/**
* This class provides a MediaBrowser through a service. It exposes the media library to a browsing
* client, through the onGetRoot and onLoadChildren methods. It also creates a MediaSession and
* exposes it through its MediaSession.Token, which allows the client to create a MediaController
* that connects to and send control commands to the MediaSession remotely. This is useful for user
* interfaces that need to interact with your media session, like Android Auto. You can (should)
* also use the same service from your app's UI, which gives a seamless playback experience to the
* user.
*
* <p>To implement a MediaBrowserService, you need to:
*
* <ul>
* <li>Extend {@link android.service.media.MediaBrowserService}, implementing the media browsing
* related methods {@link android.service.media.MediaBrowserService#onGetRoot} and {@link
* android.service.media.MediaBrowserService#onLoadChildren};
* <li>In onCreate, start a new {@link android.media.session.MediaSession} and notify its parent
* with the session's token {@link android.service.media.MediaBrowserService#setSessionToken};
* <li>Set a callback on the {@link
* android.media.session.MediaSession#setCallback(android.media.session.MediaSession.Callback)}.
* The callback will receive all the user's actions, like play, pause, etc;
* <li>Handle all the actual music playing using any method your app prefers (for example, {@link
* android.media.MediaPlayer})
* <li>Update playbackState, "now playing" metadata and queue, using MediaSession proper methods
* {@link
* android.media.session.MediaSession#setPlaybackState(android.media.session.PlaybackState)}
* {@link android.media.session.MediaSession#setMetadata(android.media.MediaMetadata)} and
* {@link android.media.session.MediaSession#setQueue(java.util.List)})
* <li>Declare and export the service in AndroidManifest with an intent receiver for the action
* android.media.browse.MediaBrowserService
* </ul>
*
* To make your app compatible with Android Auto, you also need to:
*
* <ul>
* <li>Declare a meta-data tag in AndroidManifest.xml linking to a xml resource with a
* <automotiveApp> root element. For a media app, this must include an <uses
* name="media"/> element as a child. For example, in AndroidManifest.xml: <meta-data
* android:name="com.google.android.gms.car.application"
* android:resource="@xml/automotive_app_desc"/> And in res/values/automotive_app_desc.xml:
* <automotiveApp> <uses name="media"/> </automotiveApp>
* </ul>
*
* @see <a href="README.md">README.md</a> for more details.
*/
public class MusicService extends MediaBrowserService implements Playback.Callback {
// Extra on MediaSession that contains the Cast device name currently connected to
public static final String EXTRA_CONNECTED_CAST = "com.example.android.uamp.CAST_NAME";
// The action of the incoming Intent indicating that it contains a command
// to be executed (see {@link #onStartCommand})
public static final String ACTION_CMD = "com.example.android.uamp.ACTION_CMD";
// The key in the extras of the incoming Intent indicating the command that
// should be executed (see {@link #onStartCommand})
public static final String CMD_NAME = "CMD_NAME";
// A value of a CMD_NAME key in the extras of the incoming Intent that
// indicates that the music playback should be paused (see {@link #onStartCommand})
public static final String CMD_PAUSE = "CMD_PAUSE";
// A value of a CMD_NAME key that indicates that the music playback should switch
// to local playback from cast playback.
public static final String CMD_STOP_CASTING = "CMD_STOP_CASTING";
private static final String TAG = LogHelper.makeLogTag(MusicService.class);
// Action to thumbs up a media item
private static final String CUSTOM_ACTION_THUMBS_UP = "com.example.android.uamp.THUMBS_UP";
// Delay stopSelf by using a handler.
private static final int STOP_DELAY = 30000;
// Music catalog manager
private MusicProvider mMusicProvider;
private MediaSession mSession;
// "Now playing" queue:
private List<MediaSession.QueueItem> mPlayingQueue;
private int mCurrentIndexOnQueue;
// Current local media player state
private MediaNotificationManager mMediaNotificationManager;
// Indicates whether the service was started.
private boolean mServiceStarted;
private Bundle mSessionExtras;
private DelayedStopHandler mDelayedStopHandler = new DelayedStopHandler(this);
private Playback mPlayback;
private MediaRouter mMediaRouter;
private PackageValidator mPackageValidator;
/**
* Consumer responsible for switching the Playback instances depending on whether it is connected
* to a remote player.
*/
private final VideoCastConsumerImpl mCastConsumer =
new VideoCastConsumerImpl() {
@Override
public void onApplicationConnected(
ApplicationMetadata appMetadata, String sessionId, boolean wasLaunched) {
// In case we are casting, send the device name as an extra on MediaSession metadata.
