https://source.android.com/ 
public interface android.content.pm.PackageManagerInternal$ExternalSourcesPolicy
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.content.pm.PackageManagerInternal$ExternalSourcesPolicy
  super_class: java.lang.Object
{
  public static final int USER_TRUSTED;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 0

  public static final int USER_BLOCKED;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  public static final int USER_DEFAULT;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 2

  public abstract int getPackageTrustedToInstallApps(java.lang.String, int);
    descriptor: (Ljava/lang/String;I)I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
             Name  Flags
      packageName  
      uid          
}
SourceFile: "PackageManagerInternal.java"
NestHost: android.content.pm.PackageManagerInternal
InnerClasses:
  public abstract ExternalSourcesPolicy = android.content.pm.PackageManagerInternal$ExternalSourcesPolicy of android.content.pm.PackageManagerInternal