl);
    }

    
Asynchronously evaluates JavaScript in the context of the currently displayed page.
If non-null, |resultCallback| will be invoked with any result returned from that
execution. This method must be called on the UI thread and the callback will
be made on the UI thread.

 Compatibility note. Applications targeting VERSION_CODES.N or later, JavaScript state from an empty WebView is no longer persisted across navigations like loadUrl(String). For example, global variables and functions defined before calling loadUrl(String) will not exist in the loaded page. Applications should use addJavascriptInterface instead to persist JavaScript objects across navigations. 
Params:
  • script – the JavaScript to execute.
  • resultCallback – A callback to be invoked when the script execution completes with the result of the execution (if any). May be null if no notification of the result is required.
/**
     * Asynchronously evaluates JavaScript in the context of the currently displayed page.
     * If non-null, |resultCallback| will be invoked with any result returned from that
     * execution. This method must be called on the UI thread and the callback will
     * be made on the UI thread.
     * <p>
     * Compatibility note. Applications targeting {@link android.os.Build.VERSION_CODES#N} or
     * later, JavaScript state from an empty WebView is no longer persisted across navigations like
     * {@link #loadUrl(String)}. For example, global variables and functions defined before calling
     * {@link #loadUrl(String)} will not exist in the loaded page. Applications should use
     * {@link #addJavascriptInterface} instead to persist JavaScript objects across navigations.
     *
     * @param script the JavaScript to execute.
     * @param resultCallback A callback to be invoked when the script execution
     *                       completes with the result of the execution (if any).
     *                       May be {@code null} if no notification of the result is required.
     */
    public void evaluateJavascript(String script, @Nullable ValueCallback<String> resultCallback) {
        checkThread();
        mProvider.evaluateJavaScript(script, resultCallback);
    }

    
Saves the current view as a web archive.

Params:
  • filename – the filename where the archive should be placed
/**
     * Saves the current view as a web archive.
     *
     * @param filename the filename where the archive should be placed
     */
    public void saveWebArchive(String filename) {
        checkThread();
        mProvider.saveWebArchive(filename);
    }

    
Saves the current view as a web archive.

Params:
  • basename – the filename where the archive should be placed
  • autoname – if false, takes basename to be a file. If true, basename is assumed to be a directory in which a filename will be chosen according to the URL of the current page.
  • callback – called after the web archive has been saved. The parameter for onReceiveValue will either be the filename under which the file was saved, or null if saving the file failed.
/**
     * Saves the current view as a web archive.
     *
     * @param basename the filename where the archive should be placed
     * @param autoname if {@code false}, takes basename to be a file. If {@code true}, basename
     *                 is assumed to be a directory in which a filename will be
     *                 chosen according to the URL of the current page.
     * @param callback called after the web archive has been saved. The
     *                 parameter for onReceiveValue will either be the filename
     *                 under which the file was saved, or {@code null} if saving the
     *                 file failed.
     */
    public void saveWebArchive(String basename, boolean autoname, @Nullable ValueCallback<String>
            callback) {
        checkThread();
        mProvider.saveWebArchive(basename, autoname, callback);
    }

    
Stops the current load.

/**
     * Stops the current load.
     */
    public void stopLoading() {
        checkThread();
        mProvider.stopLoading();
    }

    
Reloads the current URL.

/**
     * Reloads the current URL.
     */
    public void reload() {
        checkThread();
        mProvider.reload();
    }

    
Gets whether this WebView has a back history item.

Returns:true if this WebView has a back history item
/**
     * Gets whether this WebView has a back history item.
     *
     * @return {@code true} if this WebView has a back history item
     */
    public boolean canGoBack() {
        checkThread();
        return mProvider.canGoBack();
    }

    
Goes back in the history of this WebView.

/**
     * Goes back in the history of this WebView.
     */
    public void goBack() {
        checkThread();
        mProvider.goBack();
    }

    
Gets whether this WebView has a forward history item.

Returns:true if this WebView has a forward history item
/**
     * Gets whether this WebView has a forward history item.
     *
     * @return {@code true} if this WebView has a forward history item
     */
    public boolean canGoForward() {
        checkThread();
        return mProvider.canGoForward();
    }

    
Goes forward in the history of this WebView.

/**
     * Goes forward in the history of this WebView.
     */
    public void goForward() {
        checkThread();
        mProvider.goForward();
    }

    
Gets whether the page can go back or forward the given
number of steps.

Params:
  • steps – the negative or positive number of steps to move the
             history
/**
     * Gets whether the page can go back or forward the given
     * number of steps.
     *
     * @param steps the negative or positive number of steps to move the
     *              history
     */
    public boolean canGoBackOrForward(int steps) {
        checkThread();
        return mProvider.canGoBackOrForward(steps);
    }

    
Goes to the history item that is the number of steps away from
the current item. Steps is negative if backward and positive
if forward.

Params:
  • steps – the number of steps to take back or forward in the back
             forward list
/**
     * Goes to the history item that is the number of steps away from
     * the current item. Steps is negative if backward and positive
     * if forward.
     *
     * @param steps the number of steps to take back or forward in the back
     *              forward list
     */
    public void goBackOrForward(int steps) {
        checkThread();
        mProvider.goBackOrForward(steps);
    }

    
Gets whether private browsing is enabled in this WebView.

/**
     * Gets whether private browsing is enabled in this WebView.
     */
    public boolean isPrivateBrowsingEnabled() {
        checkThread();
        return mProvider.isPrivateBrowsingEnabled();
    }

    
Scrolls the contents of this WebView up by half the view size.

Params:
  • top – true to jump to the top of the page
Returns:true if the page was scrolled
/**
     * Scrolls the contents of this WebView up by half the view size.
     *
     * @param top {@code true} to jump to the top of the page
     * @return {@code true} if the page was scrolled
     */
    public boolean pageUp(boolean top) {
        checkThread();
        return mProvider.pageUp(top);
    }

    
Scrolls the contents of this WebView down by half the page size.

Params:
  • bottom – true to jump to bottom of page
Returns:true if the page was scrolled
/**
     * Scrolls the contents of this WebView down by half the page size.
     *
     * @param bottom {@code true} to jump to bottom of page
     * @return {@code true} if the page was scrolled
     */
    public boolean pageDown(boolean bottom) {
        checkThread();
        return mProvider.pageDown(bottom);
    }

    
Posts a VisualStateCallback, which will be called when the current state of the WebView is ready to be drawn. 
Because updates to the DOM are processed asynchronously, updates to the DOM may not immediately be reflected visually by subsequent onDraw invocations. The VisualStateCallback provides a mechanism to notify the caller when the contents of the DOM at the current time are ready to be drawn the next time the WebView draws. 
The next draw after the callback completes is guaranteed to reflect all the updates to the DOM up to the point at which the VisualStateCallback was posted, but it may also contain updates applied after the callback was posted. 
The state of the DOM covered by this API includes the following:

    

  • primitive HTML elements (div, img, span, etc..)
    • 

  • images
    • 

  • CSS animations
    • 

  • WebGL
    • 

  • canvas
    • 


It does not include the state of:

    

  • the video tag
    • 



To guarantee that the WebView will successfully render the first frame after the VisualStateCallback.onComplete method has been called a set of conditions must be met: 


When using this API it is also recommended to enable pre-rasterization if the WebView is off screen to avoid flickering. See WebSettings.setOffscreenPreRaster for more details and do consider its caveats. 
Params:
  • requestId – An id that will be returned in the callback to allow callers to match
                 requests with callbacks.
  • callback –  The callback to be invoked.
/**
     * Posts a {@link VisualStateCallback}, which will be called when
     * the current state of the WebView is ready to be drawn.
     *
     * <p>Because updates to the DOM are processed asynchronously, updates to the DOM may not
     * immediately be reflected visually by subsequent {@link WebView#onDraw} invocations. The
     * {@link VisualStateCallback} provides a mechanism to notify the caller when the contents of
     * the DOM at the current time are ready to be drawn the next time the {@link WebView}
     * draws.
     *
     * <p>The next draw after the callback completes is guaranteed to reflect all the updates to the
     * DOM up to the point at which the {@link VisualStateCallback} was posted, but it may also
     * contain updates applied after the callback was posted.
     *
     * <p>The state of the DOM covered by this API includes the following:
     * <ul>
     * <li>primitive HTML elements (div, img, span, etc..)</li>
     * <li>images</li>
     * <li>CSS animations</li>
     * <li>WebGL</li>
     * <li>canvas</li>
     * </ul>
     * It does not include the state of:
     * <ul>
     * <li>the video tag</li>
     * </ul>
     *
     * <p>To guarantee that the {@link WebView} will successfully render the first frame
     * after the {@link VisualStateCallback#onComplete} method has been called a set of conditions
     * must be met:
     * <ul>
     * <li>If the {@link WebView}'s visibility is set to {@link View#VISIBLE VISIBLE} then
     * the {@link WebView} must be attached to the view hierarchy.</li>
     * <li>If the {@link WebView}'s visibility is set to {@link View#INVISIBLE INVISIBLE}
     * then the {@link WebView} must be attached to the view hierarchy and must be made
     * {@link View#VISIBLE VISIBLE} from the {@link VisualStateCallback#onComplete} method.</li>
     * <li>If the {@link WebView}'s visibility is set to {@link View#GONE GONE} then the
     * {@link WebView} must be attached to the view hierarchy and its
     * {@link AbsoluteLayout.LayoutParams LayoutParams}'s width and height need to be set to fixed
     * values and must be made {@link View#VISIBLE VISIBLE} from the
     * {@link VisualStateCallback#onComplete} method.</li>
     * </ul>
     *
     * <p>When using this API it is also recommended to enable pre-rasterization if the {@link
     * WebView} is off screen to avoid flickering. See {@link WebSettings#setOffscreenPreRaster} for
     * more details and do consider its caveats.
     *
     * @param requestId An id that will be returned in the callback to allow callers to match
     *                  requests with callbacks.
     * @param callback  The callback to be invoked.
     */
    public void postVisualStateCallback(long requestId, VisualStateCallback callback) {
        checkThread();
        mProvider.insertVisualStateCallback(requestId, callback);
    }

    
Clears this WebView so that onDraw() will draw nothing but white background,
and onMeasure() will return 0 if MeasureSpec is not MeasureSpec.EXACTLY.

Deprecated:Use WebView.loadUrl("about:blank") to reliably reset the view state
            and release page resources (including any running JavaScript).
/**
     * Clears this WebView so that onDraw() will draw nothing but white background,
     * and onMeasure() will return 0 if MeasureSpec is not MeasureSpec.EXACTLY.
     * @deprecated Use WebView.loadUrl("about:blank") to reliably reset the view state
     *             and release page resources (including any running JavaScript).
     */
    @Deprecated
    public void clearView() {
        checkThread();
        mProvider.clearView();
    }

    
Gets a new picture that captures the current contents of this WebView.
The picture is of the entire document being displayed, and is not
limited to the area currently displayed by this WebView. Also, the
picture is a static copy and is unaffected by later changes to the
content being displayed.

