我正在尝试通过A2DP/AVRCP发送音轨信息。目前,音乐被完美地传输,但是在“接收器”(例如:汽车音响)上,“音轨信息屏幕”为空白的(而使用流行播放器时不是这种情况)。有什么想法吗?
这段代码对我有效:
private static final String AVRCP_PLAYSTATE_CHANGED = "com.android.music.playstatechanged";
private static final String AVRCP_META_CHANGED = "com.android.music.metachanged";
private void bluetoothNotifyChange(String what) {
Intent i = new Intent(what);
i.putExtra("id", Long.valueOf(getAudioId()));
i.putExtra("artist", getArtistName());
i.putExtra("album",getAlbumName());
i.putExtra("track", getTrackName());
i.putExtra("playing", isPlaying());
i.putExtra("ListSize", getQueue());
i.putExtra("duration", duration());
i.putExtra("position", position());
sendBroadcast(i);
}
根据您的播放状态(暂停/播放/元数据更改),使用适当的意图(在上面定义)调用bluetoothNotifyChange函数。
if (mAudioManager == null) {
mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
if (mRemoteControlClient == null) {
Log.d("init()", "API " + Build.VERSION.SDK_INT + " lower then " + Build.VERSION_CODES.LOLLIPOP);
Log.d("init()", "Using RemoteControlClient API.");
mRemoteControlClient = new RemoteControlClient(PendingIntent.getBroadcast(this, 0, new Intent(Intent.ACTION_MEDIA_BUTTON), 0));
mAudioManager.registerRemoteControlClient(mRemoteControlClient);
}
} else {
if (mMediaSession == null) {
Log.d("init()", "API " + Build.VERSION.SDK_INT + " greater or equals " + Build.VERSION_CODES.LOLLIPOP);
Log.d("init()", "Using MediaSession API.");
mMediaSession = new MediaSession(this, "PlayerServiceMediaSession");
mMediaSession.setFlags(MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS);
mMediaSession.setActive(true);
}
}
private void onTrackChanged(String title, String artist, String album, long duration, long position, long trackNumber) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
RemoteControlClient.MetadataEditor ed = mRemoteControlClient.editMetadata(true);
ed.putString(MediaMetadataRetriever.METADATA_KEY_TITLE, title);
ed.putString(MediaMetadataRetriever.METADATA_KEY_ARTIST, artist);
ed.putString(MediaMetadataRetriever.METADATA_KEY_ALBUM, album);
ed.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION, duration);
ed.putLong(MediaMetadataRetriever.METADATA_KEY_CD_TRACK_NUMBER, trackNumber);
ed.apply();
mRemoteControlClient.setPlaybackState(RemoteControlClient.PLAYSTATE_PLAYING, position, 1.0f);
} else {
MediaMetadata metadata = new MediaMetadata.Builder()
.putString(MediaMetadata.METADATA_KEY_TITLE, title)
.putString(MediaMetadata.METADATA_KEY_ARTIST, artist)
.putString(MediaMetadata.METADATA_KEY_ALBUM, album)
.putLong(MediaMetadata.METADATA_KEY_DURATION, duration)
.putLong(MediaMetadata.METADATA_KEY_TRACK_NUMBER, trackNumber)
.build();
mMediaSession.setMetadata(metadata);
PlaybackState state = new PlaybackState.Builder()
.setActions(PlaybackState.ACTION_PLAY)
.setState(PlaybackState.STATE_PLAYING, position, 1.0f, SystemClock.elapsedRealtime())
.build();
mMediaSession.setPlaybackState(state);
}
}
如果元数据发生变化,请检查我们是否与音频蓝牙设备建立了A2DP连接。如果没有连接,就不需要发送元数据信息:
if (mAudioManager.isBluetoothA2dpOn()) {
Log.d("AudioManager", "isBluetoothA2dpOn() = true");
onTrackChanged(getTitle(), getArtist(), getAlbum(), getDuration(), getCurrentPosition(), getId());
}
@Override
public void onDestroy() {
super.onDestroy();
[..]
