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A library jar that provides APIs for Applications written for the Google Android Platform.

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/*
 * Copyright (C) 2014 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.media.session;

import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ParceledListSlice;
import android.media.AudioAttributes;
import android.media.MediaDescription;
import android.media.MediaMetadata;
import android.media.Rating;
import android.media.VolumeProvider;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.RemoteException;
import android.os.ResultReceiver;
import android.os.UserHandle;
import android.service.media.MediaBrowserService;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.ref.WeakReference;
import java.util.List;

/**
 * Allows interaction with media controllers, volume keys, media buttons, and
 * transport controls.
 * 

* A MediaSession should be created when an app wants to publish media playback * information or handle media keys. In general an app only needs one session * for all playback, though multiple sessions can be created to provide finer * grain controls of media. *

* Once a session is created the owner of the session may pass its * {@link #getSessionToken() session token} to other processes to allow them to * create a {@link MediaController} to interact with the session. *

* To receive commands, media keys, and other events a {@link Callback} must be * set with {@link #setCallback(Callback)} and {@link #setActive(boolean) * setActive(true)} must be called. *

* When an app is finished performing playback it must call {@link #release()} * to clean up the session and notify any controllers. *

* MediaSession objects are thread safe. */ public final class MediaSession { private static final String TAG = "MediaSession"; /** * Set this flag on the session to indicate that it can handle media button * events. */ public static final int FLAG_HANDLES_MEDIA_BUTTONS = 1 << 0; /** * Set this flag on the session to indicate that it handles transport * control commands through its {@link Callback}. */ public static final int FLAG_HANDLES_TRANSPORT_CONTROLS = 1 << 1; /** * System only flag for a session that needs to have priority over all other * sessions. This flag ensures this session will receive media button events * regardless of the current ordering in the system. * * @hide */ public static final int FLAG_EXCLUSIVE_GLOBAL_PRIORITY = 1 << 16; /** @hide */ @Retention(RetentionPolicy.SOURCE) @IntDef(flag = true, value = { FLAG_HANDLES_MEDIA_BUTTONS, FLAG_HANDLES_TRANSPORT_CONTROLS, FLAG_EXCLUSIVE_GLOBAL_PRIORITY }) public @interface SessionFlags { } private final Object mLock = new Object(); private final int mMaxBitmapSize; private final MediaSession.Token mSessionToken; private final MediaController mController; private final ISession mBinder; private final CallbackStub mCbStub; private CallbackMessageHandler mCallback; private VolumeProvider mVolumeProvider; private PlaybackState mPlaybackState; private boolean mActive = false; /** * Creates a new session. The session will automatically be registered with * the system but will not be published until {@link #setActive(boolean) * setActive(true)} is called. You must call {@link #release()} when * finished with the session. * * @param context The context to use to create the session. * @param tag A short name for debugging purposes. */ public MediaSession(@NonNull Context context, @NonNull String tag) { this(context, tag, UserHandle.myUserId()); } /** * Creates a new session as the specified user. To create a session as a * user other than your own you must hold the * {@link android.Manifest.permission#INTERACT_ACROSS_USERS_FULL} * permission. * * @param context The context to use to create the session. * @param tag A short name for debugging purposes. * @param userId The user id to create the session as. * @hide */ public MediaSession(@NonNull Context context, @NonNull String tag, int userId) { if (context == null) { throw new IllegalArgumentException("context cannot be null."); } if (TextUtils.isEmpty(tag)) { throw new IllegalArgumentException("tag cannot be null or empty"); } mMaxBitmapSize = context.getResources().getDimensionPixelSize( com.android.internal.R.dimen.config_mediaMetadataBitmapMaxSize); mCbStub = new CallbackStub(this); MediaSessionManager manager = (MediaSessionManager) context .getSystemService(Context.MEDIA_SESSION_SERVICE); try { mBinder = manager.createSession(mCbStub, tag, userId); mSessionToken = new Token(mBinder.getController()); mController = new MediaController(context, mSessionToken); } catch (RemoteException e) { throw new RuntimeException("Remote error creating session.", e); } } /** * Set the callback to receive updates for the MediaSession. This includes * media button events and transport controls. The caller's thread will be * used to post updates. *

