Muscic 的暫停與繼續..

Music 的 MediaPlaybackService.java :

用 logcat -s MediaPlaybackService 來看..

可以看到，Music 在background 繼續播放，在收到 AudioManger 的通之後，才會停止： case FOCUSCHANGE: // This code is here so we can better synchronize it with the code that // handles fade-in // AudioFocus is a new feature: focus updates are made verbose on purpose switch (msg.arg1) { case AudioManager.AUDIOFOCUS_LOSS: Log.v(LOGTAG, "AudioFocus: received AUDIOFOCUS_LOSS"); if(isPlaying()) { mPausedByTransientLossOfFocus = false; } pause(); break;

但是其他的 event: AUDIOFOCUS_GAIN, AUDIOFOCUSE_LOSS_TRANSIENT 都沒收到。

從 code 來看， 這兩個 message 應該是在有電話進來的時候會有，先收到 LOSS_TRANSIENT。
等電話掛斷後，收到 AUDIOFOCUS_GAIN。

---

另外，BroadcastReceiver( ) 也有針對 play, pause, next, prev 的 cmd 操作，可以把 debugLog 修改一下： Log.v(LOGTAG,"mIntentReceiver.onReceive " + action + " / " + cmd);

這個 command 是給 Music app 自己用的 - 因為宣告成　class private variable.

上面的messasge 出來的是： V/MediaPlaybackService( 2610): mIntentReceiver.onReceive com.android.music.musicservicecommand / pause V/MediaPlaybackService( 2610): pause V/MediaPlaybackService( 2610): mIntentReceiver.onReceive com.android.music.musicservicecommand / pause V/MediaPlaybackService( 2610): pause V/MediaPlaybackService( 2610): onStartCommand

在 framework 裡找到用這個command(Intent) 的 code:

frameworks/base/core/java/android/widget/VideoView.java: private void openVideo() { if (mUri == null || mSurfaceHolder == null) { // not ready for playback just yet, will try again later return; } // Tell the music playback service to pause // TODO: these constants need to be published somewhere in the framework. Intent i = new Intent("com.android.music.musicservicecommand"); i.putExtra("command", "pause"); mContext.sendBroadcast(i);