Android
MediaSession
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Syntax
- void mediaSessionCompat.setFlags (Int Flags)
- void mediaSessionCompat.setMediaButtonReceiver (PendingIntent mbr)
- void mediaSessionCompat.setCallback (Rückruf von MediaSessionCompat.Callback)
- void mediaSessionCompat.setActive (boolean aktiv)
- MediaSessionCompat.Token mediaSessionCompat.getSessionToken ()
- void mediaSessionCompat.release ()
- void mediaSessionCompat.setPlaybackState (PlaybackStateCompat-Status)
- void mediaSessionCompat.setMetadata (Metadaten von MediaMetadataCompat)
Bemerkungen
Verwenden Sie für die beste Praxis die medienkompatible Bibliothek. Die Bibliothek sorgt für Abwärtskompatibilität, indem sie Mediensitzungsmethoden in die entsprechenden Methoden auf älteren Plattformversionen konvertiert, sofern verfügbar.
Schaltflächenereignisse empfangen und bearbeiten
In diesem Beispiel wird ein MediaSession
Objekt erstellt, wenn ein Service
gestartet wird. Das MediaSession
Objekt wird freigegeben, wenn der Service
zerstört wird:
public final class MyService extends Service {
private static MediaSession s_mediaSession;
@Override
public void onCreate() {
// Instantiate new MediaSession object.
configureMediaSession();
}
@Override
public void onDestroy() {
if (s_mediaSession != null)
s_mediaSession.release();
}
}
Die folgende Methode instanziiert und konfiguriert die MediaSession
der MediaSession
Schaltfläche:
private void configureMediaSession {
s_mediaSession = new MediaSession(this, "MyMediaSession");
// Overridden methods in the MediaSession.Callback class.
s_mediaSession.setCallback(new MediaSession.Callback() {
@Override
public boolean onMediaButtonEvent(Intent mediaButtonIntent) {
Log.d(TAG, "onMediaButtonEvent called: " + mediaButtonIntent);
KeyEvent ke = mediaButtonIntent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
if (ke != null && ke.getAction() == KeyEvent.ACTION_DOWN) {
int keyCode = ke.getKeyCode();
Log.d(TAG, "onMediaButtonEvent Received command: " + ke);
}
return super.onMediaButtonEvent(mediaButtonIntent);
}
@Override
public void onSkipToNext() {
Log.d(TAG, "onSkipToNext called (media button pressed)");
Toast.makeText(getApplicationContext(), "onSkipToNext called", Toast.LENGTH_SHORT).show();
skipToNextPlaylistItem(); // Handle this button press.
super.onSkipToNext();
}
@Override
public void onSkipToPrevious() {
Log.d(TAG, "onSkipToPrevious called (media button pressed)");
Toast.makeText(getApplicationContext(), "onSkipToPrevious called", Toast.LENGTH_SHORT).show();
skipToPreviousPlaylistItem(); // Handle this button press.
super.onSkipToPrevious();
}
@Override
public void onPause() {
Log.d(TAG, "onPause called (media button pressed)");
Toast.makeText(getApplicationContext(), "onPause called", Toast.LENGTH_SHORT).show();
mpPause(); // Pause the player.
super.onPause();
}
@Override
public void onPlay() {
Log.d(TAG, "onPlay called (media button pressed)");
mpStart(); // Start player/playback.
super.onPlay();
}
@Override
public void onStop() {
Log.d(TAG, "onStop called (media button pressed)");
mpReset(); // Stop and/or reset the player.
super.onStop();
}
});
s_mediaSession.setFlags(MediaSession.FLAG_HANDLES_MEDIA_BUTTONS | MediaSession.FLAG_HANDLES_TRANSPORT_CONTROLS);
s_mediaSession.setActive(true);
}
Die folgende Methode sendet Metadaten (in einer HashMap
gespeichert) über A2DP an das Gerät:
void sendMetaData(@NonNull final HashMap<String, String> hm) {
// Return if Bluetooth A2DP is not in use.
if (!((AudioManager) getSystemService(Context.AUDIO_SERVICE)).isBluetoothA2dpOn()) return;
MediaMetadata metadata = new MediaMetadata.Builder()
.putString(MediaMetadata.METADATA_KEY_TITLE, hm.get("Title"))
.putString(MediaMetadata.METADATA_KEY_ALBUM, hm.get("Album"))
.putString(MediaMetadata.METADATA_KEY_ARTIST, hm.get("Artist"))
.putString(MediaMetadata.METADATA_KEY_AUTHOR, hm.get("Author"))
.putString(MediaMetadata.METADATA_KEY_COMPOSER, hm.get("Composer"))
.putString(MediaMetadata.METADATA_KEY_WRITER, hm.get("Writer"))
.putString(MediaMetadata.METADATA_KEY_DATE, hm.get("Date"))
.putString(MediaMetadata.METADATA_KEY_GENRE, hm.get("Genre"))
.putLong(MediaMetadata.METADATA_KEY_YEAR, tryParse(hm.get("Year")))
.putLong(MediaMetadata.METADATA_KEY_DURATION, tryParse(hm.get("Raw Duration")))
.putLong(MediaMetadata.METADATA_KEY_TRACK_NUMBER, tryParse(hm.get("Track Number")))
.build();
s_mediaSession.setMetadata(metadata);
}
Die folgende Methode legt den PlaybackState
. Außerdem wird festgelegt, auf welche MediaSession
die MediaSession
reagiert:
private void setPlaybackState(@NonNull final int stateValue) {
PlaybackState state = new PlaybackState.Builder()
.setActions(PlaybackState.ACTION_PLAY | PlaybackState.ACTION_SKIP_TO_NEXT
| PlaybackState.ACTION_PAUSE | PlaybackState.ACTION_SKIP_TO_PREVIOUS
| PlaybackState.ACTION_STOP | PlaybackState.ACTION_PLAY_PAUSE)
.setState(stateValue, PlaybackState.PLAYBACK_POSITION_UNKNOWN, 0)
.build();
s_mediaSession.setPlaybackState(state);
}
Modified text is an extract of the original Stack Overflow Documentation
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