Android
MediaSession

Syntaxis

• void mediaSessionCompat.setFlags (int vlaggen)
• void mediaSessionCompat.setMediaButtonReceiver (PendingIntent mbr)
• void mediaSessionCompat.setCallback (MediaSessionCompat.Callback callback)
• void mediaSessionCompat.setActive (boolean actief)
• MediaSessionCompat.Token mediaSessionCompat.getSessionToken ()
• void mediaSessionCompat.release ()
• void mediaSessionCompat.setPlaybackState (PlaybackStateCompat-status)
• void mediaSessionCompat.setMetadata (MediaMetadataCompat metadata)

Opmerkingen

Knopgebeurtenissen ontvangen en verwerken

In dit voorbeeld wordt een MediaSession object gemaakt wanneer een Service wordt gestart. Het MediaSession object wordt vrijgegeven wanneer de Service wordt vernietigd:

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();
    }
}

De volgende methode instantieert en configureert de MediaSession knop callbacks:

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);
}

De volgende methode verzendt metagegevens (opgeslagen in een HashMap ) naar het apparaat met behulp van A2DP:

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);
}

De volgende methode stelt de PlaybackState . Het stelt ook in op welke MediaSession de MediaSession reageert:

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);
}