mSessionExtras.putString(EXTRA_CONNECTED_CAST, mCastManager.getDeviceName());
mSession.setExtras(mSessionExtras);
// Now we can switch to CastPlayback
Playback playback = new CastPlayback(MusicService.this, mMusicProvider);
mMediaRouter.setMediaSession(mSession);
switchToPlayer(playback, true);
}
@Override
public void onDisconnected() {
LogHelper.d(TAG, "onDisconnected");
mSessionExtras.remove(EXTRA_CONNECTED_CAST);
mSession.setExtras(mSessionExtras);
Playback playback = new LocalPlayback(MusicService.this, mMusicProvider);
mMediaRouter.setMediaSession(null);
switchToPlayer(playback, false);
}
};
private VideoCastManager mCastManager;
/*
* (non-Javadoc)
* @see android.app.Service#onCreate()
*/
@Override
public void onCreate() {
super.onCreate();
LogHelper.d(TAG, "onCreate");
mPlayingQueue = new ArrayList<>();
mMusicProvider = new MusicProvider();
mPackageValidator = new PackageValidator(this);
// Start a new MediaSession
mSession = new MediaSession(this, "MusicService");
setSessionToken(mSession.getSessionToken());
mSession.setCallback(new MediaSessionCallback());
mSession.setFlags(
MediaSession.FLAG_HANDLES_MEDIA_BUTTONS | MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS);
mPlayback = new LocalPlayback(this, mMusicProvider);
mPlayback.setState(PlaybackState.STATE_NONE);
mPlayback.setCallback(this);
mPlayback.start();
Context context = getApplicationContext();
Intent intent = new Intent(context, NowPlayingActivity.class);
PendingIntent pi =
PendingIntent.getActivity(
context, 99 /*request code*/, intent, PendingIntent.FLAG_UPDATE_CURRENT);
mSession.setSessionActivity(pi);
mSessionExtras = new Bundle();
CarHelper.setSlotReservationFlags(mSessionExtras, true, true, true);
mSession.setExtras(mSessionExtras);
updatePlaybackState(null);
mMediaNotificationManager = new MediaNotificationManager(this);
mCastManager = ((UAMPApplication) getApplication()).getCastManager(getApplicationContext());
mCastManager.addVideoCastConsumer(mCastConsumer);
mMediaRouter = MediaRouter.getInstance(getApplicationContext());
}
/**
* (non-Javadoc)
*
* @see android.app.Service#onStartCommand(android.content.Intent, int, int)
*/
@Override
public int onStartCommand(Intent startIntent, int flags, int startId) {
if (startIntent != null) {
String action = startIntent.getAction();
String command = startIntent.getStringExtra(CMD_NAME);
if (ACTION_CMD.equals(action)) {
if (CMD_PAUSE.equals(command)) {
if (mPlayback != null && mPlayback.isPlaying()) {
handlePauseRequest();
}
} else if (CMD_STOP_CASTING.equals(command)) {
mCastManager.disconnect();
}
}
}
return START_STICKY;
}
/**
* (non-Javadoc)
*
* @see android.app.Service#onDestroy()
*/
@Override
public void onDestroy() {
LogHelper.d(TAG, "onDestroy");
// Service is being killed, so make sure we release our resources
handleStopRequest(null);
mCastManager = ((UAMPApplication) getApplication()).getCastManager(getApplicationContext());
mCastManager.removeVideoCastConsumer(mCastConsumer);
mDelayedStopHandler.removeCallbacksAndMessages(null);
// Always release the MediaSession to clean up resources
// and notify associated MediaController(s).
mSession.release();
}
@Override
public BrowserRoot onGetRoot(String clientPackageName, int clientUid, Bundle rootHints) {
LogHelper.d(
TAG,
"OnGetRoot: clientPackageName=" + clientPackageName,
"; clientUid=" + clientUid + " ; rootHints=",
rootHints);
// To ensure you are not allowing any arbitrary app to browse your app's contents, you
// need to check the origin:
if (!mPackageValidator.isCallerAllowed(this, clientPackageName, clientUid)) {
// If the request comes from an untrusted package, return null. No further calls will
// be made to other media browsing methods.
LogHelper.w(TAG, "OnGetRoot: IGNORING request from untrusted package " + clientPackageName);
return null;
}
//noinspection StatementWithEmptyBody
if (CarHelper.isValidCarPackage(clientPackageName)) {
// Optional: if your app needs to adapt ads, music library or anything else that
// needs to run differently when connected to the car, this is where you should handle
// it.
}
return new BrowserRoot(MEDIA_ID_ROOT, null);
}
@Override
public void onLoadChildren(final String parentMediaId, final Result<List<MediaItem>> result) {
if (!mMusicProvider.isInitialized()) {
// Use result.detach to allow calling result.sendResult from another thread:
result.detach();
mMusicProvider.retrieveMediaAsync(
new MusicProvider.Callback() {
@Override
public void onMusicCatalogReady(boolean success) {
if (success) {
loadChildrenImpl(parentMediaId, result);
} else {
updatePlaybackState(getString(R.string.error_no_metadata));
result.sendResult(Collections.<MediaItem>emptyList());
}
}
});
} else {
// If our music catalog is already loaded/cached, load them into result immediately
loadChildrenImpl(parentMediaId, result);
}
}
/**
* Actual implementation of onLoadChildren that assumes that MusicProvider is already initialized.
