طرق استدعاء جلسات الوسائط في العديد من واجهات برمجة التطبيقات للتحكم في المشغّل وإدارة تركيز الصوت
والتواصل مع جلسة الوسائط وخدمة متصفح الوسائط. لاحظ أن
يجب أن يكون منطق MediaSession
الذي يستجيب لطلبات معاودة الاتصال متسقًا. السلوك
في طلب معاودة الاتصال أن تعتمد على هوية المتصل، وقد تكون هذه
نشاط في التطبيق نفسه الذي يشغل MediaSession
أو أي تطبيق آخر
تم ربط "MediaController
" بـ "MediaSession
".
يلخص الجدول التالي كيفية توزيع هذه المهام عبر معاودة الاتصال.
onPlay() | onPause() | onStop() | |
التركيز على الصوت | تم تمرير requestFocus() من خلال OnAudioFocusChangeListener .يُرجى الاتصال دائمًا بـ requestFocus() أولاً، ثم المتابعة فقط في حال منح التركيز.
|
abandonAudioFocus()
|
|
الخدمة | startService()
|
stopSelf()
|
|
جلسة الوسائط | setActive(true)
- تحديث البيانات الوصفية والحالة |
- تحديث البيانات الوصفية والحالة | setActive(false)
- تحديث البيانات الوصفية والحالة |
تنفيذ اللاعبين | بدء المشغّل | إيقاف المشغّل مؤقتًا | إيقاف المشغّل |
المحتوى الصاخب | تسجيل BroadcastReceiver
|
إلغاء تسجيل BroadcastReceiver
|
|
الإشعارات | startForeground(notification)
|
stopForeground(false)
|
stopForeground(false)
|
في ما يلي نموذج إطار عمل لمعاودة الاتصال:
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);
}
};