 Note that due to internal changes, for API levels between VERSION_CODES.HONEYCOMB and VERSION_CODES.ICE_CREAM_SANDWICH inclusive, the picture does not include fixed position elements or scrollable divs. 
 Note that from VERSION_CODES.JELLY_BEAN_MR1 the returned picture should only be drawn into bitmap-backed Canvas - using any other type of Canvas will involve additional conversion at a cost in memory and performance. Also the Picture.createFromStream and Picture.writeToStream methods are not supported on the returned object. 
Deprecated:Use onDraw to obtain a bitmap snapshot of the WebView, or saveWebArchive to save the content to a file.
Returns:a picture that captures the current contents of this WebView
/**
     * Gets a new picture that captures the current contents of this WebView.
     * The picture is of the entire document being displayed, and is not
     * limited to the area currently displayed by this WebView. Also, the
     * picture is a static copy and is unaffected by later changes to the
     * content being displayed.
     * <p>
     * Note that due to internal changes, for API levels between
     * {@link android.os.Build.VERSION_CODES#HONEYCOMB} and
     * {@link android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH} inclusive, the
     * picture does not include fixed position elements or scrollable divs.
     * <p>
     * Note that from {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1} the returned picture
     * should only be drawn into bitmap-backed Canvas - using any other type of Canvas will involve
     * additional conversion at a cost in memory and performance. Also the
     * {@link android.graphics.Picture#createFromStream} and
     * {@link android.graphics.Picture#writeToStream} methods are not supported on the
     * returned object.
     *
     * @deprecated Use {@link #onDraw} to obtain a bitmap snapshot of the WebView, or
     * {@link #saveWebArchive} to save the content to a file.
     *
     * @return a picture that captures the current contents of this WebView
     */
    @Deprecated
    public Picture capturePicture() {
        checkThread();
        return mProvider.capturePicture();
    }

    
Deprecated:Use createPrintDocumentAdapter(String) which requires user to provide a print document name.
/**
     * @deprecated Use {@link #createPrintDocumentAdapter(String)} which requires user
     *             to provide a print document name.
     */
    @Deprecated
    public PrintDocumentAdapter createPrintDocumentAdapter() {
        checkThread();
        return mProvider.createPrintDocumentAdapter("default");
    }

    
Creates a PrintDocumentAdapter that provides the content of this WebView for printing. The adapter works by converting the WebView contents to a PDF stream. The WebView cannot be drawn during the conversion process - any such draws are undefined. It is recommended to use a dedicated off screen WebView for the printing. If necessary, an application may temporarily hide a visible WebView by using a custom PrintDocumentAdapter instance wrapped around the object returned and observing the onStart and onFinish methods. See PrintDocumentAdapter for more information. 
Params:
/**
     * Creates a PrintDocumentAdapter that provides the content of this WebView for printing.
     *
     * The adapter works by converting the WebView contents to a PDF stream. The WebView cannot
     * be drawn during the conversion process - any such draws are undefined. It is recommended
     * to use a dedicated off screen WebView for the printing. If necessary, an application may
     * temporarily hide a visible WebView by using a custom PrintDocumentAdapter instance
     * wrapped around the object returned and observing the onStart and onFinish methods. See
     * {@link android.print.PrintDocumentAdapter} for more information.
     *
     * @param documentName  The user-facing name of the printed document. See
     *                      {@link android.print.PrintDocumentInfo}
     */
    public PrintDocumentAdapter createPrintDocumentAdapter(String documentName) {
        checkThread();
        return mProvider.createPrintDocumentAdapter(documentName);
    }

    
Gets the current scale of this WebView.

Returns:the current scale
Deprecated:This method is prone to inaccuracy due to race conditions between the web rendering and UI threads; prefer WebViewClient.onScaleChanged.
/**
     * Gets the current scale of this WebView.
     *
     * @return the current scale
     *
     * @deprecated This method is prone to inaccuracy due to race conditions
     * between the web rendering and UI threads; prefer
     * {@link WebViewClient#onScaleChanged}.
     */
    @Deprecated
    @ViewDebug.ExportedProperty(category = "webview")
    public float getScale() {
        checkThread();
        return mProvider.getScale();
    }

    
Sets the initial scale for this WebView. 0 means default. The behavior for the default scale depends on the state of WebSettings.getUseWideViewPort() and WebSettings.getLoadWithOverviewMode(). If the content fits into the WebView control by width, then the zoom is set to 100%. For wide content, the behavior depends on the state of WebSettings.getLoadWithOverviewMode(). If its value is true, the content will be zoomed out to be fit by width into the WebView control, otherwise not. If initial scale is greater than 0, WebView starts with this value as initial scale. Please note that unlike the scale properties in the viewport meta tag, this method doesn't take the screen density into account. 
Params:
  • scaleInPercent – the initial scale in percent
/**
     * Sets the initial scale for this WebView. 0 means default.
     * The behavior for the default scale depends on the state of
     * {@link WebSettings#getUseWideViewPort()} and
     * {@link WebSettings#getLoadWithOverviewMode()}.
     * If the content fits into the WebView control by width, then
     * the zoom is set to 100%. For wide content, the behavior
     * depends on the state of {@link WebSettings#getLoadWithOverviewMode()}.
     * If its value is {@code true}, the content will be zoomed out to be fit
     * by width into the WebView control, otherwise not.
     *
     * If initial scale is greater than 0, WebView starts with this value
     * as initial scale.
     * Please note that unlike the scale properties in the viewport meta tag,
     * this method doesn't take the screen density into account.
     *
     * @param scaleInPercent the initial scale in percent
     */
    public void setInitialScale(int scaleInPercent) {
        checkThread();
        mProvider.setInitialScale(scaleInPercent);
    }

    
Invokes the graphical zoom picker widget for this WebView. This will
result in the zoom widget appearing on the screen to control the zoom
level of this WebView.

/**
     * Invokes the graphical zoom picker widget for this WebView. This will
     * result in the zoom widget appearing on the screen to control the zoom
     * level of this WebView.
     */
    public void invokeZoomPicker() {
        checkThread();
        mProvider.invokeZoomPicker();
    }

    
Gets a HitTestResult based on the current cursor node. If a HTML::a tag is found and the anchor has a non-JavaScript URL, the HitTestResult type is set to SRC_ANCHOR_TYPE and the URL is set in the "extra" field. If the anchor does not have a URL or if it is a JavaScript URL, the type will be UNKNOWN_TYPE and the URL has to be retrieved through requestFocusNodeHref asynchronously. If a HTML::img tag is found, the HitTestResult type is set to IMAGE_TYPE and the URL is set in the "extra" field. A type of SRC_IMAGE_ANCHOR_TYPE indicates an anchor with a URL that has an image as a child node. If a phone number is found, the HitTestResult type is set to PHONE_TYPE and the phone number is set in the "extra" field of HitTestResult. If a map address is found, the HitTestResult type is set to GEO_TYPE and the address is set in the "extra" field of HitTestResult. If an email address is found, the HitTestResult type is set to EMAIL_TYPE and the email is set in the "extra" field of HitTestResult. Otherwise, HitTestResult type is set to UNKNOWN_TYPE. 
/**
     * Gets a HitTestResult based on the current cursor node. If a HTML::a
     * tag is found and the anchor has a non-JavaScript URL, the HitTestResult
     * type is set to SRC_ANCHOR_TYPE and the URL is set in the "extra" field.
     * If the anchor does not have a URL or if it is a JavaScript URL, the type
     * will be UNKNOWN_TYPE and the URL has to be retrieved through
     * {@link #requestFocusNodeHref} asynchronously. If a HTML::img tag is
     * found, the HitTestResult type is set to IMAGE_TYPE and the URL is set in
     * the "extra" field. A type of
     * SRC_IMAGE_ANCHOR_TYPE indicates an anchor with a URL that has an image as
     * a child node. If a phone number is found, the HitTestResult type is set
     * to PHONE_TYPE and the phone number is set in the "extra" field of
     * HitTestResult. If a map address is found, the HitTestResult type is set
     * to GEO_TYPE and the address is set in the "extra" field of HitTestResult.
     * If an email address is found, the HitTestResult type is set to EMAIL_TYPE
     * and the email is set in the "extra" field of HitTestResult. Otherwise,
     * HitTestResult type is set to UNKNOWN_TYPE.
     */
    public HitTestResult getHitTestResult() {
        checkThread();
        return mProvider.getHitTestResult();
    }

    
Requests the anchor or image element URL at the last tapped point. If hrefMsg is null, this method returns immediately and does not dispatch hrefMsg to its target. If the tapped point hits an image, an anchor, or an image in an anchor, the message associates strings in named keys in its data. The value paired with the key may be an empty string. 
Params:
  • hrefMsg – the message to be dispatched with the result of the
               request. The message data contains three keys. "url"
               returns the anchor's href attribute. "title" returns the
               anchor's text. "src" returns the image's src attribute.
/**
     * Requests the anchor or image element URL at the last tapped point.
     * If hrefMsg is {@code null}, this method returns immediately and does not
     * dispatch hrefMsg to its target. If the tapped point hits an image,
     * an anchor, or an image in an anchor, the message associates
     * strings in named keys in its data. The value paired with the key
     * may be an empty string.
     *
     * @param hrefMsg the message to be dispatched with the result of the
     *                request. The message data contains three keys. "url"
     *                returns the anchor's href attribute. "title" returns the
     *                anchor's text. "src" returns the image's src attribute.
     */
    public void requestFocusNodeHref(@Nullable Message hrefMsg) {
        checkThread();
        mProvider.requestFocusNodeHref(hrefMsg);
    }

    
Requests the URL of the image last touched by the user. msg will be sent
to its target with a String representing the URL as its object.

Params:
  • msg – the message to be dispatched with the result of the request as the data member with "url" as key. The result can be null.
/**
     * Requests the URL of the image last touched by the user. msg will be sent
     * to its target with a String representing the URL as its object.
     *
     * @param msg the message to be dispatched with the result of the request
     *            as the data member with "url" as key. The result can be {@code null}.
     */
    public void requestImageRef(Message msg) {
        checkThread();
        mProvider.requestImageRef(msg);
    }

    
Gets the URL for the current page. This is not always the same as the URL
passed to WebViewClient.onPageStarted because although the load for
that URL has begun, the current page may not have changed.

Returns:the URL for the current page
/**
     * Gets the URL for the current page. This is not always the same as the URL
     * passed to WebViewClient.onPageStarted because although the load for
     * that URL has begun, the current page may not have changed.
     *
     * @return the URL for the current page
     */
    @ViewDebug.ExportedProperty(category = "webview")
    public String getUrl() {
        checkThread();
        return mProvider.getUrl();
    }

    
Gets the original URL for the current page. This is not always the same
as the URL passed to WebViewClient.onPageStarted because although the
load for that URL has begun, the current page may not have changed.
Also, there may have been redirects resulting in a different URL to that
originally requested.

Returns:the URL that was originally requested for the current page
/**
     * Gets the original URL for the current page. This is not always the same
     * as the URL passed to WebViewClient.onPageStarted because although the
     * load for that URL has begun, the current page may not have changed.
     * Also, there may have been redirects resulting in a different URL to that
     * originally requested.
     *
     * @return the URL that was originally requested for the current page
     */
    @ViewDebug.ExportedProperty(category = "webview")
    public String getOriginalUrl() {
        checkThread();
        return mProvider.getOriginalUrl();
    }

    
Gets the title for the current page. This is the title of the current page
until WebViewClient.onReceivedTitle is called.

Returns:the title for the current page
/**
     * Gets the title for the current page. This is the title of the current page
     * until WebViewClient.onReceivedTitle is called.
     *
     * @return the title for the current page
     */
    @ViewDebug.ExportedProperty(category = "webview")
    public String getTitle() {
        checkThread();
        return mProvider.getTitle();
    }

    
Gets the favicon for the current page. This is the favicon of the current
page until WebViewClient.onReceivedIcon is called.

Returns:the favicon for the current page
/**
     * Gets the favicon for the current page. This is the favicon of the current
     * page until WebViewClient.onReceivedIcon is called.
     *
     * @return the favicon for the current page
     */
    public Bitmap getFavicon() {
        checkThread();
        return mProvider.getFavicon();
    }

    
Gets the touch icon URL for the apple-touch-icon  element, or
a URL on this site's server pointing to the standard location of a
touch icon.

@hide
/**
     * Gets the touch icon URL for the apple-touch-icon <link> element, or
     * a URL on this site's server pointing to the standard location of a
     * touch icon.
     *
     * @hide
     */
    public String getTouchIconUrl() {
        return mProvider.getTouchIconUrl();
    }

    
Gets the progress for the current page.

Returns:the progress for the current page between 0 and 100
/**
     * Gets the progress for the current page.
     *
     * @return the progress for the current page between 0 and 100
     */
    public int getProgress() {
        checkThread();
        return mProvider.getProgress();
    }

    
Gets the height of the HTML content.

Returns:the height of the HTML content
/**
     * Gets the height of the HTML content.
     *
     * @return the height of the HTML content
     */
    @ViewDebug.ExportedProperty(category = "webview")
    public int getContentHeight() {
        checkThread();
        return mProvider.getContentHeight();
    }

    
Gets the width of the HTML content.

Returns:the width of the HTML content
@hide
/**
     * Gets the width of the HTML content.
     *
     * @return the width of the HTML content
     * @hide
     */
    @ViewDebug.ExportedProperty(category = "webview")
    public int getContentWidth() {
        return mProvider.getContentWidth();
    }

    
Pauses all layout, parsing, and JavaScript timers for all WebViews. This
is a global requests, not restricted to just this WebView. This can be
useful if the application has been paused.