*/
private void loadChildrenImpl(
final String parentMediaId, final Result<List<MediaBrowser.MediaItem>> result) {
LogHelper.d(TAG, "OnLoadChildren: parentMediaId=", parentMediaId);
List<MediaBrowser.MediaItem> mediaItems = new ArrayList<>();
if (MEDIA_ID_ROOT.equals(parentMediaId)) {
LogHelper.d(TAG, "OnLoadChildren.ROOT");
mediaItems.add(
new MediaBrowser.MediaItem(
new MediaDescription.Builder()
.setMediaId(MEDIA_ID_MUSICS_BY_GENRE)
.setTitle(getString(R.string.browse_genres))
.setIconUri(
Uri.parse(
"android.resource://" + "com.example.android.uamp/drawable/ic_by_genre"))
.setSubtitle(getString(R.string.browse_genre_subtitle))
.build(),
MediaBrowser.MediaItem.FLAG_BROWSABLE));
} else if (MEDIA_ID_MUSICS_BY_GENRE.equals(parentMediaId)) {
LogHelper.d(TAG, "OnLoadChildren.GENRES");
for (String genre : mMusicProvider.getGenres()) {
MediaBrowser.MediaItem item =
new MediaBrowser.MediaItem(
new MediaDescription.Builder()
.setMediaId(createBrowseCategoryMediaID(MEDIA_ID_MUSICS_BY_GENRE, genre))
.setTitle(genre)
.setSubtitle(getString(R.string.browse_musics_by_genre_subtitle, genre))
.build(),
MediaBrowser.MediaItem.FLAG_BROWSABLE);
mediaItems.add(item);
}
} else if (parentMediaId.startsWith(MEDIA_ID_MUSICS_BY_GENRE)) {
String genre = MediaIDHelper.getHierarchy(parentMediaId)[1];
LogHelper.d(TAG, "OnLoadChildren.SONGS_BY_GENRE genre=", genre);
for (MediaMetadata track : mMusicProvider.getMusicsByGenre(genre)) {
// Since mediaMetadata fields are immutable, we need to create a copy, so we
// can set a hierarchy-aware mediaID. We will need to know the media hierarchy
// when we get a onPlayFromMusicID call, so we can create the proper queue based
// on where the music was selected from (by artist, by genre, random, etc)
String hierarchyAwareMediaID =
MediaIDHelper.createMediaID(
track.getDescription().getMediaId(), MEDIA_ID_MUSICS_BY_GENRE, genre);
MediaMetadata trackCopy =
new MediaMetadata.Builder(track)
.putString(MediaMetadata.METADATA_KEY_MEDIA_ID, hierarchyAwareMediaID)
.build();
MediaBrowser.MediaItem bItem =
new MediaBrowser.MediaItem(trackCopy.getDescription(), MediaItem.FLAG_PLAYABLE);
mediaItems.add(bItem);
}
} else {
LogHelper.w(TAG, "Skipping unmatched parentMediaId: ", parentMediaId);
}
LogHelper.d(TAG, "OnLoadChildren sending ", mediaItems.size(), " results for ", parentMediaId);
result.sendResult(mediaItems);
}
private final class MediaSessionCallback extends MediaSession.Callback {
@Override
public void onPlay() {
LogHelper.d(TAG, "play");
if (mPlayingQueue == null || mPlayingQueue.isEmpty()) {
mPlayingQueue = QueueHelper.getRandomQueue(mMusicProvider);
mSession.setQueue(mPlayingQueue);
mSession.setQueueTitle(getString(R.string.random_queue_title));
// start playing from the beginning of the queue
mCurrentIndexOnQueue = 0;
}
if (mPlayingQueue != null && !mPlayingQueue.isEmpty()) {
handlePlayRequest();
}
}
@Override
public void onSkipToQueueItem(long queueId) {
LogHelper.d(TAG, "OnSkipToQueueItem:" + queueId);
if (mPlayingQueue != null && !mPlayingQueue.isEmpty()) {
// set the current index on queue from the music Id:
mCurrentIndexOnQueue = QueueHelper.getMusicIndexOnQueue(mPlayingQueue, queueId);
// play the music
handlePlayRequest();
}
}
@Override
public void onSeekTo(long position) {
LogHelper.d(TAG, "onSeekTo:", position);
mPlayback.seekTo((int) position);
}
@Override
public void onPlayFromMediaId(String mediaId, Bundle extras) {
LogHelper.d(TAG, "playFromMediaId mediaId:", mediaId, " extras=", extras);
// The mediaId used here is not the unique musicId. This one comes from the
// MediaBrowser, and is actually a "hierarchy-aware mediaID": a concatenation of
// the hierarchy in MediaBrowser and the actual unique musicID. This is necessary
// so we can build the correct playing queue, based on where the track was
// selected from.
mPlayingQueue = QueueHelper.getPlayingQueue(mediaId, mMusicProvider);
mSession.setQueue(mPlayingQueue);
String queueTitle =
getString(
R.string.browse_musics_by_genre_subtitle,
MediaIDHelper.extractBrowseCategoryValueFromMediaID(mediaId));
mSession.setQueueTitle(queueTitle);
if (mPlayingQueue != null && !mPlayingQueue.isEmpty()) {
// set the current index on queue from the media Id:
mCurrentIndexOnQueue = QueueHelper.getMusicIndexOnQueue(mPlayingQueue, mediaId);
if (mCurrentIndexOnQueue < 0) {
LogHelper.e(
TAG,
"playFromMediaId: media ID ",
mediaId,
" could not be found on queue. Ignoring.");
} else {
// play the music
handlePlayRequest();
}
}
}
@Override
public void onPause() {
LogHelper.d(TAG, "pause. current state=" + mPlayback.getState());
handlePauseRequest();
}
@Override
public void onStop() {
LogHelper.d(TAG, "stop. current state=" + mPlayback.getState());
handleStopRequest(null);
}
@Override
public void onSkipToNext() {
LogHelper.d(TAG, "skipToNext");
mCurrentIndexOnQueue++;
if (mPlayingQueue != null && mCurrentIndexOnQueue >= mPlayingQueue.size()) {
// This sample's behavior: skipping to next when in last song returns to the
// first song.
mCurrentIndexOnQueue = 0;
}
if (QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
handlePlayRequest();
} else {
LogHelper.e(
TAG,
"skipToNext: cannot skip to next. next Index="
+ mCurrentIndexOnQueue
+ " queue length="
+ (mPlayingQueue == null ? "null" : mPlayingQueue.size()));
handleStopRequest("Cannot skip");
}
}
@Override
public void onSkipToPrevious() {
LogHelper.d(TAG, "skipToPrevious");
mCurrentIndexOnQueue--;
if (mPlayingQueue != null && mCurrentIndexOnQueue < 0) {
// This sample's behavior: skipping to previous when in first song restarts the
// first song.
mCurrentIndexOnQueue = 0;
}
if (QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
handlePlayRequest();
} else {
LogHelper.e(
TAG,
"skipToPrevious: cannot skip to previous. previous Index="
+ mCurrentIndexOnQueue
+ " queue length="
+ (mPlayingQueue == null ? "null" : mPlayingQueue.size()));
handleStopRequest("Cannot skip");
}
}
@Override
public void onCustomAction(String action, Bundle extras) {
if (CUSTOM_ACTION_THUMBS_UP.equals(action)) {
LogHelper.i(TAG, "onCustomAction: favorite for current track");
MediaMetadata track = getCurrentPlayingMusic();
if (track != null) {
String musicId = track.getString(MediaMetadata.METADATA_KEY_MEDIA_ID);
mMusicProvider.setFavorite(musicId, !mMusicProvider.isFavorite(musicId));
}
// playback state needs to be updated because the "Favorite" icon on the
// custom action will change to reflect the new favorite state.