* Set the callback to null to stop receiving updates. * * @param callback The callback object */ public void setCallback(@Nullable Callback callback) { setCallback(callback, null); } /** * Set the callback to receive updates for the MediaSession. This includes * media button events and transport controls. *

* Set the callback to null to stop receiving updates. * * @param callback The callback to receive updates on. * @param handler The handler that events should be posted on. */ public void setCallback(@Nullable Callback callback, @Nullable Handler handler) { synchronized (mLock) { if (callback == null) { if (mCallback != null) { mCallback.mCallback.mSession = null; } mCallback = null; return; } if (mCallback != null) { // We're updating the callback, clear the session from the old // one. mCallback.mCallback.mSession = null; } if (handler == null) { handler = new Handler(); } callback.mSession = this; CallbackMessageHandler msgHandler = new CallbackMessageHandler(handler.getLooper(), callback); mCallback = msgHandler; } } /** * Set an intent for launching UI for this Session. This can be used as a * quick link to an ongoing media screen. The intent should be for an * activity that may be started using {@link Activity#startActivity(Intent)}. * * @param pi The intent to launch to show UI for this Session. */ public void setSessionActivity(@Nullable PendingIntent pi) { try { mBinder.setLaunchPendingIntent(pi); } catch (RemoteException e) { Log.wtf(TAG, "Failure in setLaunchPendingIntent.", e); } } /** * Set a pending intent for your media button receiver to allow restarting * playback after the session has been stopped. If your app is started in * this way an {@link Intent#ACTION_MEDIA_BUTTON} intent will be sent via * the pending intent. * * @param mbr The {@link PendingIntent} to send the media button event to. */ public void setMediaButtonReceiver(@Nullable PendingIntent mbr) { try { mBinder.setMediaButtonReceiver(mbr); } catch (RemoteException e) { Log.wtf(TAG, "Failure in setMediaButtonReceiver.", e); } } /** * Set any flags for the session. * * @param flags The flags to set for this session. */ public void setFlags(@SessionFlags int flags) { try { mBinder.setFlags(flags); } catch (RemoteException e) { Log.wtf(TAG, "Failure in setFlags.", e); } } /** * Set the attributes for this session's audio. This will affect the * system's volume handling for this session. If * {@link #setPlaybackToRemote} was previously called it will stop receiving * volume commands and the system will begin sending volume changes to the * appropriate stream. *