/**
     * Pauses all layout, parsing, and JavaScript timers for all WebViews. This
     * is a global requests, not restricted to just this WebView. This can be
     * useful if the application has been paused.
     */
    public void pauseTimers() {
        checkThread();
        mProvider.pauseTimers();
    }

    
Resumes all layout, parsing, and JavaScript timers for all WebViews.
This will resume dispatching all timers.

/**
     * Resumes all layout, parsing, and JavaScript timers for all WebViews.
     * This will resume dispatching all timers.
     */
    public void resumeTimers() {
        checkThread();
        mProvider.resumeTimers();
    }

    
Does a best-effort attempt to pause any processing that can be paused safely, such as animations and geolocation. Note that this call does not pause JavaScript. To pause JavaScript globally, use pauseTimers. To resume WebView, call onResume. 
/**
     * Does a best-effort attempt to pause any processing that can be paused
     * safely, such as animations and geolocation. Note that this call
     * does not pause JavaScript. To pause JavaScript globally, use
     * {@link #pauseTimers}.
     *
     * To resume WebView, call {@link #onResume}.
     */
    public void onPause() {
        checkThread();
        mProvider.onPause();
    }

    
Resumes a WebView after a previous call to onPause. 
/**
     * Resumes a WebView after a previous call to {@link #onPause}.
     */
    public void onResume() {
        checkThread();
        mProvider.onResume();
    }

    
Gets whether this WebView is paused, meaning onPause() was called. Calling onResume() sets the paused state back to false. 
@hide
/**
     * Gets whether this WebView is paused, meaning onPause() was called.
     * Calling onResume() sets the paused state back to {@code false}.
     *
     * @hide
     */
    public boolean isPaused() {
        return mProvider.isPaused();
    }

    
Informs this WebView that memory is low so that it can free any available
memory.

Deprecated:Memory caches are automatically dropped when no longer needed, and in response
            to system memory pressure.
/**
     * Informs this WebView that memory is low so that it can free any available
     * memory.
     * @deprecated Memory caches are automatically dropped when no longer needed, and in response
     *             to system memory pressure.
     */
    @Deprecated
    public void freeMemory() {
        checkThread();
        mProvider.freeMemory();
    }

    
Clears the resource cache. Note that the cache is per-application, so
this will clear the cache for all WebViews used.

Params:
  • includeDiskFiles – if false, only the RAM cache is cleared
/**
     * Clears the resource cache. Note that the cache is per-application, so
     * this will clear the cache for all WebViews used.
     *
     * @param includeDiskFiles if {@code false}, only the RAM cache is cleared
     */
    public void clearCache(boolean includeDiskFiles) {
        checkThread();
        mProvider.clearCache(includeDiskFiles);
    }

    
Removes the autocomplete popup from the currently focused form field, if present. Note this only affects the display of the autocomplete popup, it does not remove any saved form data from this WebView's store. To do that, use WebViewDatabase.clearFormData. 
/**
     * Removes the autocomplete popup from the currently focused form field, if
     * present. Note this only affects the display of the autocomplete popup,
     * it does not remove any saved form data from this WebView's store. To do
     * that, use {@link WebViewDatabase#clearFormData}.
     */
    public void clearFormData() {
        checkThread();
        mProvider.clearFormData();
    }

    
Tells this WebView to clear its internal back/forward list.

/**
     * Tells this WebView to clear its internal back/forward list.
     */
    public void clearHistory() {
        checkThread();
        mProvider.clearHistory();
    }

    
Clears the SSL preferences table stored in response to proceeding with
SSL certificate errors.

/**
     * Clears the SSL preferences table stored in response to proceeding with
     * SSL certificate errors.
     */
    public void clearSslPreferences() {
        checkThread();
        mProvider.clearSslPreferences();
    }

    
Clears the client certificate preferences stored in response
to proceeding/cancelling client cert requests. Note that WebView
automatically clears these preferences when the system keychain is updated.
The preferences are shared by all the WebViews that are created by the embedder application.

Params:
  • onCleared –  A runnable to be invoked when client certs are cleared.
                  The runnable will be called in UI thread.
/**
     * Clears the client certificate preferences stored in response
     * to proceeding/cancelling client cert requests. Note that WebView
     * automatically clears these preferences when the system keychain is updated.
     * The preferences are shared by all the WebViews that are created by the embedder application.
     *
     * @param onCleared  A runnable to be invoked when client certs are cleared.
     *                   The runnable will be called in UI thread.
     */
    public static void clearClientCertPreferences(@Nullable Runnable onCleared) {
        getFactory().getStatics().clearClientCertPreferences(onCleared);
    }

    
Starts Safe Browsing initialization.

 URL loads are not guaranteed to be protected by Safe Browsing until after callback is invoked with true. Safe Browsing is not fully supported on all devices. For those devices callback will receive false. 
 This should not be called if Safe Browsing has been disabled by manifest tag or WebSettings.setSafeBrowsingEnabled. This prepares resources used for Safe Browsing. 

This should be called with the Application Context (and will always use the Application
context to do its work regardless).

Params:
  • context – Application Context.
  • callback – will be called on the UI thread with true if initialization is successful, false otherwise.
/**
     * Starts Safe Browsing initialization.
     * <p>
     * URL loads are not guaranteed to be protected by Safe Browsing until after {@code callback} is
     * invoked with {@code true}. Safe Browsing is not fully supported on all devices. For those
     * devices {@code callback} will receive {@code false}.
     * <p>
     * This should not be called if Safe Browsing has been disabled by manifest tag or {@link
     * WebSettings#setSafeBrowsingEnabled}. This prepares resources used for Safe Browsing.
     * <p>
     * This should be called with the Application Context (and will always use the Application
     * context to do its work regardless).
     *
     * @param context Application Context.
     * @param callback will be called on the UI thread with {@code true} if initialization is
     * successful, {@code false} otherwise.
     */
    public static void startSafeBrowsing(@NonNull Context context,
            @Nullable ValueCallback<Boolean> callback) {
        getFactory().getStatics().initSafeBrowsing(context, callback);
    }

    
Sets the list of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks.
The list is global for all the WebViews.


Each rule should take one of these:



 Rule   Example   Matches Subdomain 


 HOSTNAME   example.com   Yes  


 .HOSTNAME   .example.com   No  


 IPV4_LITERAL   192.168.1.1   No 


 IPV6_LITERAL_WITH_BRACKETS [10:20:30:40:50:60:70:80]No





All other rules, including wildcards, are invalid.


The correct syntax for hosts is defined by RFC 3986.

Params:
  • hosts – the list of hosts
  • callback – will be called with true if hosts are successfully added to the whitelist. It will be called with false if any hosts are malformed. The callback will be run on the UI thread
/**
     * Sets the list of hosts (domain names/IP addresses) that are exempt from SafeBrowsing checks.
     * The list is global for all the WebViews.
     * <p>
     * Each rule should take one of these:
     * <table>
     * <tr><th> Rule </th> <th> Example </th> <th> Matches Subdomain</th> </tr>
     * <tr><td> HOSTNAME </td> <td> example.com </td> <td> Yes </td> </tr>
     * <tr><td> .HOSTNAME </td> <td> .example.com </td> <td> No </td> </tr>
     * <tr><td> IPV4_LITERAL </td> <td> 192.168.1.1 </td> <td> No </td></tr>
     * <tr><td> IPV6_LITERAL_WITH_BRACKETS </td><td>[10:20:30:40:50:60:70:80]</td><td>No</td></tr>
     * </table>
     * <p>
     * All other rules, including wildcards, are invalid.
     * <p>
     * The correct syntax for hosts is defined by <a
     * href="https://tools.ietf.org/html/rfc3986#section-3.2.2">RFC 3986</a>.
     *
     * @param hosts the list of hosts
     * @param callback will be called with {@code true} if hosts are successfully added to the
     * whitelist. It will be called with {@code false} if any hosts are malformed. The callback
     * will be run on the UI thread
     */
    public static void setSafeBrowsingWhitelist(@NonNull List<String> hosts,
            @Nullable ValueCallback<Boolean> callback) {
        getFactory().getStatics().setSafeBrowsingWhitelist(hosts, callback);
    }

    
Returns a URL pointing to the privacy policy for Safe Browsing reporting.

Returns:the url pointing to a privacy policy document which can be displayed to users.
/**
     * Returns a URL pointing to the privacy policy for Safe Browsing reporting.
     *
     * @return the url pointing to a privacy policy document which can be displayed to users.
     */
    @NonNull
    public static Uri getSafeBrowsingPrivacyPolicyUrl() {
        return getFactory().getStatics().getSafeBrowsingPrivacyPolicyUrl();
    }

    
Gets the WebBackForwardList for this WebView. This contains the
back/forward list for use in querying each item in the history stack.
This is a copy of the private WebBackForwardList so it contains only a
snapshot of the current state. Multiple calls to this method may return
different objects. The object returned from this method will not be
updated to reflect any new state.

/**
     * Gets the WebBackForwardList for this WebView. This contains the
     * back/forward list for use in querying each item in the history stack.
     * This is a copy of the private WebBackForwardList so it contains only a
     * snapshot of the current state. Multiple calls to this method may return
     * different objects. The object returned from this method will not be
     * updated to reflect any new state.
     */
    public WebBackForwardList copyBackForwardList() {
        checkThread();
        return mProvider.copyBackForwardList();

    }

    
Registers the listener to be notified as find-on-page operations
progress. This will replace the current listener.

Params:
/**
     * Registers the listener to be notified as find-on-page operations
     * progress. This will replace the current listener.
     *
     * @param listener an implementation of {@link FindListener}
     */
    public void setFindListener(FindListener listener) {
        checkThread();
        setupFindListenerIfNeeded();
        mFindListener.mUserFindListener = listener;
    }

    
Highlights and scrolls to the next match found by findAllAsync, wrapping around page boundaries as necessary. Notifies any registered FindListener. If findAllAsync(String) has not been called yet, or if clearMatches has been called since the last find operation, this function does nothing. 
Params:
  • forward – the direction to search
See Also:
/**
     * Highlights and scrolls to the next match found by
     * {@link #findAllAsync}, wrapping around page boundaries as necessary.
     * Notifies any registered {@link FindListener}. If {@link #findAllAsync(String)}
     * has not been called yet, or if {@link #clearMatches} has been called since the
     * last find operation, this function does nothing.
     *
     * @param forward the direction to search
     * @see #setFindListener
     */
    public void findNext(boolean forward) {
        checkThread();
        mProvider.findNext(forward);
    }

    
Finds all instances of find on the page and highlights them. Notifies any registered FindListener. 
Params:
  • find – the string to find
See Also:
Returns:the number of occurrences of the String "find" that were found
Deprecated:findAllAsync is preferred.
/**
     * Finds all instances of find on the page and highlights them.
     * Notifies any registered {@link FindListener}.
     *
     * @param find the string to find
     * @return the number of occurrences of the String "find" that were found
     * @deprecated {@link #findAllAsync} is preferred.
     * @see #setFindListener
     */
    @Deprecated
    public int findAll(String find) {
        checkThread();
        StrictMode.noteSlowCall("findAll blocks UI: prefer findAllAsync");
        return mProvider.findAll(find);
    }

    
Finds all instances of find on the page and highlights them, asynchronously. Notifies any registered FindListener. Successive calls to this will cancel any pending searches. 
Params:
  • find – the string to find.
See Also:
/**
     * Finds all instances of find on the page and highlights them,
     * asynchronously. Notifies any registered {@link FindListener}.
     * Successive calls to this will cancel any pending searches.
     *
     * @param find the string to find.
     * @see #setFindListener
     */
    public void findAllAsync(String find) {
        checkThread();
        mProvider.findAllAsync(find);
    }

    
Starts an ActionMode for finding text in this WebView.  Only works if this
WebView is attached to the view system.