updatePlaybackState(null);
} else {
LogHelper.e(TAG, "Unsupported action: ", action);
}
}
@Override
public void onPlayFromSearch(String query, Bundle extras) {
LogHelper.d(TAG, "playFromSearch query=", query);
mPlayingQueue = QueueHelper.getPlayingQueueFromSearch(query, mMusicProvider);
LogHelper.d(TAG, "playFromSearch playqueue.length=" + mPlayingQueue.size());
mSession.setQueue(mPlayingQueue);
if (mPlayingQueue != null && !mPlayingQueue.isEmpty()) {
// start playing from the beginning of the queue
mCurrentIndexOnQueue = 0;
handlePlayRequest();
}
}
}
/** Handle a request to play music */
private void handlePlayRequest() {
LogHelper.d(TAG, "handlePlayRequest: mState=" + mPlayback.getState());
mDelayedStopHandler.removeCallbacksAndMessages(null);
if (!mServiceStarted) {
LogHelper.v(TAG, "Starting service");
// The MusicService needs to keep running even after the calling MediaBrowser
// is disconnected. Call startService(Intent) and then stopSelf(..) when we no longer
// need to play media.
startService(new Intent(getApplicationContext(), MusicService.class));
mServiceStarted = true;
}
if (!mSession.isActive()) {
mSession.setActive(true);
}
if (QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
updateMetadata();
mPlayback.play(mPlayingQueue.get(mCurrentIndexOnQueue));
}
}
/** Handle a request to pause music */
private void handlePauseRequest() {
LogHelper.d(TAG, "handlePauseRequest: mState=" + mPlayback.getState());
mPlayback.pause();
// reset the delayed stop handler.
mDelayedStopHandler.removeCallbacksAndMessages(null);
mDelayedStopHandler.sendEmptyMessageDelayed(0, STOP_DELAY);
}
/** Handle a request to stop music */
private void handleStopRequest(String withError) {
LogHelper.d(TAG, "handleStopRequest: mState=" + mPlayback.getState() + " error=", withError);
mPlayback.stop(true);
// reset the delayed stop handler.
mDelayedStopHandler.removeCallbacksAndMessages(null);
mDelayedStopHandler.sendEmptyMessageDelayed(0, STOP_DELAY);
updatePlaybackState(withError);
// service is no longer necessary. Will be started again if needed.
stopSelf();
mServiceStarted = false;
}
private void updateMetadata() {
if (!QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
LogHelper.e(TAG, "Can't retrieve current metadata.");
updatePlaybackState(getResources().getString(R.string.error_no_metadata));
return;
}
MediaSession.QueueItem queueItem = mPlayingQueue.get(mCurrentIndexOnQueue);
String musicId =
MediaIDHelper.extractMusicIDFromMediaID(queueItem.getDescription().getMediaId());
MediaMetadata track = mMusicProvider.getMusic(musicId);
final String trackId = track.getString(MediaMetadata.METADATA_KEY_MEDIA_ID);
if (!musicId.equals(trackId)) {
IllegalStateException e = new IllegalStateException("track ID should match musicId.");
LogHelper.e(
TAG,
"track ID should match musicId.",
" musicId=",
musicId,
" trackId=",
trackId,
" mediaId from queueItem=",
queueItem.getDescription().getMediaId(),
" title from queueItem=",
queueItem.getDescription().getTitle(),
" mediaId from track=",
track.getDescription().getMediaId(),
" title from track=",
track.getDescription().getTitle(),
" source.hashcode from track=",
track.getString(MusicProvider.CUSTOM_METADATA_TRACK_SOURCE).hashCode(),
e);
throw e;
}
LogHelper.d(TAG, "Updating metadata for MusicID= " + musicId);
mSession.setMetadata(track);
// Set the proper album artwork on the media session, so it can be shown in the
// locked screen and in other places.
if (track.getDescription().getIconBitmap() == null
&& track.getDescription().getIconUri() != null) {
String albumUri = track.getDescription().getIconUri().toString();
AlbumArtCache.getInstance()
.fetch(
albumUri,
new AlbumArtCache.FetchListener() {
@Override
public void onFetched(String artUrl, Bitmap bitmap, Bitmap icon) {
MediaSession.QueueItem queueItem = mPlayingQueue.get(mCurrentIndexOnQueue);
MediaMetadata track = mMusicProvider.getMusic(trackId);
track =
new MediaMetadata.Builder(track)
// set high resolution bitmap in METADATA_KEY_ALBUM_ART. This is used, for
// example, on the lockscreen background when the media session is active.
.putBitmap(MediaMetadata.METADATA_KEY_ALBUM_ART, bitmap)
// set small version of the album art in the DISPLAY_ICON. This is used on
// the MediaDescription and thus it should be small to be serialized if
// necessary..
.putBitmap(MediaMetadata.METADATA_KEY_DISPLAY_ICON, icon)
.build();
MediaDescription md;
mMusicProvider.updateMusic(trackId, track);
// If we are still playing the same music
String currentPlayingId =
MediaIDHelper.extractMusicIDFromMediaID(
queueItem.getDescription().getMediaId());
if (trackId.equals(currentPlayingId)) {
mSession.setMetadata(track);
}
}
});
}
}
/**
* Update the current media player state, optionally showing an error message.
*
* @param error if not null, error message to present to the user.