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
mAudioManager.unregisterRemoteControlClient(mRemoteControlClient);
} else {
mMediaSession.release();
}
}
这就是它在我的汽车音响上的样子
public void onCreate(){
super.onCreate();
mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
ComponentName rec = new ComponentName(getPackageName(), MyReceiver.class.getName());
mAudioManager.registerMediaButtonEventReceiver(rec);
Intent i = new Intent(Intent.ACTION_MEDIA_BUTTON);
i.setComponent(rec);
PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);
mRemoteControlClient = new RemoteControlClient(pi);
mAudioManager.registerRemoteControlClient(mRemoteControlClient);
int flags = RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS
| RemoteControlClient.FLAG_KEY_MEDIA_NEXT
| RemoteControlClient.FLAG_KEY_MEDIA_PLAY
| RemoteControlClient.FLAG_KEY_MEDIA_PAUSE
| RemoteControlClient.FLAG_KEY_MEDIA_PLAY_PAUSE
| RemoteControlClient.FLAG_KEY_MEDIA_STOP
| RemoteControlClient.FLAG_KEY_MEDIA_FAST_FORWARD
| RemoteControlClient.FLAG_KEY_MEDIA_REWIND;
mRemoteControlClient.setTransportControlFlags(flags);
}
private void onTrackChanged(...) {
String title = ...;
String artist = ...;
String album = ...;
long duration = ...;
Intent i = new Intent("com.android.music.metachanged");
i.putExtra("id", 1);
i.putExtra("track", title);
i.putExtra("artist", artist);
i.putExtra("album", album);
i.putExtra("playing", "true");
sendStickyBroadcast(i);
RemoteControlClient.MetadataEditor ed = mRemoteControlClient.editMetadata(true);
ed.putString(MediaMetadataRetriever.METADATA_KEY_TITLE, title);
ed.putString(MediaMetadataRetriever.METADATA_KEY_ALBUM, album);
ed.putString(MediaMetadataRetriever.METADATA_KEY_ARTIST, artist);
ed.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION, track.getDuration());
ed.apply();
}
public void onDestroy(){
mAudioManager.unregisterRemoteControlClient(mRemoteControlClient);
super.onDestroy();
}
ComponentName rec = new ComponentName(getPackageName(), MyReceiver.class.getName());
- Distwo要将轨道元数据发送到主机单元,您需要发送一个意图。
Intent avrcp = new Intent("com.android.music.metachanged");
avrcp.putExtra("track", "song title");
avrcp.putExtra("artist", "artist name");
avrcp.putExtra("album", "album name");
Context.sendBroadcast(avrcp);
public static void sendTrackInfo() {
if(audioManager == null) {
audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
}
if (mMediaSession == null) {
mMediaSession = new MediaSessionCompat(this, "PlayerServiceMediaSession");
mMediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
mMediaSession.setActive(true);
}
if (audioManager.isBluetoothA2dpOn()) {
try {
String songTitle = getTitle();
String artistTitle = getArtist();
String radioImageUri = getImagesArr().get(0);
String songImageUri = getImagesArr().get(1);
long duration = getDuration();
final MediaMetadataCompat.Builder metadata = new MediaMetadataCompat.Builder();
metadata.putString(MediaMetadataCompat.METADATA_KEY_TITLE, songTitle);
metadata.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_TITLE, songTitle);
metadata.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, artistTitle);
metadata.putString(MediaMetadataCompat.METADATA_KEY_ALBUM_ARTIST, artistTitle);
metadata.putString(MediaMetadataCompat.METADATA_KEY_ART_URI, radioImageUri);
metadata.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON_URI, radioImageUri);
metadata.putString(MediaMetadataCompat.METADATA_KEY_ALBUM_ART_URI, songImageUri);
metadata.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, duration);
imageCounter = 0;
Glide.with(act)
.load(Uri.parse(radioImageUri))
.asBitmap()
.into(new SimpleTarget<Bitmap>(250, 250) {
@Override
public void onResourceReady(Bitmap bitmap, GlideAnimation anim) {
metadata.putBitmap(MediaMetadataCompat.METADATA_KEY_ART, bitmap);
metadata.putBitmap(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON, bitmap);
imageCounter = imageCounter + 1;
if(imageCounter == 2) {
mMediaSession.setMetadata(metadata.build());
}
}
});
Glide.with(act)
.load(Uri.parse(songImageUri))
.asBitmap()
.into(new SimpleTarget<Bitmap>(250, 250) {
@Override
public void onResourceReady(Bitmap bitmap, GlideAnimation anim) {
metadata.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, bitmap);
imageCounter = imageCounter + 1;
if(imageCounter == 2) {
mMediaSession.setMetadata(metadata.build());
}
}
});
}
catch (JSONException e) {
e.printStackTrace();
}
}
}