Params:
  • text – if non-null, will be the initial text to search for.
            Otherwise, the last String searched for in this WebView will
            be used to start.
  • showIme – if true, show the IME, assuming the user will begin typing. If false and text is non-null, perform a find all.
Returns:true if the find dialog is shown, false otherwise
Deprecated:This method does not work reliably on all Android versions;
            implementing a custom find dialog using WebView.findAllAsync()
            provides a more robust solution.
/**
     * Starts an ActionMode for finding text in this WebView.  Only works if this
     * WebView is attached to the view system.
     *
     * @param text if non-null, will be the initial text to search for.
     *             Otherwise, the last String searched for in this WebView will
     *             be used to start.
     * @param showIme if {@code true}, show the IME, assuming the user will begin typing.
     *                If {@code false} and text is non-null, perform a find all.
     * @return {@code true} if the find dialog is shown, {@code false} otherwise
     * @deprecated This method does not work reliably on all Android versions;
     *             implementing a custom find dialog using WebView.findAllAsync()
     *             provides a more robust solution.
     */
    @Deprecated
    public boolean showFindDialog(@Nullable String text, boolean showIme) {
        checkThread();
        return mProvider.showFindDialog(text, showIme);
    }

    
Gets the first substring consisting of the address of a physical
location. Currently, only addresses in the United States are detected,
and consist of:

    
  
  • a house number
    • 
  
  • a street name
    • 
  
  • a street type (Road, Circle, etc), either spelled out or
      abbreviated
    • 
  
  • a city name
    • 
  
  • a state or territory, either spelled out or two-letter abbr
    • 
  
  • an optional 5 digit or 9 digit zip code
    • 


All names must be correctly capitalized, and the zip code, if present,
must be valid for the state. The street type must be a standard USPS
spelling or abbreviation. The state or territory must also be spelled
or abbreviated using USPS standards. The house number may not exceed
five digits.

Params:
  • addr – the string to search for addresses
Returns:the address, or if no address is found, null
Deprecated:this method is superseded by TextClassifier.generateLinks(Request). Avoid using this method even when targeting API levels where no alternative is available.
/**
     * Gets the first substring consisting of the address of a physical
     * location. Currently, only addresses in the United States are detected,
     * and consist of:
     * <ul>
     *   <li>a house number</li>
     *   <li>a street name</li>
     *   <li>a street type (Road, Circle, etc), either spelled out or
     *       abbreviated</li>
     *   <li>a city name</li>
     *   <li>a state or territory, either spelled out or two-letter abbr</li>
     *   <li>an optional 5 digit or 9 digit zip code</li>
     * </ul>
     * All names must be correctly capitalized, and the zip code, if present,
     * must be valid for the state. The street type must be a standard USPS
     * spelling or abbreviation. The state or territory must also be spelled
     * or abbreviated using USPS standards. The house number may not exceed
     * five digits.
     *
     * @param addr the string to search for addresses
     * @return the address, or if no address is found, {@code null}
     * @deprecated this method is superseded by {@link TextClassifier#generateLinks(
     * android.view.textclassifier.TextLinks.Request)}. Avoid using this method even when targeting
     * API levels where no alternative is available.
     */
    @Nullable
    @Deprecated
    public static String findAddress(String addr) {
        if (addr == null) {
            throw new NullPointerException("addr is null");
        }
        return FindAddress.findAddress(addr);
    }

    
For apps targeting the L release, WebView has a new default behavior that reduces
memory footprint and increases performance by intelligently choosing
the portion of the HTML document that needs to be drawn. These
optimizations are transparent to the developers. However, under certain
circumstances, an App developer may want to disable them:

    
  
  1. When an app uses onDraw to do own drawing and accesses portions of the page that is way outside the visible portion of the page.
    2. 
  
  2. When an app uses capturePicture to capture a very large HTML document. Note that capturePicture is a deprecated API.
    3. 


Enabling drawing the entire HTML document has a significant performance
cost. This method should be called before any WebViews are created.

/**
     * For apps targeting the L release, WebView has a new default behavior that reduces
     * memory footprint and increases performance by intelligently choosing
     * the portion of the HTML document that needs to be drawn. These
     * optimizations are transparent to the developers. However, under certain
     * circumstances, an App developer may want to disable them:
     * <ol>
     *   <li>When an app uses {@link #onDraw} to do own drawing and accesses portions
     *       of the page that is way outside the visible portion of the page.</li>
     *   <li>When an app uses {@link #capturePicture} to capture a very large HTML document.
     *       Note that capturePicture is a deprecated API.</li>
     * </ol>
     * Enabling drawing the entire HTML document has a significant performance
     * cost. This method should be called before any WebViews are created.
     */
    public static void enableSlowWholeDocumentDraw() {
        getFactory().getStatics().enableSlowWholeDocumentDraw();
    }

    
Clears the highlighting surrounding text matches created by findAllAsync. 
/**
     * Clears the highlighting surrounding text matches created by
     * {@link #findAllAsync}.
     */
    public void clearMatches() {
        checkThread();
        mProvider.clearMatches();
    }

    
Queries the document to see if it contains any image references. The
message object will be dispatched with arg1 being set to 1 if images
were found and 0 if the document does not reference any images.

Params:
  • response – the message that will be dispatched with the result
/**
     * Queries the document to see if it contains any image references. The
     * message object will be dispatched with arg1 being set to 1 if images
     * were found and 0 if the document does not reference any images.
     *
     * @param response the message that will be dispatched with the result
     */
    public void documentHasImages(Message response) {
        checkThread();
        mProvider.documentHasImages(response);
    }

    
Sets the WebViewClient that will receive various notifications and
requests. This will replace the current handler.

Params:
  • client – an implementation of WebViewClient
See Also:
/**
     * Sets the WebViewClient that will receive various notifications and
     * requests. This will replace the current handler.
     *
     * @param client an implementation of WebViewClient
     * @see #getWebViewClient
     */
    public void setWebViewClient(WebViewClient client) {
        checkThread();
        mProvider.setWebViewClient(client);
    }

    
Gets the WebViewClient.

See Also:
Returns:the WebViewClient, or a default client if not yet set
/**
     * Gets the WebViewClient.
     *
     * @return the WebViewClient, or a default client if not yet set
     * @see #setWebViewClient
     */
    public WebViewClient getWebViewClient() {
        checkThread();
        return mProvider.getWebViewClient();
    }

    
Registers the interface to be used when content can not be handled by
the rendering engine, and should be downloaded instead. This will replace
the current handler.

Params:
  • listener – an implementation of DownloadListener
/**
     * Registers the interface to be used when content can not be handled by
     * the rendering engine, and should be downloaded instead. This will replace
     * the current handler.
     *
     * @param listener an implementation of DownloadListener
     */
    public void setDownloadListener(DownloadListener listener) {
        checkThread();
        mProvider.setDownloadListener(listener);
    }

    
Sets the chrome handler. This is an implementation of WebChromeClient for
use in handling JavaScript dialogs, favicons, titles, and the progress.
This will replace the current handler.

Params:
  • client – an implementation of WebChromeClient
See Also:
/**
     * Sets the chrome handler. This is an implementation of WebChromeClient for
     * use in handling JavaScript dialogs, favicons, titles, and the progress.
     * This will replace the current handler.
     *
     * @param client an implementation of WebChromeClient
     * @see #getWebChromeClient
     */
    public void setWebChromeClient(WebChromeClient client) {
        checkThread();
        mProvider.setWebChromeClient(client);
    }

    
Gets the chrome handler.

See Also:
Returns:the WebChromeClient, or null if not yet set
/**
     * Gets the chrome handler.
     *
     * @return the WebChromeClient, or {@code null} if not yet set
     * @see #setWebChromeClient
     */
    @Nullable
    public WebChromeClient getWebChromeClient() {
        checkThread();
        return mProvider.getWebChromeClient();
    }

    
Sets the Picture listener. This is an interface used to receive
notifications of a new Picture.

Params:
  • listener – an implementation of WebView.PictureListener
Deprecated:This method is now obsolete.
/**
     * Sets the Picture listener. This is an interface used to receive
     * notifications of a new Picture.
     *
     * @param listener an implementation of WebView.PictureListener
     * @deprecated This method is now obsolete.
     */
    @Deprecated
    public void setPictureListener(PictureListener listener) {
        checkThread();
        mProvider.setPictureListener(listener);
    }

    
Injects the supplied Java object into this WebView. The object is injected into the JavaScript context of the main frame, using the supplied name. This allows the Java object's methods to be accessed from JavaScript. For applications targeted to API level VERSION_CODES.JELLY_BEAN_MR1 and above, only public methods that are annotated with JavascriptInterface can be accessed from JavaScript. For applications targeted to API level VERSION_CODES.JELLY_BEAN or below, all public methods (including the inherited ones) can be accessed, see the important security note below for implications. 
 Note that injected objects will not appear in JavaScript until the page is next
(re)loaded. JavaScript should be enabled before injecting the object. For example:

class JsObject { @JavascriptInterface public String toString() { return "injectedObject"; } } webview.getSettings().setJavaScriptEnabled(true); webView.addJavascriptInterface(new JsObject(), "injectedObject"); webView.loadData("", "text/html", null);
webView.loadUrl("javascript:alert(injectedObject.toString())");



IMPORTANT:

    

  •  This method can be used to allow JavaScript to control the host application. This is a powerful feature, but also presents a security risk for apps targeting VERSION_CODES.JELLY_BEAN or earlier. Apps that target a version later than VERSION_CODES.JELLY_BEAN are still vulnerable if the app runs on a device running Android earlier than 4.2. The most secure way to use this method is to target VERSION_CODES.JELLY_BEAN_MR1 and to ensure the method is called only when running on Android 4.2 or later. With these older versions, JavaScript could use reflection to access an injected object's public fields. Use of this method in a WebView containing untrusted content could allow an attacker to manipulate the host application in unintended ways, executing Java code with the permissions of the host application. Use extreme care when using this method in a WebView which could contain untrusted content.
    • 

  •  JavaScript interacts with Java object on a private, background
thread of this WebView. Care is therefore required to maintain thread
safety.

    • 

  •  The Java object's fields are not accessible.
    • 

  •  For applications targeted to API level VERSION_CODES.LOLLIPOP and above, methods of injected Java objects are enumerable from JavaScript.
    • 



Params:
  • object – the Java object to inject into this WebView's JavaScript context. null values are ignored.
  • name – the name used to expose the object in JavaScript
/**
     * Injects the supplied Java object into this WebView. The object is
     * injected into the JavaScript context of the main frame, using the
     * supplied name. This allows the Java object's methods to be
     * accessed from JavaScript. For applications targeted to API
     * level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     * and above, only public methods that are annotated with
     * {@link android.webkit.JavascriptInterface} can be accessed from JavaScript.
     * For applications targeted to API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN} or below,
     * all public methods (including the inherited ones) can be accessed, see the
     * important security note below for implications.
     * <p> Note that injected objects will not appear in JavaScript until the page is next
     * (re)loaded. JavaScript should be enabled before injecting the object. For example:
     * <pre>
     * class JsObject {
     *    {@literal @}JavascriptInterface
     *    public String toString() { return "injectedObject"; }
     * }
     * webview.getSettings().setJavaScriptEnabled(true);
     * webView.addJavascriptInterface(new JsObject(), "injectedObject");
     * webView.loadData("<!DOCTYPE html><title></title>", "text/html", null);
     * webView.loadUrl("javascript:alert(injectedObject.toString())");</pre>
     * <p>
     * <strong>IMPORTANT:</strong>
     * <ul>
     * <li> This method can be used to allow JavaScript to control the host
     * application. This is a powerful feature, but also presents a security
     * risk for apps targeting {@link android.os.Build.VERSION_CODES#JELLY_BEAN} or earlier.
     * Apps that target a version later than {@link android.os.Build.VERSION_CODES#JELLY_BEAN}
     * are still vulnerable if the app runs on a device running Android earlier than 4.2.
     * The most secure way to use this method is to target {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     * and to ensure the method is called only when running on Android 4.2 or later.
     * With these older versions, JavaScript could use reflection to access an
     * injected object's public fields. Use of this method in a WebView
     * containing untrusted content could allow an attacker to manipulate the
     * host application in unintended ways, executing Java code with the
     * permissions of the host application. Use extreme care when using this
     * method in a WebView which could contain untrusted content.</li>
     * <li> JavaScript interacts with Java object on a private, background
     * thread of this WebView. Care is therefore required to maintain thread
     * safety.
     * </li>
     * <li> The Java object's fields are not accessible.</li>
     * <li> For applications targeted to API level {@link android.os.Build.VERSION_CODES#LOLLIPOP}
     * and above, methods of injected Java objects are enumerable from
     * JavaScript.</li>
     * </ul>
     *
     * @param object the Java object to inject into this WebView's JavaScript
     *               context. {@code null} values are ignored.
     * @param name the name used to expose the object in JavaScript
     */
    public void addJavascriptInterface(Object object, String name) {
        checkThread();
        mProvider.addJavascriptInterface(object, name);
    }

    
Removes a previously injected Java object from this WebView. Note that the removal will not be reflected in JavaScript until the page is next (re)loaded. See addJavascriptInterface. 
Params:
  • name – the name used to expose the object in JavaScript
/**
     * Removes a previously injected Java object from this WebView. Note that
     * the removal will not be reflected in JavaScript until the page is next
     * (re)loaded. See {@link #addJavascriptInterface}.
     *
     * @param name the name used to expose the object in JavaScript
     */
    public void removeJavascriptInterface(@NonNull String name) {
        checkThread();
        mProvider.removeJavascriptInterface(name);
    }

    
Creates a message channel to communicate with JS and returns the message
ports that represent the endpoints of this message channel. The HTML5 message
channel functionality is described
here


The returned message channels are entangled and already in started state.