*/
private void updatePlaybackState(String error) {
LogHelper.d(TAG, "updatePlaybackState, playback state=" + mPlayback.getState());
long position = PlaybackState.PLAYBACK_POSITION_UNKNOWN;
if (mPlayback != null && mPlayback.isConnected()) {
position = mPlayback.getCurrentStreamPosition();
}
PlaybackState.Builder stateBuilder =
new PlaybackState.Builder().setActions(getAvailableActions());
setCustomAction(stateBuilder);
int state = mPlayback.getState();
// If there is an error message, send it to the playback state:
if (error != null) {
// Error states are really only supposed to be used for errors that cause playback to
// stop unexpectedly and persist until the user takes action to fix it.
stateBuilder.setErrorMessage(error);
state = PlaybackState.STATE_ERROR;
}
stateBuilder.setState(state, position, 1.0f, SystemClock.elapsedRealtime());
// Set the activeQueueItemId if the current index is valid.
if (QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
MediaSession.QueueItem item = mPlayingQueue.get(mCurrentIndexOnQueue);
stateBuilder.setActiveQueueItemId(item.getQueueId());
}
mSession.setPlaybackState(stateBuilder.build());
if (state == PlaybackState.STATE_PLAYING || state == PlaybackState.STATE_PAUSED) {
mMediaNotificationManager.startNotification();
}
}
private void setCustomAction(PlaybackState.Builder stateBuilder) {
MediaMetadata currentMusic = getCurrentPlayingMusic();
if (currentMusic != null) {
// Set appropriate "Favorite" icon on Custom action:
String musicId = currentMusic.getString(MediaMetadata.METADATA_KEY_MEDIA_ID);
int favoriteIcon = R.drawable.ic_star_off;
if (mMusicProvider.isFavorite(musicId)) {
favoriteIcon = R.drawable.ic_star_on;
}
LogHelper.d(
TAG,
"updatePlaybackState, setting Favorite custom action of music ",
musicId,
" current favorite=",
mMusicProvider.isFavorite(musicId));
stateBuilder.addCustomAction(
CUSTOM_ACTION_THUMBS_UP, getString(R.string.favorite), favoriteIcon);
}
}
private long getAvailableActions() {
long actions =
PlaybackState.ACTION_PLAY
| PlaybackState.ACTION_PLAY_FROM_MEDIA_ID
| PlaybackState.ACTION_PLAY_FROM_SEARCH;
if (mPlayingQueue == null || mPlayingQueue.isEmpty()) {
return actions;
}
if (mPlayback.isPlaying()) {
actions |= PlaybackState.ACTION_PAUSE;
}
if (mCurrentIndexOnQueue > 0) {
actions |= PlaybackState.ACTION_SKIP_TO_PREVIOUS;
}
if (mCurrentIndexOnQueue < mPlayingQueue.size() - 1) {
actions |= PlaybackState.ACTION_SKIP_TO_NEXT;
}
return actions;
}
private MediaMetadata getCurrentPlayingMusic() {
if (QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
MediaSession.QueueItem item = mPlayingQueue.get(mCurrentIndexOnQueue);
if (item != null) {
LogHelper.d(TAG, "getCurrentPlayingMusic for musicId=", item.getDescription().getMediaId());
return mMusicProvider.getMusic(
MediaIDHelper.extractMusicIDFromMediaID(item.getDescription().getMediaId()));
}
}
return null;
}
/** Implementation of the Playback.Callback interface */
@Override
public void onCompletion() {
// The media player finished playing the current song, so we go ahead
// and start the next.
if (mPlayingQueue != null && !mPlayingQueue.isEmpty()) {
// In this sample, we restart the playing queue when it gets to the end:
mCurrentIndexOnQueue++;
if (mCurrentIndexOnQueue >= mPlayingQueue.size()) {
mCurrentIndexOnQueue = 0;
}
handlePlayRequest();
} else {
// If there is nothing to play, we stop and release the resources:
handleStopRequest(null);
}
}
@Override
public void onPlaybackStatusChanged(int state) {
updatePlaybackState(null);
}
@Override
public void onError(String error) {
updatePlaybackState(error);
}
@Override
public void onMetadataChanged(String mediaId) {
LogHelper.d(TAG, "onMetadataChanged", mediaId);
List<MediaSession.QueueItem> queue = QueueHelper.getPlayingQueue(mediaId, mMusicProvider);
int index = QueueHelper.getMusicIndexOnQueue(queue, mediaId);
if (index > -1) {
mCurrentIndexOnQueue = index;
mPlayingQueue = queue;
updateMetadata();
}
}
/**
* Helper to switch to a different Playback instance
*
* @param playback switch to this playback
*/
private void switchToPlayer(Playback playback, boolean resumePlaying) {
if (playback == null) {
throw new IllegalArgumentException("Playback cannot be null");
}
// suspend the current one.