* By default sessions use attributes for media. * * @param attributes The {@link AudioAttributes} for this session's audio. */ public void setPlaybackToLocal(AudioAttributes attributes) { if (attributes == null) { throw new IllegalArgumentException("Attributes cannot be null for local playback."); } try { mBinder.setPlaybackToLocal(attributes); } catch (RemoteException e) { Log.wtf(TAG, "Failure in setPlaybackToLocal.", e); } } /** * Configure this session to use remote volume handling. This must be called * to receive volume button events, otherwise the system will adjust the * appropriate stream volume for this session. If * {@link #setPlaybackToLocal} was previously called the system will stop * handling volume changes for this session and pass them to the volume * provider instead. * * @param volumeProvider The provider that will handle volume changes. May * not be null. */ public void setPlaybackToRemote(@NonNull VolumeProvider volumeProvider) { if (volumeProvider == null) { throw new IllegalArgumentException("volumeProvider may not be null!"); } synchronized (mLock) { mVolumeProvider = volumeProvider; } volumeProvider.setCallback(new VolumeProvider.Callback() { @Override public void onVolumeChanged(VolumeProvider volumeProvider) { notifyRemoteVolumeChanged(volumeProvider); } }); try { mBinder.setPlaybackToRemote(volumeProvider.getVolumeControl(), volumeProvider.getMaxVolume()); mBinder.setCurrentVolume(volumeProvider.getCurrentVolume()); } catch (RemoteException e) { Log.wtf(TAG, "Failure in setPlaybackToRemote.", e); } } /** * Set if this session is currently active and ready to receive commands. If * set to false your session's controller may not be discoverable. You must * set the session to active before it can start receiving media button * events or transport commands. * * @param active Whether this session is active or not. */ public void setActive(boolean active) { if (mActive == active) { return; } try { mBinder.setActive(active); mActive = active; } catch (RemoteException e) { Log.wtf(TAG, "Failure in setActive.", e); } } /** * Get the current active state of this session. * * @return True if the session is active, false otherwise. */ public boolean isActive() { return mActive; } /** * Send a proprietary event to all MediaControllers listening to this * Session. It's up to the Controller/Session owner to determine the meaning * of any events. * * @param event The name of the event to send * @param extras Any extras included with the event */ public void sendSessionEvent(@NonNull String event, @Nullable Bundle extras) { if (TextUtils.isEmpty(event)) { throw new IllegalArgumentException("event cannot be null or empty"); } try { mBinder.sendEvent(event, extras); } catch (RemoteException e) { Log.wtf(TAG, "Error sending event", e); } } /** * This must be called when an app has finished performing playback. If * playback is expected to start again shortly the session can be left open, * but it must be released if your activity or service is being destroyed. */ public void release() { try { mBinder.destroy(); } catch (RemoteException e) { Log.wtf(TAG, "Error releasing session: ", e); } } /** * Retrieve a token object that can be used by apps to create a * {@link MediaController} for interacting with this session. The owner of * the session is responsible for deciding how to distribute these tokens. * * @return A token that can be used to create a MediaController for this * session */ public @NonNull Token getSessionToken() { return mSessionToken; } /** * Get a controller for this session. This is a convenience method to avoid * having to cache your own controller in process. * * @return A controller for this session. */ public @NonNull MediaController getController() { return mController; } /** * Update the current playback state. * * @param state The current state of playback */ public void setPlaybackState(@Nullable PlaybackState state) { mPlaybackState = state; try { mBinder.setPlaybackState(state); } catch (RemoteException e) { Log.wtf(TAG, "Dead object in setPlaybackState.", e); } } /** * Update the current metadata. New metadata can be created using * {@link android.media.MediaMetadata.Builder}. * * @param metadata The new metadata */ public void setMetadata(@Nullable MediaMetadata metadata) { if (metadata != null ) { metadata = (new MediaMetadata.Builder(metadata, mMaxBitmapSize)).build(); } try { mBinder.setMetadata(metadata); } catch (RemoteException e) { Log.wtf(TAG, "Dead object in setPlaybackState.", e); } } /** * Update the list of items in the play queue. It is an ordered list and * should contain the current item, and previous or upcoming items if they * exist. Specify null if there is no current play queue. *

* The queue should be of reasonable size. If the play queue is unbounded * within your app, it is better to send a reasonable amount in a sliding * window instead. * * @param queue A list of items in the play queue. */ public void setQueue(@Nullable List queue) { try { mBinder.setQueue(queue == null ? null : new ParceledListSlice(queue)); } catch (RemoteException e) { Log.wtf("Dead object in setQueue.", e); } } /** * Set the title of the play queue. The UI should display this title along * with the play queue itself. * e.g. "Play Queue", "Now Playing", or an album name. * * @param title The title of the play queue. */ public void setQueueTitle(@Nullable CharSequence title) { try { mBinder.setQueueTitle(title); } catch (RemoteException e) { Log.wtf("Dead object in setQueueTitle.", e); } } /** * Set the style of rating used by this session. Apps trying to set the * rating should use this style. Must be one of the following: *

