Medya oturumu geri çağırmaları

Medya oturumunuz, oynatıcıyı kontrol etmek, ses odağını yönetmek ve çeşitli API'larda bulunan medya oturumu ve medya tarayıcısı hizmetiyle iletişim kurabilirsiniz. Lütfen Geri çağırmalara yanıt veren MediaSession mantığı tutarlı olmalıdır. Davranış arayanın kimliğine bağlı olmamalıdır. MediaSession çalıştıran aynı uygulamadaki bir etkinlik veya MediaController, MediaSession adlı ağa bağlandı.

Aşağıdaki tabloda, bu görevlerin geri çağırmalarda nasıl dağıtıldığı özetlenmiştir.

onPlay() onPause() onStop()
Ses Odağı requestFocus() OnAudioFocusChangeListener adlı kişiyi geçiyor.
Her zaman önce requestFocus() adlı kişiyi çağırın, yalnızca odaklanma izni verilmişse devam edin. 		abandonAudioFocus()
Hizmet startService() stopSelf()
Medya Oturumu setActive(true).
- Meta verileri ve durumu güncelleyin 		- Meta verileri ve durumu güncelleyin setActive(false).
- Meta verileri ve durumu güncelleyin
Oynatıcı Uygulaması Oynatıcıyı başlat Oynatıcıyı duraklat Oynatıcıyı durdur
Gürültülü Olma BroadcastReceiver cihazınızı kaydedin BroadcastReceiver kaydınızı iptal edin
Bildirimler startForeground(notification) stopForeground(false) stopForeground(false)

Aşağıda, geri çağırma için örnek bir çerçeve görebilirsiniz:

KotlinJava
private val intentFilter = IntentFilter(ACTION_AUDIO_BECOMING_NOISY)

// Defined elsewhere...
private lateinit var afChangeListener: AudioManager.OnAudioFocusChangeListener
private val myNoisyAudioStreamReceiver = BecomingNoisyReceiver()
private lateinit var myPlayerNotification: MediaStyleNotification
private lateinit var mediaSession: MediaSessionCompat
private lateinit var service: MediaBrowserService
private lateinit var player: SomeKindOfPlayer

private lateinit var audioFocusRequest: AudioFocusRequest

private val callback = object: MediaSessionCompat.Callback() {
    override fun onPlay() {
        val am = context.getSystemService(Context.AUDIO_SERVICE) as AudioManager
        // Request audio focus for playback, this registers the afChangeListener

        audioFocusRequest = AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN).run {
            setOnAudioFocusChangeListener(afChangeListener)
            setAudioAttributes(AudioAttributes.Builder().run {
                setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                build()
            })
            build()
        }
        val result = am.requestAudioFocus(audioFocusRequest)
        if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
            // Start the service
            startService(Intent(context, MediaBrowserService::class.java))
            // Set the session active  (and update metadata and state)
            mediaSession.isActive = true
            // start the player (custom call)
            player.start()
            // Register BECOME_NOISY BroadcastReceiver
            registerReceiver(myNoisyAudioStreamReceiver, intentFilter)
            // Put the service in the foreground, post notification
            service.startForeground(id, myPlayerNotification)
        }
    }

    public override fun onStop() {
        val am = context.getSystemService(Context.AUDIO_SERVICE) as AudioManager
        // Abandon audio focus
        am.abandonAudioFocusRequest(audioFocusRequest)
        unregisterReceiver(myNoisyAudioStreamReceiver)
        // Stop the service
        service.stopSelf()
        // Set the session inactive  (and update metadata and state)
        mediaSession.isActive = false
        // stop the player (custom call)
        player.stop()
        // Take the service out of the foreground
        service.stopForeground(false)
    }

    public override fun onPause() {
        val am = context.getSystemService(Context.AUDIO_SERVICE) as AudioManager
        // Update metadata and state
        // pause the player (custom call)
        player.pause()
        // unregister BECOME_NOISY BroadcastReceiver
        unregisterReceiver(myNoisyAudioStreamReceiver)
        // Take the service out of the foreground, retain the notification
        service.stopForeground(false)
    }
}
 
private IntentFilter intentFilter = new IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY);

// Defined elsewhere...
private AudioManager.OnAudioFocusChangeListener afChangeListener;
private BecomingNoisyReceiver myNoisyAudioStreamReceiver = new BecomingNoisyReceiver();
private MediaStyleNotification myPlayerNotification;
private MediaSessionCompat mediaSession;
private MediaBrowserService service;
private SomeKindOfPlayer player;

private AudioFocusRequest audioFocusRequest;

MediaSessionCompat.Callback callback = new
    MediaSessionCompat.Callback() {
        @Override
        public void onPlay() {
            AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
            // Request audio focus for playback, this registers the afChangeListener
            AudioAttributes attrs = new AudioAttributes.Builder()
                    .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                    .build();
            audioFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
                    .setOnAudioFocusChangeListener(afChangeListener)
                    .setAudioAttributes(attrs)
                    .build();
            int result = am.requestAudioFocus(audioFocusRequest);

            if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
                // Start the service
                startService(new Intent(context, MediaBrowserService.class));
                // Set the session active  (and update metadata and state)
                mediaSession.setActive(true);
                // start the player (custom call)
                player.start();
                // Register BECOME_NOISY BroadcastReceiver
                registerReceiver(myNoisyAudioStreamReceiver, intentFilter);
                // Put the service in the foreground, post notification
                service.startForeground(id, myPlayerNotification);
            }
        }

        @Override
        public void onStop() {
            AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
            // Abandon audio focus
            am.abandonAudioFocusRequest(audioFocusRequest);
            unregisterReceiver(myNoisyAudioStreamReceiver);
            // Stop the service
            service.stopSelf();
            // Set the session inactive  (and update metadata and state)
            mediaSession.setActive(false);
            // stop the player (custom call)
            player.stop();
            // Take the service out of the foreground
            service.stopForeground(false);
        }

        @Override
        public void onPause() {
            AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
            // Update metadata and state
            // pause the player (custom call)
            player.pause();
            // unregister BECOME_NOISY BroadcastReceiver
            unregisterReceiver(myNoisyAudioStreamReceiver);
            // Take the service out of the foreground, retain the notification
            service.stopForeground(false);
        }
    };