int oldState = mPlayback.getState();
int pos = mPlayback.getCurrentStreamPosition();
String currentMediaId = mPlayback.getCurrentMediaId();
LogHelper.d(TAG, "Current position from " + playback + " is ", pos);
mPlayback.stop(false);
playback.setCallback(this);
playback.setCurrentStreamPosition(pos < 0 ? 0 : pos);
playback.setCurrentMediaId(currentMediaId);
playback.start();
// finally swap the instance
mPlayback = playback;
switch (oldState) {
case PlaybackState.STATE_BUFFERING:
case PlaybackState.STATE_CONNECTING:
case PlaybackState.STATE_PAUSED:
mPlayback.pause();
break;
case PlaybackState.STATE_PLAYING:
if (resumePlaying && QueueHelper.isIndexPlayable(mCurrentIndexOnQueue, mPlayingQueue)) {
mPlayback.play(mPlayingQueue.get(mCurrentIndexOnQueue));
} else if (!resumePlaying) {
mPlayback.pause();
} else {
mPlayback.stop(true);
}
break;
case PlaybackState.STATE_NONE:
break;
default:
LogHelper.d(TAG, "Default called. Old state is ", oldState);
}
}
/** A simple handler that stops the service if playback is not active (playing) */
private static class DelayedStopHandler extends Handler {
private final WeakReference<MusicService> mWeakReference;
private DelayedStopHandler(MusicService service) {
mWeakReference = new WeakReference<>(service);
}
@Override
public void handleMessage(Message msg) {
MusicService service = mWeakReference.get();
if (service != null && service.mPlayback != null) {
if (service.mPlayback.isPlaying()) {
LogHelper.d(TAG, "Ignoring delayed stop since the media player is in use.");
return;
}
LogHelper.d(TAG, "Stopping service with delay handler.");
service.stopSelf();
service.mServiceStarted = false;
}
}
}
}
/** Utility class to get a list of MusicTrack's based on a server-side JSON configuration. */
public class MusicProvider {
private static final String TAG = LogHelper.makeLogTag(MusicProvider.class);
private static final String CATALOG_URL =
"http://storage.googleapis.com/automotive-media/music.json";
public static final String CUSTOM_METADATA_TRACK_SOURCE = "__SOURCE__";
private static final String JSON_MUSIC = "music";
private static final String JSON_TITLE = "title";
private static final String JSON_ALBUM = "album";
private static final String JSON_ARTIST = "artist";
private static final String JSON_GENRE = "genre";
private static final String JSON_SOURCE = "source";
private static final String JSON_IMAGE = "image";
private static final String JSON_TRACK_NUMBER = "trackNumber";
private static final String JSON_TOTAL_TRACK_COUNT = "totalTrackCount";
private static final String JSON_DURATION = "duration";
// Categorized caches for music track data:
private ConcurrentMap<String, List<MediaMetadata>> mMusicListByGenre;
private final ConcurrentMap<String, MutableMediaMetadata> mMusicListById;
private final Set<String> mFavoriteTracks;
enum State {
NON_INITIALIZED,
INITIALIZING,
INITIALIZED
}
private volatile State mCurrentState = State.NON_INITIALIZED;
public interface Callback {
void onMusicCatalogReady(boolean success);
}
public MusicProvider() {
mMusicListByGenre = new ConcurrentHashMap<>();
mMusicListById = new ConcurrentHashMap<>();
mFavoriteTracks = Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>());
}
/**
* Get an iterator over the list of genres
*
* @return genres
*/
public Iterable<String> getGenres() {
if (mCurrentState != State.INITIALIZED) {
return Collections.emptyList();
}
return mMusicListByGenre.keySet();
}
/** Get music tracks of the given genre */
public Iterable<MediaMetadata> getMusicsByGenre(String genre) {
if (mCurrentState != State.INITIALIZED || !mMusicListByGenre.containsKey(genre)) {
return Collections.emptyList();
}
return mMusicListByGenre.get(genre);
}
/**
* Very basic implementation of a search that filter music tracks which title containing the given
* query.
*/
public Iterable<MediaMetadata> searchMusic(String titleQuery) {
if (mCurrentState != State.INITIALIZED) {
return Collections.emptyList();
}
ArrayList<MediaMetadata> result = new ArrayList<>();
titleQuery = titleQuery.toLowerCase();
for (MutableMediaMetadata track : mMusicListById.values()) {
if (track
.metadata
.getString(MediaMetadata.METADATA_KEY_TITLE)
.toLowerCase()
.contains(titleQuery)) {
result.add(track.metadata);
}
}
return result;
}
/**
* Return the MediaMetadata for the given musicID.
*
* @param musicId The unique, non-hierarchical music ID.
*/
public MediaMetadata getMusic(String musicId) {
return mMusicListById.containsKey(musicId) ? mMusicListById.get(musicId).metadata : null;
}
public synchronized void updateMusic(String musicId, MediaMetadata metadata) {
MutableMediaMetadata track = mMusicListById.get(musicId);
if (track == null) {
return;
}
String oldGenre = track.metadata.getString(MediaMetadata.METADATA_KEY_GENRE);
String newGenre = metadata.getString(MediaMetadata.METADATA_KEY_GENRE);
track.metadata = metadata;
// if genre has changed, we need to rebuild the list by genre
if (!oldGenre.equals(newGenre)) {
buildListsByGenre();
}
}
public void setFavorite(String musicId, boolean favorite) {
if (favorite) {
mFavoriteTracks.add(musicId);
} else {
mFavoriteTracks.remove(musicId);
}
}
public boolean isFavorite(String musicId) {
return mFavoriteTracks.contains(musicId);
}
public boolean isInitialized() {
return mCurrentState == State.INITIALIZED;
}
/**
* Get the list of music tracks from a server and caches the track information for future
* reference, keying tracks by musicId and grouping by genre.