    *
  • {@link Rating#RATING_NONE}
  • *
  • {@link Rating#RATING_3_STARS}
  • *
  • {@link Rating#RATING_4_STARS}
  • *
  • {@link Rating#RATING_5_STARS}
  • *
  • {@link Rating#RATING_HEART}
  • *
  • {@link Rating#RATING_PERCENTAGE}
  • *
  • {@link Rating#RATING_THUMB_UP_DOWN}
  • *
*/ public void setRatingType(int type) { try { mBinder.setRatingType(type); } catch (RemoteException e) { Log.e(TAG, "Error in setRatingType.", e); } } /** * Set some extras that can be associated with the {@link MediaSession}. No assumptions should * be made as to how a {@link MediaController} will handle these extras. * Keys should be fully qualified (e.g. com.example.MY_EXTRA) to avoid conflicts. * * @param extras The extras associated with the {@link MediaSession}. */ public void setExtras(@Nullable Bundle extras) { try { mBinder.setExtras(extras); } catch (RemoteException e) { Log.wtf("Dead object in setExtras.", e); } } /** * Notify the system that the remote volume changed. * * @param provider The provider that is handling volume changes. * @hide */ public void notifyRemoteVolumeChanged(VolumeProvider provider) { synchronized (mLock) { if (provider == null || provider != mVolumeProvider) { Log.w(TAG, "Received update from stale volume provider"); return; } } try { mBinder.setCurrentVolume(provider.getCurrentVolume()); } catch (RemoteException e) { Log.e(TAG, "Error in notifyVolumeChanged", e); } } private void dispatchPlay() { postToCallback(CallbackMessageHandler.MSG_PLAY); } private void dispatchPlayFromMediaId(String mediaId, Bundle extras) { postToCallback(CallbackMessageHandler.MSG_PLAY_MEDIA_ID, mediaId, extras); } private void dispatchPlayFromSearch(String query, Bundle extras) { postToCallback(CallbackMessageHandler.MSG_PLAY_SEARCH, query, extras); } private void dispatchSkipToItem(long id) { postToCallback(CallbackMessageHandler.MSG_SKIP_TO_ITEM, id); } private void dispatchPause() { postToCallback(CallbackMessageHandler.MSG_PAUSE); } private void dispatchStop() { postToCallback(CallbackMessageHandler.MSG_STOP); } private void dispatchNext() { postToCallback(CallbackMessageHandler.MSG_NEXT); } private void dispatchPrevious() { postToCallback(CallbackMessageHandler.MSG_PREVIOUS); } private void dispatchFastForward() { postToCallback(CallbackMessageHandler.MSG_FAST_FORWARD); } private void dispatchRewind() { postToCallback(CallbackMessageHandler.MSG_REWIND); } private void dispatchSeekTo(long pos) { postToCallback(CallbackMessageHandler.MSG_SEEK_TO, pos); } private void dispatchRate(Rating rating) { postToCallback(CallbackMessageHandler.MSG_RATE, rating); } private void dispatchCustomAction(String action, Bundle args) { postToCallback(CallbackMessageHandler.MSG_CUSTOM_ACTION, action, args); } private void dispatchMediaButton(Intent mediaButtonIntent) { postToCallback(CallbackMessageHandler.MSG_MEDIA_BUTTON, mediaButtonIntent); } private void dispatchAdjustVolume(int direction) { postToCallback(CallbackMessageHandler.MSG_ADJUST_VOLUME, direction); } private void dispatchSetVolumeTo(int volume) { postToCallback(CallbackMessageHandler.MSG_SET_VOLUME, volume); } private void postToCallback(int what) { postToCallback(what, null); } private void postCommand(String command, Bundle args, ResultReceiver resultCb) { Command cmd = new Command(command, args, resultCb); postToCallback(CallbackMessageHandler.MSG_COMMAND, cmd); } private void postToCallback(int what, Object obj) { postToCallback(what, obj, null); } private void postToCallback(int what, Object obj, Bundle extras) { synchronized (mLock) { if (mCallback != null) { mCallback.post(what, obj, extras); } } } /** * Return true if this is considered an active playback state. * * @hide */ public static boolean isActiveState(int state) { switch (state) { case PlaybackState.STATE_FAST_FORWARDING: case PlaybackState.STATE_REWINDING: case PlaybackState.STATE_SKIPPING_TO_PREVIOUS: case PlaybackState.STATE_SKIPPING_TO_NEXT: case PlaybackState.STATE_BUFFERING: case PlaybackState.STATE_CONNECTING: case PlaybackState.STATE_PLAYING: return true; } return false; } /** * Represents an ongoing session. This may be passed to apps by the session * owner to allow them to create a {@link MediaController} to communicate with * the session. */ public static final class Token implements Parcelable { private ISessionController mBinder; /** * @hide */ public Token(ISessionController binder) { mBinder = binder; } @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel dest, int flags) { dest.writeStrongBinder(mBinder.asBinder()); } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((mBinder == null) ? 0 : mBinder.asBinder().hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Token other = (Token) obj; if (mBinder == null) { if (other.mBinder != null) return false; } else if (!mBinder.asBinder().equals(other.mBinder.asBinder())) return false; return true; } ISessionController getBinder() { return mBinder; } public static final Parcelable.Creator CREATOR = new Parcelable.Creator() { @Override public Token createFromParcel(Parcel in) { return new Token(ISessionController.Stub.asInterface(in.readStrongBinder())); } @Override public Token[] newArray(int size) { return new Token[size]; } }; } /** * Receives media buttons, transport controls, and commands from controllers * and the system. A callback may be set using {@link #setCallback}. */ public abstract static class Callback { private MediaSession mSession; public Callback() { } /** * Called when a controller has sent a command to this session. * The owner of the session may handle custom commands but is not * required to. * * @param command The command name. * @param args Optional parameters for the command, may be null. * @param cb A result receiver to which a result may be sent by the command, may be null. */ public void onCommand(@NonNull String command, @Nullable Bundle args, @Nullable ResultReceiver cb) { } /** * Called when a media button is pressed and this session has the * highest priority or a controller sends a media button event to the * session. The default behavior will call the relevant method if the * action for it was set. *

