تتيح لك استدعاءات جلسات تشغيل الوسائط المتعددة في واجهات برمجة تطبيقات متعددة التحكّم في المشغّل وإدارة ميزة التركيز على الصوت والتواصل مع جلسة تشغيل الوسائط وخدمة متصفّح الوسائط. يُرجى العِلم أنّ منطق
MediaSession
الذي يستجيب لمعاودة الاتصال يجب أن يكون متسقًا. يجب ألا يعتمد سلوك معاودة الاتصال على هوية المتصل، حيث قد يكون ذلك نشاطًا في التطبيق نفسه الذي يشغّل MediaSession
أو أي تطبيق آخر مرتبط MediaController
بـ MediaSession
.
يلخص الجدول التالي كيفية توزيع هذه المهام عبر عمليات الاستدعاء.
onPlay() | onPause() | onStop() | |
التركيز على الصوت | تم تمرير requestFocus() للحصول على OnAudioFocusChangeListener .يُرجى الاتصال دائمًا بالرقم requestFocus() أولاً، والمتابعة فقط في حال تم التركيز على ذلك.
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abandonAudioFocus()
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الخدمة | startService()
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stopSelf()
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جلسة وسائط | setActive(true)
- تعديل البيانات الوصفية والحالة |
- تحديث بيانات التعريف والحالة | setActive(false)
- تعديل البيانات الوصفية والحالة |
تنفيذ المشغّل | تشغيل المشغّل | إيقاف المشغّل مؤقتًا | إيقاف المشغّل |
المحتوى الصاخب | تسجيل BroadcastReceiver
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إلغاء تسجيل BroadcastReceiver
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الإشعارات | startForeground(notification)
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stopForeground(false)
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stopForeground(false)
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إليك نموذج إطار عمل لمعاودة الاتصال:
Kotlin
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) } }
Java
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); } };