*/
public void retrieveMediaAsync(final Callback callback) {
LogHelper.d(TAG, "retrieveMediaAsync called");
if (mCurrentState == State.INITIALIZED) {
// Nothing to do, execute callback immediately
callback.onMusicCatalogReady(true);
return;
}
// Asynchronously load the music catalog in a separate thread
new AsyncTask<Void, Void, State>() {
@Override
protected State doInBackground(Void... params) {
retrieveMedia();
return mCurrentState;
}
@Override
protected void onPostExecute(State current) {
if (callback != null) {
callback.onMusicCatalogReady(current == State.INITIALIZED);
}
}
}.execute();
}
private synchronized void buildListsByGenre() {
ConcurrentMap<String, List<MediaMetadata>> newMusicListByGenre = new ConcurrentHashMap<>();
for (MutableMediaMetadata m : mMusicListById.values()) {
String genre = m.metadata.getString(MediaMetadata.METADATA_KEY_GENRE);
List<MediaMetadata> list = newMusicListByGenre.get(genre);
if (list == null) {
list = new ArrayList<>();
newMusicListByGenre.put(genre, list);
}
list.add(m.metadata);
}
mMusicListByGenre = newMusicListByGenre;
}
private synchronized void retrieveMedia() {
try {
if (mCurrentState == State.NON_INITIALIZED) {
mCurrentState = State.INITIALIZING;
int slashPos = CATALOG_URL.lastIndexOf('/');
String path = CATALOG_URL.substring(0, slashPos + 1);
JSONObject jsonObj = fetchJSONFromUrl(CATALOG_URL);
if (jsonObj == null) {
return;
}
JSONArray tracks = jsonObj.getJSONArray(JSON_MUSIC);
if (tracks != null) {
for (int j = 0; j < tracks.length(); j++) {
MediaMetadata item = buildFromJSON(tracks.getJSONObject(j), path);
String musicId = item.getString(MediaMetadata.METADATA_KEY_MEDIA_ID);
mMusicListById.put(musicId, new MutableMediaMetadata(musicId, item));
}
buildListsByGenre();
}
mCurrentState = State.INITIALIZED;
}
} catch (JSONException e) {
LogHelper.e(TAG, e, "Could not retrieve music list");
} finally {
if (mCurrentState != State.INITIALIZED) {
// Something bad happened, so we reset state to NON_INITIALIZED to allow
// retries (eg if the network connection is temporary unavailable)
mCurrentState = State.NON_INITIALIZED;
}
}
}
private MediaMetadata buildFromJSON(JSONObject json, String basePath) throws JSONException {
String title = json.getString(JSON_TITLE);
String album = json.getString(JSON_ALBUM);
String artist = json.getString(JSON_ARTIST);
String genre = json.getString(JSON_GENRE);
String source = json.getString(JSON_SOURCE);
String iconUrl = json.getString(JSON_IMAGE);
int trackNumber = json.getInt(JSON_TRACK_NUMBER);
int totalTrackCount = json.getInt(JSON_TOTAL_TRACK_COUNT);
int duration = json.getInt(JSON_DURATION) * 1000; // ms
LogHelper.d(TAG, "Found music track: ", json);
// Media is stored relative to JSON file
if (!source.startsWith("http")) {
source = basePath + source;
}
if (!iconUrl.startsWith("http")) {
iconUrl = basePath + iconUrl;
}
// Since we don't have a unique ID in the server, we fake one using the hashcode of
// the music source. In a real world app, this could come from the server.
String id = String.valueOf(source.hashCode());
// Adding the music source to the MediaMetadata (and consequently using it in the
// mediaSession.setMetadata) is not a good idea for a real world music app, because
// the session metadata can be accessed by notification listeners. This is done in this
// sample for convenience only.
return new MediaMetadata.Builder()
.putString(MediaMetadata.METADATA_KEY_MEDIA_ID, id)
.putString(CUSTOM_METADATA_TRACK_SOURCE, source)
.putString(MediaMetadata.METADATA_KEY_ALBUM, album)
.putString(MediaMetadata.METADATA_KEY_ARTIST, artist)
.putLong(MediaMetadata.METADATA_KEY_DURATION, duration)
.putString(MediaMetadata.METADATA_KEY_GENRE, genre)
.putString(MediaMetadata.METADATA_KEY_ALBUM_ART_URI, iconUrl)
.putString(MediaMetadata.METADATA_KEY_TITLE, title)
.putLong(MediaMetadata.METADATA_KEY_TRACK_NUMBER, trackNumber)
.putLong(MediaMetadata.METADATA_KEY_NUM_TRACKS, totalTrackCount)
.build();
}
/**
* Download a JSON file from a server, parse the content and return the JSON object.
*
* @return result JSONObject containing the parsed representation.
*/
private JSONObject fetchJSONFromUrl(String urlString) {
InputStream is = null;
try {
URL url = new URL(urlString);
URLConnection urlConnection = url.openConnection();
is = new BufferedInputStream(urlConnection.getInputStream());
BufferedReader reader =
new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "iso-8859-1"));
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
return new JSONObject(sb.toString());
} catch (Exception e) {
LogHelper.e(TAG, "Failed to parse the json for media list", e);
return null;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// ignore
}
}
}
}
}
/** A class that shows the Media Queue to the user. */
public class PlaybackControlsFragment extends Fragment {
private static final String TAG = LogHelper.makeLogTag(PlaybackControlsFragment.class);
private ImageButton mPlayPause;
private TextView mTitle;
private TextView mSubtitle;
private TextView mExtraInfo;
private ImageView mAlbumArt;
private String mArtUrl;
// Receive callbacks from the MediaController. Here we update our state such as which queue
// is being shown, the current title and description and the PlaybackState.