* The intent will be of type {@link Intent#ACTION_MEDIA_BUTTON} with a * KeyEvent in {@link Intent#EXTRA_KEY_EVENT} * * @param mediaButtonIntent an intent containing the KeyEvent as an * extra * @return True if the event was handled, false otherwise. */ public boolean onMediaButtonEvent(@NonNull Intent mediaButtonIntent) { if (mSession != null && Intent.ACTION_MEDIA_BUTTON.equals(mediaButtonIntent.getAction())) { KeyEvent ke = mediaButtonIntent.getParcelableExtra(Intent.EXTRA_KEY_EVENT); if (ke != null && ke.getAction() == KeyEvent.ACTION_DOWN) { PlaybackState state = mSession.mPlaybackState; long validActions = state == null ? 0 : state.getActions(); switch (ke.getKeyCode()) { case KeyEvent.KEYCODE_MEDIA_PLAY: if ((validActions & PlaybackState.ACTION_PLAY) != 0) { onPlay(); return true; } break; case KeyEvent.KEYCODE_MEDIA_PAUSE: if ((validActions & PlaybackState.ACTION_PAUSE) != 0) { onPause(); return true; } break; case KeyEvent.KEYCODE_MEDIA_NEXT: if ((validActions & PlaybackState.ACTION_SKIP_TO_NEXT) != 0) { onSkipToNext(); return true; } break; case KeyEvent.KEYCODE_MEDIA_PREVIOUS: if ((validActions & PlaybackState.ACTION_SKIP_TO_PREVIOUS) != 0) { onSkipToPrevious(); return true; } break; case KeyEvent.KEYCODE_MEDIA_STOP: if ((validActions & PlaybackState.ACTION_STOP) != 0) { onStop(); return true; } break; case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD: if ((validActions & PlaybackState.ACTION_FAST_FORWARD) != 0) { onFastForward(); return true; } break; case KeyEvent.KEYCODE_MEDIA_REWIND: if ((validActions & PlaybackState.ACTION_REWIND) != 0) { onRewind(); return true; } break; case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE: case KeyEvent.KEYCODE_HEADSETHOOK: boolean isPlaying = state == null ? false : state.getState() == PlaybackState.STATE_PLAYING; boolean canPlay = (validActions & (PlaybackState.ACTION_PLAY_PAUSE | PlaybackState.ACTION_PLAY)) != 0; boolean canPause = (validActions & (PlaybackState.ACTION_PLAY_PAUSE | PlaybackState.ACTION_PAUSE)) != 0; if (isPlaying && canPause) { onPause(); return true; } else if (!isPlaying && canPlay) { onPlay(); return true; } break; } } } return false; } /** * Override to handle requests to begin playback. */ public void onPlay() { } /** * Override to handle requests to play a specific mediaId that was * provided by your app's {@link MediaBrowserService}. */ public void onPlayFromMediaId(String mediaId, Bundle extras) { } /** * Override to handle requests to begin playback from a search query. An * empty query indicates that the app may play any music. The * implementation should attempt to make a smart choice about what to * play. */ public void onPlayFromSearch(String query, Bundle extras) { } /** * Override to handle requests to play an item with a given id from the * play queue. */ public void onSkipToQueueItem(long id) { } /** * Override to handle requests to pause playback. */ public void onPause() { } /** * Override to handle requests to skip to the next media item. */ public void onSkipToNext() { } /** * Override to handle requests to skip to the previous media item. */ public void onSkipToPrevious() { } /** * Override to handle requests to fast forward. */ public void onFastForward() { } /** * Override to handle requests to rewind. */ public void onRewind() { } /** * Override to handle requests to stop playback. */ public void onStop() { } /** * Override to handle requests to seek to a specific position in ms. * * @param pos New position to move to, in milliseconds. */ public void onSeekTo(long pos) { } /** * Override to handle the item being rated. * * @param rating */ public void onSetRating(@NonNull Rating rating) { } /** * Called when a {@link MediaController} wants a {@link PlaybackState.CustomAction} to be * performed. * * @param action The