https://source.android.com/ 
public interface android.media.RemoteControlClient$OnPlaybackPositionUpdateListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.media.RemoteControlClient$OnPlaybackPositionUpdateListener
  super_class: java.lang.Object
{
  public abstract void onPlaybackPositionUpdate(long);
    descriptor: (J)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
               Name  Flags
      newPositionMs  
}
SourceFile: "RemoteControlClient.java"
NestHost: android.media.RemoteControlClient
InnerClasses:
  public abstract OnPlaybackPositionUpdateListener = android.media.RemoteControlClient$OnPlaybackPositionUpdateListener of android.media.RemoteControlClient