Returns:the two message ports that form the message channel.
/**
     * Creates a message channel to communicate with JS and returns the message
     * ports that represent the endpoints of this message channel. The HTML5 message
     * channel functionality is described
     * <a href="https://html.spec.whatwg.org/multipage/comms.html#messagechannel">here
     * </a>
     *
     * <p>The returned message channels are entangled and already in started state.
     *
     * @return the two message ports that form the message channel.
     */
    public WebMessagePort[] createWebMessageChannel() {
        checkThread();
        return mProvider.createWebMessageChannel();
    }

    
Post a message to main frame. The embedded application can restrict the
messages to a certain target origin. See

HTML5 spec for how target origin can be used.


A target origin can be set as a wildcard ("*"). However this is not recommended.
See the page above for security issues.

 Content loaded via loadData(String, String, String) will not have a valid origin, and thus cannot be sent messages securely. If you need to send messages using this function, you should use loadDataWithBaseURL(String, String, String, String, String) with a valid HTTP or HTTPS baseUrl to define a valid origin that can be used for messaging. 
Params:
  • message – the WebMessage
  • targetOrigin – the target origin.
/**
     * Post a message to main frame. The embedded application can restrict the
     * messages to a certain target origin. See
     * <a href="https://html.spec.whatwg.org/multipage/comms.html#posting-messages">
     * HTML5 spec</a> for how target origin can be used.
     * <p>
     * A target origin can be set as a wildcard ("*"). However this is not recommended.
     * See the page above for security issues.
     * <p>
     * Content loaded via {@link #loadData(String,String,String)} will not have a
     * valid origin, and thus cannot be sent messages securely. If you need to send
     * messages using this function, you should use
     * {@link #loadDataWithBaseURL(String,String,String,String,String)} with a valid
     * HTTP or HTTPS {@code baseUrl} to define a valid origin that can be used for
     * messaging.
     *
     * @param message the WebMessage
     * @param targetOrigin the target origin.
     */
    public void postWebMessage(WebMessage message, Uri targetOrigin) {
        checkThread();
        mProvider.postMessageToMainFrame(message, targetOrigin);
    }

    
Gets the WebSettings object used to control the settings for this
WebView.

Returns:a WebSettings object that can be used to control this WebView's
        settings
/**
     * Gets the WebSettings object used to control the settings for this
     * WebView.
     *
     * @return a WebSettings object that can be used to control this WebView's
     *         settings
     */
    public WebSettings getSettings() {
        checkThread();
        return mProvider.getSettings();
    }

    
Enables debugging of web contents (HTML / CSS / JavaScript) loaded into any WebViews of this application. This flag can be enabled in order to facilitate debugging of web layouts and JavaScript code running inside WebViews. Please refer to WebView documentation for the debugging guide. The default is false. 
Params:
  • enabled – whether to enable web contents debugging
/**
     * Enables debugging of web contents (HTML / CSS / JavaScript)
     * loaded into any WebViews of this application. This flag can be enabled
     * in order to facilitate debugging of web layouts and JavaScript
     * code running inside WebViews. Please refer to WebView documentation
     * for the debugging guide.
     *
     * The default is {@code false}.
     *
     * @param enabled whether to enable web contents debugging
     */
    public static void setWebContentsDebuggingEnabled(boolean enabled) {
        getFactory().getStatics().setWebContentsDebuggingEnabled(enabled);
    }

    
Gets the list of currently loaded plugins.

Returns:the list of currently loaded plugins
Deprecated:This was used for Gears, which has been deprecated.
@hide
/**
     * Gets the list of currently loaded plugins.
     *
     * @return the list of currently loaded plugins
     * @deprecated This was used for Gears, which has been deprecated.
     * @hide
     */
    @Deprecated
    public static synchronized PluginList getPluginList() {
        return new PluginList();
    }

    
Define the directory used to store WebView data for the current process.
The provided suffix will be used when constructing data and cache
directory paths. If this API is not called, no suffix will be used.
Each directory can be used by only one process in the application. If more
than one process in an app wishes to use WebView, only one process can use
the default directory, and other processes must call this API to define
a unique suffix.

 This means that different processes in the same application cannot directly share WebView-related data, since the data directories must be distinct. Applications that use this API may have to explicitly pass data between processes. For example, login cookies may have to be copied from one process's cookie jar to the other using CookieManager if both processes' WebViews are intended to be logged in. 
 Most applications should simply ensure that all components of the app that rely on WebView are in the same process, to avoid needing multiple data directories. The disableWebView method can be used to ensure that the other processes do not use WebView by accident in this case. 

This API must be called before any instances of WebView are created in
this process and before any other methods in the android.webkit package
are called by this process.

Params:
  • suffix – The directory name suffix to be used for the current
              process. Must not contain a path separator.
Throws:
/**
     * Define the directory used to store WebView data for the current process.
     * The provided suffix will be used when constructing data and cache
     * directory paths. If this API is not called, no suffix will be used.
     * Each directory can be used by only one process in the application. If more
     * than one process in an app wishes to use WebView, only one process can use
     * the default directory, and other processes must call this API to define
     * a unique suffix.
     * <p>
     * This means that different processes in the same application cannot directly
     * share WebView-related data, since the data directories must be distinct.
     * Applications that use this API may have to explicitly pass data between
     * processes. For example, login cookies may have to be copied from one
     * process's cookie jar to the other using {@link CookieManager} if both
     * processes' WebViews are intended to be logged in.
     * <p>
     * Most applications should simply ensure that all components of the app
     * that rely on WebView are in the same process, to avoid needing multiple
     * data directories. The {@link #disableWebView} method can be used to ensure
     * that the other processes do not use WebView by accident in this case.
     * <p>
     * This API must be called before any instances of WebView are created in
     * this process and before any other methods in the android.webkit package
     * are called by this process.
     *
     * @param suffix The directory name suffix to be used for the current
     *               process. Must not contain a path separator.
     * @throws IllegalStateException if WebView has already been initialized
     *                               in the current process.
     * @throws IllegalArgumentException if the suffix contains a path separator.
     */
    public static void setDataDirectorySuffix(String suffix) {
        WebViewFactory.setDataDirectorySuffix(suffix);
    }

    
Indicate that the current process does not intend to use WebView, and
that an exception should be thrown if a WebView is created or any other
methods in the android.webkit package are used.

 Applications with multiple processes may wish to call this in processes that are not intended to use WebView to avoid accidentally incurring the memory usage of initializing WebView in long-lived processes that have no need for it, and to prevent potential data directory conflicts (see setDataDirectorySuffix). 
 For example, an audio player application with one process for its activities and another process for its playback service may wish to call this method in the playback service's Service.onCreate. 
Throws:
/**
     * Indicate that the current process does not intend to use WebView, and
     * that an exception should be thrown if a WebView is created or any other
     * methods in the android.webkit package are used.
     * <p>
     * Applications with multiple processes may wish to call this in processes
     * that are not intended to use WebView to avoid accidentally incurring
     * the memory usage of initializing WebView in long-lived processes that
     * have no need for it, and to prevent potential data directory conflicts
     * (see {@link #setDataDirectorySuffix}).
     * <p>
     * For example, an audio player application with one process for its
     * activities and another process for its playback service may wish to call
     * this method in the playback service's {@link android.app.Service#onCreate}.
     *
     * @throws IllegalStateException if WebView has already been initialized
     *                               in the current process.
     */
    public static void disableWebView() {
        WebViewFactory.disableWebView();
    }


    
Deprecated:This was used for Gears, which has been deprecated.
@hide
/**
     * @deprecated This was used for Gears, which has been deprecated.
     * @hide
     */
    @Deprecated
    public void refreshPlugins(boolean reloadOpenPages) {
        checkThread();
    }

    
Puts this WebView into text selection mode. Do not rely on this
functionality; it will be deprecated in the future.

Deprecated:This method is now obsolete.
@hideSince API level VERSION_CODES.JELLY_BEAN_MR1
/**
     * Puts this WebView into text selection mode. Do not rely on this
     * functionality; it will be deprecated in the future.
     *
     * @deprecated This method is now obsolete.
     * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     */
    @Deprecated
    public void emulateShiftHeld() {
        checkThread();
    }

    
Deprecated:WebView no longer needs to implement
ViewGroup.OnHierarchyChangeListener.  This method does nothing now.
/**
     * @deprecated WebView no longer needs to implement
     * ViewGroup.OnHierarchyChangeListener.  This method does nothing now.
     */
    @Override
    // Cannot add @hide as this can always be accessed via the interface.
    @Deprecated
    public void onChildViewAdded(View parent, View child) {}

    
Deprecated:WebView no longer needs to implement
ViewGroup.OnHierarchyChangeListener.  This method does nothing now.
/**
     * @deprecated WebView no longer needs to implement
     * ViewGroup.OnHierarchyChangeListener.  This method does nothing now.
     */
    @Override
    // Cannot add @hide as this can always be accessed via the interface.
    @Deprecated
    public void onChildViewRemoved(View p, View child) {}

    
Deprecated:WebView should not have implemented
ViewTreeObserver.OnGlobalFocusChangeListener. This method does nothing now.
/**
     * @deprecated WebView should not have implemented
     * ViewTreeObserver.OnGlobalFocusChangeListener. This method does nothing now.
     */
    @Override
    // Cannot add @hide as this can always be accessed via the interface.
    @Deprecated
    public void onGlobalFocusChanged(View oldFocus, View newFocus) {
    }

    
Deprecated:Only the default case, true, will be supported in a future version.
/**
     * @deprecated Only the default case, {@code true}, will be supported in a future version.
     */
    @Deprecated
    public void setMapTrackballToArrowKeys(boolean setMap) {
        checkThread();
        mProvider.setMapTrackballToArrowKeys(setMap);
    }


    public void flingScroll(int vx, int vy) {
        checkThread();
        mProvider.flingScroll(vx, vy);
    }

    
Gets the zoom controls for this WebView, as a separate View. The caller
is responsible for inserting this View into the layout hierarchy.

 API level VERSION_CODES.CUPCAKE introduced built-in zoom mechanisms for the WebView, as opposed to these separate zoom controls. The built-in mechanisms are preferred and can be enabled using WebSettings.setBuiltInZoomControls. 
Deprecated:the built-in zoom mechanisms are preferred
@hideSince API level VERSION_CODES.JELLY_BEAN
/**
     * Gets the zoom controls for this WebView, as a separate View. The caller
     * is responsible for inserting this View into the layout hierarchy.
     * <p/>
     * API level {@link android.os.Build.VERSION_CODES#CUPCAKE} introduced
     * built-in zoom mechanisms for the WebView, as opposed to these separate
     * zoom controls. The built-in mechanisms are preferred and can be enabled
     * using {@link WebSettings#setBuiltInZoomControls}.
     *
     * @deprecated the built-in zoom mechanisms are preferred
     * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN}
     */
    @Deprecated
    public View getZoomControls() {
        checkThread();
        return mProvider.getZoomControls();
    }

    
Gets whether this WebView can be zoomed in.