action that was originally sent in the * {@link PlaybackState.CustomAction}. * @param extras Optional extras specified by the {@link MediaController}. */ public void onCustomAction(@NonNull String action, @Nullable Bundle extras) { } } /** * @hide */ public static class CallbackStub extends ISessionCallback.Stub { private WeakReference mMediaSession; public CallbackStub(MediaSession session) { mMediaSession = new WeakReference(session); } @Override public void onCommand(String command, Bundle args, ResultReceiver cb) { MediaSession session = mMediaSession.get(); if (session != null) { session.postCommand(command, args, cb); } } @Override public void onMediaButton(Intent mediaButtonIntent, int sequenceNumber, ResultReceiver cb) { MediaSession session = mMediaSession.get(); try { if (session != null) { session.dispatchMediaButton(mediaButtonIntent); } } finally { if (cb != null) { cb.send(sequenceNumber, null); } } } @Override public void onPlay() { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchPlay(); } } @Override public void onPlayFromMediaId(String mediaId, Bundle extras) { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchPlayFromMediaId(mediaId, extras); } } @Override public void onPlayFromSearch(String query, Bundle extras) { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchPlayFromSearch(query, extras); } } @Override public void onSkipToTrack(long id) { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchSkipToItem(id); } } @Override public void onPause() { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchPause(); } } @Override public void onStop() { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchStop(); } } @Override public void onNext() { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchNext(); } } @Override public void onPrevious() { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchPrevious(); } } @Override public void onFastForward() { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchFastForward(); } } @Override public void onRewind() { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchRewind(); } } @Override public void onSeekTo(long pos) { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchSeekTo(pos); } } @Override public void onRate(Rating rating) { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchRate(rating); } } @Override public void onCustomAction(String action, Bundle args) { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchCustomAction(action, args); } } @Override public void onAdjustVolume(int direction) { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchAdjustVolume(direction); } } @Override public void onSetVolumeTo(int value) { MediaSession session = mMediaSession.get(); if (session != null) { session.dispatchSetVolumeTo(value); } } } /** * A single item that is part of the play queue. It contains a description * of the item and its id in the queue. */ public static final class QueueItem implements Parcelable { /** * This id is reserved. No items can be explicitly asigned this id. */ public static final int UNKNOWN_ID = -1; private final MediaDescription mDescription; private final long mId; /** * Create a new {@link MediaSession.QueueItem}. * * @param description The {@link MediaDescription} for this item. * @param id An identifier for this item. It must be unique within the * play queue and cannot be {@link #UNKNOWN_ID}. */ public QueueItem(MediaDescription description, long id) { if (description == null) { throw new IllegalArgumentException("Description cannot be null."); } if (id == UNKNOWN_ID) { throw new IllegalArgumentException("Id cannot be QueueItem.UNKNOWN_ID"); } mDescription = description; mId = id; } private QueueItem(Parcel in) { mDescription = MediaDescription.CREATOR.createFromParcel(in); mId = in.readLong(); } /** * Get