private final MediaControllerCompat.Callback mCallback =
new MediaControllerCompat.Callback() {
@Override
public void onPlaybackStateChanged(@NonNull PlaybackStateCompat state) {
LogHelper.d(TAG, "Received playback state change to state ", state.getState());
PlaybackControlsFragment.this.onPlaybackStateChanged(state);
}
@Override
public void onMetadataChanged(MediaMetadataCompat metadata) {
if (metadata == null) {
return;
}
LogHelper.d(
TAG,
"Received metadata state change to mediaId=",
metadata.getDescription().getMediaId(),
" song=",
metadata.getDescription().getTitle());
PlaybackControlsFragment.this.onMetadataChanged(metadata);
}
};
@Override
public View onCreateView(
LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_playback_controls, container, false);
mPlayPause = (ImageButton) rootView.findViewById(R.id.play_pause);
mPlayPause.setEnabled(true);
mPlayPause.setOnClickListener(mButtonListener);
mTitle = (TextView) rootView.findViewById(R.id.title);
mSubtitle = (TextView) rootView.findViewById(R.id.artist);
mExtraInfo = (TextView) rootView.findViewById(R.id.extra_info);
mAlbumArt = (ImageView) rootView.findViewById(R.id.album_art);
rootView.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), FullScreenPlayerActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
MediaControllerCompat controller =
((FragmentActivity) getActivity()).getSupportMediaController();
MediaMetadataCompat metadata = controller.getMetadata();
if (metadata != null) {
intent.putExtra(
MainActivity.EXTRA_CURRENT_MEDIA_DESCRIPTION, metadata.getDescription());
}
startActivity(intent);
}
});
return rootView;
}
@Override
public void onStart() {
super.onStart();
LogHelper.d(TAG, "fragment.onStart");
MediaControllerCompat controller =
((FragmentActivity) getActivity()).getSupportMediaController();
if (controller != null) {
onConnected();
}
}
@Override
public void onStop() {
super.onStop();
LogHelper.d(TAG, "fragment.onStop");
MediaControllerCompat controller =
((FragmentActivity) getActivity()).getSupportMediaController();
if (controller != null) {
controller.unregisterCallback(mCallback);
}
}
public void onConnected() {
MediaControllerCompat controller =
((FragmentActivity) getActivity()).getSupportMediaController();
LogHelper.d(TAG, "onConnected, mediaController==null? ", controller == null);
if (controller != null) {
onMetadataChanged(controller.getMetadata());
onPlaybackStateChanged(controller.getPlaybackState());
controller.registerCallback(mCallback);
}
}
private void onMetadataChanged(MediaMetadataCompat metadata) {
LogHelper.d(TAG, "onMetadataChanged ", metadata);
if (getActivity() == null) {
LogHelper.w(
TAG,
"onMetadataChanged called when getActivity null,"
+ "this should not happen if the callback was properly unregistered. Ignoring.");
return;
}
if (metadata == null) {
return;
}
mTitle.setText(metadata.getDescription().getTitle());
mSubtitle.setText(metadata.getDescription().getSubtitle());
String artUrl = null;
if (metadata.getDescription().getIconUri() != null) {
artUrl = metadata.getDescription().getIconUri().toString();
}
if (!TextUtils.equals(artUrl, mArtUrl)) {
mArtUrl = artUrl;
Bitmap art = metadata.getDescription().getIconBitmap();
AlbumArtCache cache = AlbumArtCache.getInstance();
if (art == null) {
art = cache.getIconImage(mArtUrl);
}
if (art != null) {
mAlbumArt.setImageBitmap(art);
} else {
cache.fetch(
artUrl,
new AlbumArtCache.FetchListener() {
@Override
public void onFetched(String artUrl, Bitmap bitmap, Bitmap icon) {
if (icon != null) {
LogHelper.d(
TAG, "album art icon of w=", icon.getWidth(), " h=", icon.getHeight());
if (isAdded()) {
mAlbumArt.setImageBitmap(icon);
}
}
}
});
}
}
}
public void setExtraInfo(String extraInfo) {
if (extraInfo == null) {
mExtraInfo.setVisibility(View.GONE);
} else {
mExtraInfo.setText(extraInfo);
mExtraInfo.setVisibility(View.VISIBLE);
}
}
private void onPlaybackStateChanged(PlaybackStateCompat state) {
LogHelper.d(TAG, "onPlaybackStateChanged ", state);
if (getActivity() == null) {
LogHelper.w(
TAG,
"onPlaybackStateChanged called when getActivity null,"
+ "this should not happen if the callback was properly unregistered. Ignoring.");
return;
}
if (state == null) {
return;
}
boolean enablePlay = false;
switch (state.getState()) {
case PlaybackStateCompat.STATE_PAUSED:
case PlaybackStateCompat.STATE_STOPPED:
enablePlay = true;
break;
case PlaybackStateCompat.STATE_ERROR:
LogHelper.e(TAG, "error playbackstate: ", state.getErrorMessage());
Toast.makeText(getActivity(), state.getErrorMessage(), Toast.LENGTH_LONG).show();
break;
}
if (enablePlay) {
mPlayPause.setImageDrawable(
ContextCompat.getDrawable(getActivity(), R.drawable.ic_play_arrow_black_36dp));
} else {
mPlayPause.setImageDrawable(
ContextCompat.getDrawable(getActivity(), R.drawable.ic_pause_black_36dp));
}
MediaControllerCompat controller =
((FragmentActivity) getActivity()).getSupportMediaController();
String extraInfo = null;
if (controller != null && controller.getExtras() != null) {
String castName = controller.getExtras().getString(MusicService.EXTRA_CONNECTED_CAST);
if (castName != null) {
extraInfo = getResources().getString(R.string.casting_to_device, castName);
}
}
setExtraInfo(extraInfo);
}
private final View.OnClickListener mButtonListener =
new View.OnClickListener() {
@Override
public void onClick(View v) {
MediaControllerCompat controller =
((FragmentActivity) getActivity()).getSupportMediaController();
PlaybackStateCompat stateObj = controller.getPlaybackState();
final int state = stateObj == null ? PlaybackStateCompat.STATE_NONE : stateObj.getState();
LogHelper.d(TAG, "Button pressed, in state " + state);
switch (v.getId()) {
case R.id.play_pause:
LogHelper.d(TAG, "Play button pressed, in state " + state);
if (state == PlaybackStateCompat.STATE_PAUSED
|| state == PlaybackStateCompat.STATE_STOPPED
|| state == PlaybackStateCompat.STATE_NONE) {
playMedia();
} else if (state == PlaybackStateCompat.STATE_PLAYING
|| state == PlaybackStateCompat.STATE_BUFFERING
|| state == PlaybackStateCompat.STATE_CONNECTING) {
pauseMedia();
}
break;
}
}
};
private void playMedia() {
MediaControllerCompat controller =
((FragmentActivity) getActivity()).getSupportMediaController();
if (controller != null) {
controller.getTransportControls().play();
}
}
private void pauseMedia() {
MediaControllerCompat controller =
((FragmentActivity) getActivity()).getSupportMediaController();
if (controller != null) {
controller.getTransportControls().pause();
}
}
}