Returns:true if this WebView can be zoomed in
Deprecated:This method is prone to inaccuracy due to race conditions between the web rendering and UI threads; prefer WebViewClient.onScaleChanged.
/**
     * Gets whether this WebView can be zoomed in.
     *
     * @return {@code true} if this WebView can be zoomed in
     *
     * @deprecated This method is prone to inaccuracy due to race conditions
     * between the web rendering and UI threads; prefer
     * {@link WebViewClient#onScaleChanged}.
     */
    @Deprecated
    public boolean canZoomIn() {
        checkThread();
        return mProvider.canZoomIn();
    }

    
Gets whether this WebView can be zoomed out.

Returns:true if this WebView can be zoomed out
Deprecated:This method is prone to inaccuracy due to race conditions between the web rendering and UI threads; prefer WebViewClient.onScaleChanged.
/**
     * Gets whether this WebView can be zoomed out.
     *
     * @return {@code true} if this WebView can be zoomed out
     *
     * @deprecated This method is prone to inaccuracy due to race conditions
     * between the web rendering and UI threads; prefer
     * {@link WebViewClient#onScaleChanged}.
     */
    @Deprecated
    public boolean canZoomOut() {
        checkThread();
        return mProvider.canZoomOut();
    }

    
Performs a zoom operation in this WebView.

Params:
  • zoomFactor – the zoom factor to apply. The zoom factor will be clamped to the WebView's
zoom limits. This value must be in the range 0.01 to 100.0 inclusive.
/**
     * Performs a zoom operation in this WebView.
     *
     * @param zoomFactor the zoom factor to apply. The zoom factor will be clamped to the WebView's
     * zoom limits. This value must be in the range 0.01 to 100.0 inclusive.
     */
    public void zoomBy(float zoomFactor) {
        checkThread();
        if (zoomFactor < 0.01)
            throw new IllegalArgumentException("zoomFactor must be greater than 0.01.");
        if (zoomFactor > 100.0)
            throw new IllegalArgumentException("zoomFactor must be less than 100.");
        mProvider.zoomBy(zoomFactor);
    }

    
Performs zoom in in this WebView.

Returns:true if zoom in succeeds, false if no zoom changes
/**
     * Performs zoom in in this WebView.
     *
     * @return {@code true} if zoom in succeeds, {@code false} if no zoom changes
     */
    public boolean zoomIn() {
        checkThread();
        return mProvider.zoomIn();
    }

    
Performs zoom out in this WebView.

Returns:true if zoom out succeeds, false if no zoom changes
/**
     * Performs zoom out in this WebView.
     *
     * @return {@code true} if zoom out succeeds, {@code false} if no zoom changes
     */
    public boolean zoomOut() {
        checkThread();
        return mProvider.zoomOut();
    }

    
Deprecated:This method is now obsolete.
@hideSince API level VERSION_CODES.JELLY_BEAN_MR1
/**
     * @deprecated This method is now obsolete.
     * @hide Since API level {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}
     */
    @Deprecated
    public void debugDump() {
        checkThread();
    }

    
@hide
/**
     * See {@link ViewDebug.HierarchyHandler#dumpViewHierarchyWithProperties(BufferedWriter, int)}
     * @hide
     */
    @Override
    public void dumpViewHierarchyWithProperties(BufferedWriter out, int level) {
        mProvider.dumpViewHierarchyWithProperties(out, level);
    }

    
@hide
/**
     * See {@link ViewDebug.HierarchyHandler#findHierarchyView(String, int)}
     * @hide
     */
    @Override
    public View findHierarchyView(String className, int hashCode) {
        return mProvider.findHierarchyView(className, hashCode);
    }

    
@hide
/** @hide */
    @IntDef(prefix = { "RENDERER_PRIORITY_" }, value = {
            RENDERER_PRIORITY_WAIVED,
            RENDERER_PRIORITY_BOUND,
            RENDERER_PRIORITY_IMPORTANT
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface RendererPriority {}

    
The renderer associated with this WebView is bound with Context.BIND_WAIVE_PRIORITY. At this priority level WebView renderers will be strong targets for out of memory killing. Use with setRendererPriorityPolicy. 
/**
     * The renderer associated with this WebView is bound with
     * {@link Context#BIND_WAIVE_PRIORITY}. At this priority level
     * {@link WebView} renderers will be strong targets for out of memory
     * killing.
     *
     * Use with {@link #setRendererPriorityPolicy}.
     */
    public static final int RENDERER_PRIORITY_WAIVED = 0;
    
The renderer associated with this WebView is bound with the default priority for services. Use with setRendererPriorityPolicy. 
/**
     * The renderer associated with this WebView is bound with
     * the default priority for services.
     *
     * Use with {@link #setRendererPriorityPolicy}.
     */
    public static final int RENDERER_PRIORITY_BOUND = 1;
    
The renderer associated with this WebView is bound with Context.BIND_IMPORTANT. Use with setRendererPriorityPolicy. 
/**
     * The renderer associated with this WebView is bound with
     * {@link Context#BIND_IMPORTANT}.
     *
     * Use with {@link #setRendererPriorityPolicy}.
     */
    public static final int RENDERER_PRIORITY_IMPORTANT = 2;

    
Set the renderer priority policy for this WebView. The priority policy will be used to determine whether an out of process renderer should be considered to be a target for OOM killing. Because a renderer can be associated with more than one WebView, the final priority it is computed as the maximum of any attached WebViews. When a WebView is destroyed it will cease to be considerered when calculating the renderer priority. Once no WebViews remain associated with the renderer, the priority of the renderer will be reduced to RENDERER_PRIORITY_WAIVED. The default policy is to set the priority to RENDERER_PRIORITY_IMPORTANT regardless of visibility, and this should not be changed unless the caller also handles renderer crashes with WebViewClient.onRenderProcessGone. Any other setting will result in WebView renderers being killed by the system more aggressively than the application. 
Params:
  • rendererRequestedPriority – the minimum priority at which
       this WebView desires the renderer process to be bound.
  • waivedWhenNotVisible – if true, this flag specifies that when this WebView is not visible, it will be treated as if it had requested a priority of RENDERER_PRIORITY_WAIVED.
/**
     * Set the renderer priority policy for this {@link WebView}. The
     * priority policy will be used to determine whether an out of
     * process renderer should be considered to be a target for OOM
     * killing.
     *
     * Because a renderer can be associated with more than one
     * WebView, the final priority it is computed as the maximum of
     * any attached WebViews. When a WebView is destroyed it will
     * cease to be considerered when calculating the renderer
     * priority. Once no WebViews remain associated with the renderer,
     * the priority of the renderer will be reduced to
     * {@link #RENDERER_PRIORITY_WAIVED}.
     *
     * The default policy is to set the priority to
     * {@link #RENDERER_PRIORITY_IMPORTANT} regardless of visibility,
     * and this should not be changed unless the caller also handles
     * renderer crashes with
     * {@link WebViewClient#onRenderProcessGone}. Any other setting
     * will result in WebView renderers being killed by the system
     * more aggressively than the application.
     *
     * @param rendererRequestedPriority the minimum priority at which
     *        this WebView desires the renderer process to be bound.
     * @param waivedWhenNotVisible if {@code true}, this flag specifies that
     *        when this WebView is not visible, it will be treated as
     *        if it had requested a priority of
     *        {@link #RENDERER_PRIORITY_WAIVED}.
     */
    public void setRendererPriorityPolicy(
            @RendererPriority int rendererRequestedPriority,
            boolean waivedWhenNotVisible) {
        mProvider.setRendererPriorityPolicy(rendererRequestedPriority, waivedWhenNotVisible);
    }

    
Get the requested renderer priority for this WebView.

Returns:the requested renderer priority policy.
/**
     * Get the requested renderer priority for this WebView.
     *
     * @return the requested renderer priority policy.
     */
    @RendererPriority
    public int getRendererRequestedPriority() {
        return mProvider.getRendererRequestedPriority();
    }

    
Return whether this WebView requests a priority of RENDERER_PRIORITY_WAIVED when not visible. 
Returns:whether this WebView requests a priority of RENDERER_PRIORITY_WAIVED when not visible.
/**
     * Return whether this WebView requests a priority of
     * {@link #RENDERER_PRIORITY_WAIVED} when not visible.
     *
     * @return whether this WebView requests a priority of
     * {@link #RENDERER_PRIORITY_WAIVED} when not visible.
     */
    public boolean getRendererPriorityWaivedWhenNotVisible() {
        return mProvider.getRendererPriorityWaivedWhenNotVisible();
    }

    
Sets the TextClassifier for this WebView. 
/**
     * Sets the {@link TextClassifier} for this WebView.
     */
    public void setTextClassifier(@Nullable TextClassifier textClassifier) {
        mProvider.setTextClassifier(textClassifier);
    }

    
Returns the TextClassifier used by this WebView. If no TextClassifier has been set, this WebView uses the default set by the system. 
/**
     * Returns the {@link TextClassifier} used by this WebView.
     * If no TextClassifier has been set, this WebView uses the default set by the system.
     */
    @NonNull
    public TextClassifier getTextClassifier() {
        return mProvider.getTextClassifier();
    }

    
Returns the ClassLoader used to load internal WebView classes. This method is meant for use by the WebView Support Library, there is no reason to use this method otherwise. 
/**
     * Returns the {@link ClassLoader} used to load internal WebView classes.
     * This method is meant for use by the WebView Support Library, there is no reason to use this
     * method otherwise.
     */
    @NonNull
    public static ClassLoader getWebViewClassLoader() {
        return getFactory().getWebViewClassLoader();
    }

    
Returns the Looper corresponding to the thread on which WebView calls must be made. 
/**
     * Returns the {@link Looper} corresponding to the thread on which WebView calls must be made.
     */
    @NonNull
    public Looper getWebViewLooper() {
        return mWebViewThread;
    }

    //-------------------------------------------------------------------------
    // Interface for WebView providers
    //-------------------------------------------------------------------------

    
Gets the WebViewProvider. Used by providers to obtain the underlying
implementation, e.g. when the application responds to
WebViewClient.onCreateWindow() request.

@hideWebViewProvider is not public API.
/**
     * Gets the WebViewProvider. Used by providers to obtain the underlying
     * implementation, e.g. when the application responds to
     * WebViewClient.onCreateWindow() request.
     *
     * @hide WebViewProvider is not public API.
     */
    @SystemApi
    public WebViewProvider getWebViewProvider() {
        return mProvider;
    }

    
Callback interface, allows the provider implementation to access non-public methods
and fields, and make super-class calls in this WebView instance.