the description for this item. */ public MediaDescription getDescription() { return mDescription; } /** * Get the queue id for this item. */ public long getQueueId() { return mId; } @Override public void writeToParcel(Parcel dest, int flags) { mDescription.writeToParcel(dest, flags); dest.writeLong(mId); } @Override public int describeContents() { return 0; } public static final Creator CREATOR = new Creator() { @Override public MediaSession.QueueItem createFromParcel(Parcel p) { return new MediaSession.QueueItem(p); } @Override public MediaSession.QueueItem[] newArray(int size) { return new MediaSession.QueueItem[size]; } }; @Override public String toString() { return "MediaSession.QueueItem {" + "Description=" + mDescription + ", Id=" + mId + " }"; } } private static final class Command { public final String command; public final Bundle extras; public final ResultReceiver stub; public Command(String command, Bundle extras, ResultReceiver stub) { this.command = command; this.extras = extras; this.stub = stub; } } private class CallbackMessageHandler extends Handler { private static final int MSG_PLAY = 1; private static final int MSG_PLAY_MEDIA_ID = 2; private static final int MSG_PLAY_SEARCH = 3; private static final int MSG_SKIP_TO_ITEM = 4; private static final int MSG_PAUSE = 5; private static final int MSG_STOP = 6; private static final int MSG_NEXT = 7; private static final int MSG_PREVIOUS = 8; private static final int MSG_FAST_FORWARD = 9; private static final int MSG_REWIND = 10; private static final int MSG_SEEK_TO = 11; private static final int MSG_RATE = 12; private static final int MSG_CUSTOM_ACTION = 13; private static final int MSG_MEDIA_BUTTON = 14; private static final int MSG_COMMAND = 15; private static final int MSG_ADJUST_VOLUME = 16; private static final int MSG_SET_VOLUME = 17; private MediaSession.Callback mCallback; public CallbackMessageHandler(Looper looper, MediaSession.Callback callback) { super(looper, null, true); mCallback = callback; } public void post(int what, Object obj, Bundle bundle) { Message msg = obtainMessage(what, obj); msg.setData(bundle); msg.sendToTarget(); } public void post(int what, Object obj) { obtainMessage(what, obj).sendToTarget(); } public void post(int what) { post(what, null); } public void post(int what, Object obj, int arg1) { obtainMessage(what, arg1, 0, obj).sendToTarget(); } @Override public void handleMessage(Message msg) { VolumeProvider vp; switch (msg.what) { case MSG_PLAY: mCallback.onPlay(); break; case MSG_PLAY_MEDIA_ID: mCallback.onPlayFromMediaId((String) msg.obj, msg.getData()); break; case MSG_PLAY_SEARCH: mCallback.onPlayFromSearch((String) msg.obj, msg.getData()); break; case MSG_SKIP_TO_ITEM: mCallback.onSkipToQueueItem((Long) msg.obj); break; case MSG_PAUSE: mCallback.onPause(); break; case MSG_STOP: mCallback.onStop(); break; case MSG_NEXT: mCallback.onSkipToNext(); break; case MSG_PREVIOUS: mCallback.onSkipToPrevious(); break; case MSG_FAST_FORWARD: mCallback.onFastForward(); break; case MSG_REWIND: mCallback.onRewind(); break; case MSG_SEEK_TO: mCallback.onSeekTo((Long) msg.obj); break; case MSG_RATE: mCallback.onSetRating((Rating) msg.obj); break; case MSG_CUSTOM_ACTION: mCallback.onCustomAction((String) msg.obj, msg.getData()); break; case MSG_MEDIA_BUTTON: mCallback.onMediaButtonEvent((Intent) msg.obj); break; case MSG_COMMAND: Command cmd = (Command) msg.obj; mCallback.onCommand(cmd.command, cmd.extras, cmd.stub); break; case MSG_ADJUST_VOLUME: synchronized (mLock) { vp = mVolumeProvider; } if (vp != null) { vp.onAdjustVolume((int) msg.obj); } break; case MSG_SET_VOLUME: synchronized (mLock) { vp = mVolumeProvider; } if (vp != null) { vp.onSetVolumeTo((int) msg.obj); } break; } } } }





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