@hideOnly for use by WebViewProvider implementations
/**
     * Callback interface, allows the provider implementation to access non-public methods
     * and fields, and make super-class calls in this WebView instance.
     * @hide Only for use by WebViewProvider implementations
     */
    @SystemApi
    public class PrivateAccess {
        // ---- Access to super-class methods ----
        public int super_getScrollBarStyle() {
            return WebView.super.getScrollBarStyle();
        }

        public void super_scrollTo(int scrollX, int scrollY) {
            WebView.super.scrollTo(scrollX, scrollY);
        }

        public void super_computeScroll() {
            WebView.super.computeScroll();
        }

        public boolean super_onHoverEvent(MotionEvent event) {
            return WebView.super.onHoverEvent(event);
        }

        public boolean super_performAccessibilityAction(int action, Bundle arguments) {
            return WebView.super.performAccessibilityActionInternal(action, arguments);
        }

        public boolean super_performLongClick() {
            return WebView.super.performLongClick();
        }

        public boolean super_setFrame(int left, int top, int right, int bottom) {
            return WebView.super.setFrame(left, top, right, bottom);
        }

        public boolean super_dispatchKeyEvent(KeyEvent event) {
            return WebView.super.dispatchKeyEvent(event);
        }

        public boolean super_onGenericMotionEvent(MotionEvent event) {
            return WebView.super.onGenericMotionEvent(event);
        }

        public boolean super_requestFocus(int direction, Rect previouslyFocusedRect) {
            return WebView.super.requestFocus(direction, previouslyFocusedRect);
        }

        public void super_setLayoutParams(ViewGroup.LayoutParams params) {
            WebView.super.setLayoutParams(params);
        }

        public void super_startActivityForResult(Intent intent, int requestCode) {
            WebView.super.startActivityForResult(intent, requestCode);
        }

        // ---- Access to non-public methods ----
        public void overScrollBy(int deltaX, int deltaY,
                int scrollX, int scrollY,
                int scrollRangeX, int scrollRangeY,
                int maxOverScrollX, int maxOverScrollY,
                boolean isTouchEvent) {
            WebView.this.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY,
                    maxOverScrollX, maxOverScrollY, isTouchEvent);
        }

        public void awakenScrollBars(int duration) {
            WebView.this.awakenScrollBars(duration);
        }

        public void awakenScrollBars(int duration, boolean invalidate) {
            WebView.this.awakenScrollBars(duration, invalidate);
        }

        public float getVerticalScrollFactor() {
            return WebView.this.getVerticalScrollFactor();
        }

        public float getHorizontalScrollFactor() {
            return WebView.this.getHorizontalScrollFactor();
        }

        public void setMeasuredDimension(int measuredWidth, int measuredHeight) {
            WebView.this.setMeasuredDimension(measuredWidth, measuredHeight);
        }

        public void onScrollChanged(int l, int t, int oldl, int oldt) {
            WebView.this.onScrollChanged(l, t, oldl, oldt);
        }

        public int getHorizontalScrollbarHeight() {
            return WebView.this.getHorizontalScrollbarHeight();
        }

        public void super_onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
                int l, int t, int r, int b) {
            WebView.super.onDrawVerticalScrollBar(canvas, scrollBar, l, t, r, b);
        }

        // ---- Access to (non-public) fields ----
        
Raw setter for the scroll X value, without invoking onScrollChanged handlers etc. 
/** Raw setter for the scroll X value, without invoking onScrollChanged handlers etc. */
        public void setScrollXRaw(int scrollX) {
            WebView.this.mScrollX = scrollX;
        }

        
Raw setter for the scroll Y value, without invoking onScrollChanged handlers etc. 
/** Raw setter for the scroll Y value, without invoking onScrollChanged handlers etc. */
        public void setScrollYRaw(int scrollY) {
            WebView.this.mScrollY = scrollY;
        }

    }

    //-------------------------------------------------------------------------
    // Package-private internal stuff
    //-------------------------------------------------------------------------

    // Only used by android.webkit.FindActionModeCallback.
    void setFindDialogFindListener(FindListener listener) {
        checkThread();
        setupFindListenerIfNeeded();
        mFindListener.mFindDialogFindListener = listener;
    }

    // Only used by android.webkit.FindActionModeCallback.
    void notifyFindDialogDismissed() {
        checkThread();
        mProvider.notifyFindDialogDismissed();
    }

    //-------------------------------------------------------------------------
    // Private internal stuff
    //-------------------------------------------------------------------------

    private WebViewProvider mProvider;

    
In addition to the FindListener that the user may set via the WebView.setFindListener
API, FindActionModeCallback will register it's own FindListener. We keep them separate
via this class so that the two FindListeners can potentially exist at once.

/**
     * In addition to the FindListener that the user may set via the WebView.setFindListener
     * API, FindActionModeCallback will register it's own FindListener. We keep them separate
     * via this class so that the two FindListeners can potentially exist at once.
     */
    private class FindListenerDistributor implements FindListener {
        private FindListener mFindDialogFindListener;
        private FindListener mUserFindListener;

        @Override
        public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches,
                boolean isDoneCounting) {
            if (mFindDialogFindListener != null) {
                mFindDialogFindListener.onFindResultReceived(activeMatchOrdinal, numberOfMatches,
                        isDoneCounting);
            }

            if (mUserFindListener != null) {
                mUserFindListener.onFindResultReceived(activeMatchOrdinal, numberOfMatches,
                        isDoneCounting);
            }
        }
    }
    private FindListenerDistributor mFindListener;

    private void setupFindListenerIfNeeded() {
        if (mFindListener == null) {
            mFindListener = new FindListenerDistributor();
            mProvider.setFindListener(mFindListener);
        }
    }

    private void ensureProviderCreated() {
        checkThread();
        if (mProvider == null) {
            // As this can get called during the base class constructor chain, pass the minimum
            // number of dependencies here; the rest are deferred to init().
            mProvider = getFactory().createWebView(this, new PrivateAccess());
        }
    }

    private static WebViewFactoryProvider getFactory() {
        return WebViewFactory.getProvider();
    }

    private final Looper mWebViewThread = Looper.myLooper();

    private void checkThread() {
        // Ignore mWebViewThread == null because this can be called during in the super class
        // constructor, before this class's own constructor has even started.
        if (mWebViewThread != null && Looper.myLooper() != mWebViewThread) {
            Throwable throwable = new Throwable(
                    "A WebView method was called on thread '" +
                    Thread.currentThread().getName() + "'. " +
                    "All WebView methods must be called on the same thread. " +
                    "(Expected Looper " + mWebViewThread + " called on " + Looper.myLooper() +
                    ", FYI main Looper is " + Looper.getMainLooper() + ")");
            Log.w(LOGTAG, Log.getStackTraceString(throwable));
            StrictMode.onWebViewMethodCalledOnWrongThread(throwable);

            if (sEnforceThreadChecking) {
                throw new RuntimeException(throwable);
            }
        }
    }

    //-------------------------------------------------------------------------
    // Override View methods
    //-------------------------------------------------------------------------

    // TODO: Add a test that enumerates all methods in ViewDelegte & ScrollDelegate, and ensures
    // there's a corresponding override (or better, caller) for each of them in here.

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        mProvider.getViewDelegate().onAttachedToWindow();
    }

    
@hide
/** @hide */
    @Override
    protected void onDetachedFromWindowInternal() {
        mProvider.getViewDelegate().onDetachedFromWindow();
        super.onDetachedFromWindowInternal();
    }

    
@hide
/** @hide */
    @Override
    public void onMovedToDisplay(int displayId, Configuration config) {
        mProvider.getViewDelegate().onMovedToDisplay(displayId, config);
    }

    @Override
    public void setLayoutParams(ViewGroup.LayoutParams params) {
        mProvider.getViewDelegate().setLayoutParams(params);
    }

    @Override
    public void setOverScrollMode(int mode) {
        super.setOverScrollMode(mode);
        // This method may be called in the constructor chain, before the WebView provider is
        // created.
        ensureProviderCreated();
        mProvider.getViewDelegate().setOverScrollMode(mode);
    }

    @Override
    public void setScrollBarStyle(int style) {
        mProvider.getViewDelegate().setScrollBarStyle(style);
        super.setScrollBarStyle(style);
    }

    @Override
    protected int computeHorizontalScrollRange() {
        return mProvider.getScrollDelegate().computeHorizontalScrollRange();
    }

    @Override
    protected int computeHorizontalScrollOffset() {
        return mProvider.getScrollDelegate().computeHorizontalScrollOffset();
    }

    @Override
    protected int computeVerticalScrollRange() {
        return mProvider.getScrollDelegate().computeVerticalScrollRange();
    }

    @Override
    protected int computeVerticalScrollOffset() {
        return mProvider.getScrollDelegate().computeVerticalScrollOffset();
    }

    @Override
    protected int computeVerticalScrollExtent() {
        return mProvider.getScrollDelegate().computeVerticalScrollExtent();
    }

    @Override
    public void computeScroll() {
        mProvider.getScrollDelegate().computeScroll();
    }

    @Override
    public boolean onHoverEvent(MotionEvent event) {
        return mProvider.getViewDelegate().onHoverEvent(event);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return mProvider.getViewDelegate().onTouchEvent(event);
    }

    @Override
    public boolean onGenericMotionEvent(MotionEvent event) {
        return mProvider.getViewDelegate().onGenericMotionEvent(event);
    }

    @Override
    public boolean onTrackballEvent(MotionEvent event) {
        return mProvider.getViewDelegate().onTrackballEvent(event);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return mProvider.getViewDelegate().onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        return mProvider.getViewDelegate().onKeyUp(keyCode, event);
    }

    @Override
    public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
        return mProvider.getViewDelegate().onKeyMultiple(keyCode, repeatCount, event);
    }

    /*
    TODO: These are not currently implemented in WebViewClassic, but it seems inconsistent not
    to be delegating them too.

    @Override
    public boolean onKeyPreIme(int keyCode, KeyEvent event) {
        return mProvider.getViewDelegate().onKeyPreIme(keyCode, event);
    }
    @Override
    public boolean onKeyLongPress(int keyCode, KeyEvent event) {
        return mProvider.getViewDelegate().onKeyLongPress(keyCode, event);
    }
    @Override
    public boolean onKeyShortcut(int keyCode, KeyEvent event) {
        return mProvider.getViewDelegate().onKeyShortcut(keyCode, event);
    }
    */

    @Override
    public AccessibilityNodeProvider getAccessibilityNodeProvider() {
        AccessibilityNodeProvider provider =
                mProvider.getViewDelegate().getAccessibilityNodeProvider();
        return provider == null ? super.getAccessibilityNodeProvider() : provider;
    }

    @Deprecated
    @Override
    public boolean shouldDelayChildPressedState() {
        return mProvider.getViewDelegate().shouldDelayChildPressedState();
    }

    @Override
    public CharSequence getAccessibilityClassName() {
        return WebView.class.getName();
    }

    @Override
    public void onProvideVirtualStructure(ViewStructure structure) {
        mProvider.getViewDelegate().onProvideVirtualStructure(structure);
    }

    
{@inheritDoc}

The ViewStructure traditionally represents a View, while for web pages it represent HTML nodes. Hence, it's necessary to "map" the HTML properties in a way that is understood by the AutofillService implementations: 
    
  
  1. Only the HTML nodes inside a FORM are generated. 
  2. The source of the HTML is set using ViewStructure.setWebDomain(String) in the node representing the WebView. 
  3. If a web page has multiple FORMs, only the data for the current form is represented—if the user taps a field from another form, then the current autofill context is canceled (by calling AutofillManager.cancel() and a new context is created for that FORM. 
  4. Similarly, if the page has IFRAME nodes, they are not initially represented in the view structure until the user taps a field from a FORM inside the IFRAME, in which case it would be treated the same way as multiple forms described above, except that the web domain of the FORM contains the src attribute from the IFRAME node. 
  5. The W3C autofill field (autocomplete tag attribute) maps to ViewStructure.setAutofillHints(String[]). 
  6. If the view is editable, the ViewStructure.setAutofillType(int) and ViewStructure.setAutofillValue(AutofillValue) must be set. 
  7. The placeholder attribute maps to ViewStructure.setHint(CharSequence). 
  8. Other HTML attributes can be represented through ViewStructure.setHtmlInfo(HtmlInfo). 


If the WebView implementation can determine that the value of a field was set statically (for example, not through Javascript), it should also call structure.setDataIsSensitive(false). 
For example, an HTML form with 2 fields for username and password:

   <label>Username:</label>
   <input type="text" name="username" id="user" value="Type your username" autocomplete="username" placeholder="Email or username">
   <label>Password:</label>
   <input type="password" name="password" id="pass" autocomplete="current-password" placeholder="Password">



Would map to:

    int index = structure.addChildCount(2);
    ViewStructure username = structure.newChild(index);
    username.setAutofillId(structure.getAutofillId(), 1); // id 1 - first child
    username.setAutofillHints("username");
    username.setHtmlInfo(username.newHtmlInfoBuilder("input")
        .addAttribute("type", "text")
        .addAttribute("name", "username")
        .addAttribute("label", "Username:")
        .build());
    username.setHint("Email or username");
    username.setAutofillType(View.AUTOFILL_TYPE_TEXT);
    username.setAutofillValue(AutofillValue.forText("Type your username"));
    // Value of the field is not sensitive because it was created statically and not changed.
    username.setDataIsSensitive(false);
    ViewStructure password = structure.newChild(index + 1);
    username.setAutofillId(structure, 2); // id 2 - second child
    password.setAutofillHints("current-password");
    password.setHtmlInfo(password.newHtmlInfoBuilder("input")
        .addAttribute("type", "password")
        .addAttribute("name", "password")
        .addAttribute("label", "Password:")
        .build());
    password.setHint("Password");
    password.setAutofillType(View.AUTOFILL_TYPE_TEXT);



/**
     * {@inheritDoc}
     *
     * <p>The {@link ViewStructure} traditionally represents a {@link View}, while for web pages
     * it represent HTML nodes. Hence, it's necessary to "map" the HTML properties in a way that is
     * understood by the {@link android.service.autofill.AutofillService} implementations:
     *
     * <ol>
     *   <li>Only the HTML nodes inside a {@code FORM} are generated.
     *   <li>The source of the HTML is set using {@link ViewStructure#setWebDomain(String)} in the
     *   node representing the WebView.
     *   <li>If a web page has multiple {@code FORM}s, only the data for the current form is
     *   represented&mdash;if the user taps a field from another form, then the current autofill
     *   context is canceled (by calling {@link android.view.autofill.AutofillManager#cancel()} and
     *   a new context is created for that {@code FORM}.
     *   <li>Similarly, if the page has {@code IFRAME} nodes, they are not initially represented in
     *   the view structure until the user taps a field from a {@code FORM} inside the
     *   {@code IFRAME}, in which case it would be treated the same way as multiple forms described
     *   above, except that the {@link ViewStructure#setWebDomain(String) web domain} of the
     *   {@code FORM} contains the {@code src} attribute from the {@code IFRAME} node.
     *   <li>The W3C autofill field ({@code autocomplete} tag attribute) maps to
     *   {@link ViewStructure#setAutofillHints(String[])}.
     *   <li>If the view is editable, the {@link ViewStructure#setAutofillType(int)} and
     *   {@link ViewStructure#setAutofillValue(AutofillValue)} must be set.
     *   <li>The {@code placeholder} attribute maps to {@link ViewStructure#setHint(CharSequence)}.
     *   <li>Other HTML attributes can be represented through
     *   {@link ViewStructure#setHtmlInfo(android.view.ViewStructure.HtmlInfo)}.
     * </ol>
     *
     * <p>If the WebView implementation can determine that the value of a field was set statically
     * (for example, not through Javascript), it should also call
     * {@code structure.setDataIsSensitive(false)}.
     *
     * <p>For example, an HTML form with 2 fields for username and password:
     *
     * <pre class="prettyprint">
     *    &lt;label&gt;Username:&lt;/label&gt;
     *    &lt;input type="text" name="username" id="user" value="Type your username" autocomplete="username" placeholder="Email or username"&gt;
     *    &lt;label&gt;Password:&lt;/label&gt;
     *    &lt;input type="password" name="password" id="pass" autocomplete="current-password" placeholder="Password"&gt;
     * </pre>
     *
     * <p>Would map to:
     *
     * <pre class="prettyprint">
     *     int index = structure.addChildCount(2);
     *     ViewStructure username = structure.newChild(index);
     *     username.setAutofillId(structure.getAutofillId(), 1); // id 1 - first child
     *     username.setAutofillHints("username");
     *     username.setHtmlInfo(username.newHtmlInfoBuilder("input")
     *         .addAttribute("type", "text")
     *         .addAttribute("name", "username")
     *         .addAttribute("label", "Username:")
     *         .build());
     *     username.setHint("Email or username");
     *     username.setAutofillType(View.AUTOFILL_TYPE_TEXT);
     *     username.setAutofillValue(AutofillValue.forText("Type your username"));
     *     // Value of the field is not sensitive because it was created statically and not changed.
     *     username.setDataIsSensitive(false);
     *
     *     ViewStructure password = structure.newChild(index + 1);
     *     username.setAutofillId(structure, 2); // id 2 - second child
     *     password.setAutofillHints("current-password");
     *     password.setHtmlInfo(password.newHtmlInfoBuilder("input")
     *         .addAttribute("type", "password")
     *         .addAttribute("name", "password")
     *         .addAttribute("label", "Password:")
     *         .build());
     *     password.setHint("Password");
     *     password.setAutofillType(View.AUTOFILL_TYPE_TEXT);
     * </pre>
     */
    @Override
    public void onProvideAutofillVirtualStructure(ViewStructure structure, int flags) {
        mProvider.getViewDelegate().onProvideAutofillVirtualStructure(structure, flags);
    }

    @Override
    public void autofill(SparseArray<AutofillValue>values) {
        mProvider.getViewDelegate().autofill(values);
    }

    @Override
    public boolean isVisibleToUserForAutofill(int virtualId) {
        return mProvider.getViewDelegate().isVisibleToUserForAutofill(virtualId);
    }

    
@hide
/** @hide */
    @Override
    public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
        super.onInitializeAccessibilityNodeInfoInternal(info);
        mProvider.getViewDelegate().onInitializeAccessibilityNodeInfo(info);
    }

    
@hide
/** @hide */
    @Override
    public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
        super.onInitializeAccessibilityEventInternal(event);
        mProvider.getViewDelegate().onInitializeAccessibilityEvent(event);
    }

    
@hide
/** @hide */
    @Override
    public boolean performAccessibilityActionInternal(int action, Bundle arguments) {
        return mProvider.getViewDelegate().performAccessibilityAction(action, arguments);
    }

    
@hide
/** @hide */
    @Override
    protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
            int l, int t, int r, int b) {
        mProvider.getViewDelegate().onDrawVerticalScrollBar(canvas, scrollBar, l, t, r, b);
    }

    @Override
    protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
        mProvider.getViewDelegate().onOverScrolled(scrollX, scrollY, clampedX, clampedY);
    }

    @Override
    protected void onWindowVisibilityChanged(int visibility) {
        super.onWindowVisibilityChanged(visibility);
        mProvider.getViewDelegate().onWindowVisibilityChanged(visibility);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        mProvider.getViewDelegate().onDraw(canvas);
    }

    @Override
    public boolean performLongClick() {
        return mProvider.getViewDelegate().performLongClick();
    }

    @Override
    protected void onConfigurationChanged(Configuration newConfig) {
        mProvider.getViewDelegate().onConfigurationChanged(newConfig);
    }

    
Creates a new InputConnection for an InputMethod to interact with the WebView. This is similar to View.onCreateInputConnection but note that WebView calls InputConnection methods on a thread other than the UI thread. If these methods are overridden, then the overriding methods should respect thread restrictions when calling View methods or accessing data. 
/**
     * Creates a new InputConnection for an InputMethod to interact with the WebView.
     * This is similar to {@link View#onCreateInputConnection} but note that WebView
     * calls InputConnection methods on a thread other than the UI thread.
     * If these methods are overridden, then the overriding methods should respect
     * thread restrictions when calling View methods or accessing data.
     */
    @Override
    public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
        return mProvider.getViewDelegate().onCreateInputConnection(outAttrs);
    }

    @Override
    public boolean onDragEvent(DragEvent event) {
        return mProvider.getViewDelegate().onDragEvent(event);
    }

    @Override
    protected void onVisibilityChanged(View changedView, int visibility) {
        super.onVisibilityChanged(changedView, visibility);
        // This method may be called in the constructor chain, before the WebView provider is
        // created.
        ensureProviderCreated();
        mProvider.getViewDelegate().onVisibilityChanged(changedView, visibility);
    }

    @Override
    public void onWindowFocusChanged(boolean hasWindowFocus) {
        mProvider.getViewDelegate().onWindowFocusChanged(hasWindowFocus);
        super.onWindowFocusChanged(hasWindowFocus);
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        mProvider.getViewDelegate().onFocusChanged(focused, direction, previouslyFocusedRect);
        super.onFocusChanged(focused, direction, previouslyFocusedRect);
    }

    
@hide
/** @hide */
    @Override
    protected boolean setFrame(int left, int top, int right, int bottom) {
        return mProvider.getViewDelegate().setFrame(left, top, right, bottom);
    }

    @Override
    protected void onSizeChanged(int w, int h, int ow, int oh) {
        super.onSizeChanged(w, h, ow, oh);
        mProvider.getViewDelegate().onSizeChanged(w, h, ow, oh);
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        mProvider.getViewDelegate().onScrollChanged(l, t, oldl, oldt);
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        return mProvider.getViewDelegate().dispatchKeyEvent(event);
    }

    @Override
    public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
        return mProvider.getViewDelegate().requestFocus(direction, previouslyFocusedRect);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        mProvider.getViewDelegate().onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    public boolean requestChildRectangleOnScreen(View child, Rect rect, boolean immediate) {
        return mProvider.getViewDelegate().requestChildRectangleOnScreen(child, rect, immediate);
    }

    @Override
    public void setBackgroundColor(int color) {
        mProvider.getViewDelegate().setBackgroundColor(color);
    }

    @Override
    public void setLayerType(int layerType, Paint paint) {
        super.setLayerType(layerType, paint);
        mProvider.getViewDelegate().setLayerType(layerType, paint);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        mProvider.getViewDelegate().preDispatchDraw(canvas);
        super.dispatchDraw(canvas);
    }

    @Override
    public void onStartTemporaryDetach() {
        super.onStartTemporaryDetach();
        mProvider.getViewDelegate().onStartTemporaryDetach();
    }

    @Override
    public void onFinishTemporaryDetach() {
        super.onFinishTemporaryDetach();
        mProvider.getViewDelegate().onFinishTemporaryDetach();
    }

    @Override
    public Handler getHandler() {
        return mProvider.getViewDelegate().getHandler(super.getHandler());
    }

    @Override
    public View findFocus() {
        return mProvider.getViewDelegate().findFocus(super.findFocus());
    }

    
If WebView has already been loaded into the current process this method will return the
package that was used to load it. Otherwise, the package that would be used if the WebView
was loaded right now will be returned; this does not cause WebView to be loaded, so this
information may become outdated at any time.
The WebView package changes either when the current WebView package is updated, disabled, or
uninstalled. It can also be changed through a Developer Setting.
If the WebView package changes, any app process that has loaded WebView will be killed. The
next time the app starts and loads WebView it will use the new WebView package instead.

Returns:the current WebView package, or null if there is none.
/**
     * If WebView has already been loaded into the current process this method will return the
     * package that was used to load it. Otherwise, the package that would be used if the WebView
     * was loaded right now will be returned; this does not cause WebView to be loaded, so this
     * information may become outdated at any time.
     * The WebView package changes either when the current WebView package is updated, disabled, or
     * uninstalled. It can also be changed through a Developer Setting.
     * If the WebView package changes, any app process that has loaded WebView will be killed. The
     * next time the app starts and loads WebView it will use the new WebView package instead.
     * @return the current WebView package, or {@code null} if there is none.
     */
    @Nullable
    public static PackageInfo getCurrentWebViewPackage() {
        PackageInfo webviewPackage = WebViewFactory.getLoadedPackageInfo();
        if (webviewPackage != null) {
            return webviewPackage;
        }

        IWebViewUpdateService service = WebViewFactory.getUpdateService();
        if (service == null) {
            return null;
        }
        try {
            return service.getCurrentWebViewPackage();
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }

    
Receive the result from a previous call to View.startActivityForResult(Intent, int). 
Params:
  • requestCode – The integer request code originally supplied to
                   startActivityForResult(), allowing you to identify who this
                   result came from.
  • resultCode – The integer result code returned by the child activity
                  through its setResult().
  • data – An Intent, which can return result data to the caller
              (various data can be attached to Intent "extras").
@hide
/**
     * Receive the result from a previous call to {@link #startActivityForResult(Intent, int)}.
     *
     * @param requestCode The integer request code originally supplied to
     *                    startActivityForResult(), allowing you to identify who this
     *                    result came from.
     * @param resultCode The integer result code returned by the child activity
     *                   through its setResult().
     * @param data An Intent, which can return result data to the caller
     *               (various data can be attached to Intent "extras").
     * @hide
     */
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        mProvider.getViewDelegate().onActivityResult(requestCode, resultCode, data);
    }

    @Override
    public boolean onCheckIsTextEditor() {
        return mProvider.getViewDelegate().onCheckIsTextEditor();
    }

    
@hide
/** @hide */
    @Override
    protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
        super.encodeProperties(encoder);

        checkThread();
        encoder.addProperty("webview:contentHeight", mProvider.getContentHeight());
        encoder.addProperty("webview:contentWidth", mProvider.getContentWidth());
        encoder.addProperty("webview:scale", mProvider.getScale());
        encoder.addProperty("webview:title", mProvider.getTitle());
        encoder.addProperty("webview:url", mProvider.getUrl());
        encoder.addProperty("webview:originalUrl", mProvider.getOriginalUrl());
    }
}