Android Question AudioFocusRequest

[Philip Prins]

Hello ,

My application receives audio from a server .
After a while when the screen is off the audio is not played no more.

Only when i turn on the screen the audio is played again.

I need to request the audio focus from my service , not my main application.
How to do this ?

I found the following information:
https://developer.android.com/reference/android/media/AudioFocusRequest.html

// initialization of the audio attributes and focus request
 mAudioManager = (AudioManager) Context.getSystemService(Context.AUDIO_SERVICE);
 mPlaybackAttributes = new AudioAttributes.Builder()
         .setUsage(AudioAttributes.USAGE_MEDIA)
         .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
         .build();
 mFocusRequest = new AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
         .setAudioAttributes(mPlaybackAttributes)
         .setAcceptsDelayedFocusGain(true)
         .setWillPauseWhenDucked(true)
         .setOnAudioFocusChangeListener(this, mMyHandler)
         .build();
 mMediaPlayer = new MediaPlayer();
 mMediaPlayer.setAudioAttributes(mPlaybackAttributes);
 final Object mFocusLock = new Object();

 boolean mPlaybackDelayed = false;

 // requesting audio focus
 int res = mAudioManager.requestAudioFocus(mFocusRequest);
 synchronized (mFocusLock) {
     if (res == AudioManager.AUDIOFOCUS_REQUEST_FAILED) {
         mPlaybackDelayed = false;
     } else if (res == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
         mPlaybackDelayed = false;
         playbackNow();
     } else if (res == AudioManager.AUDIOFOCUS_REQUEST_DELAYED) {
        mPlaybackDelayed = true;
     }
 }

 // implementation of the OnAudioFocusChangeListener
 [USER=69643]@override[/USER]
 public void onAudioFocusChange(int focusChange) {
     switch (focusChange) {
         case AudioManager.AUDIOFOCUS_GAIN:
             if (mPlaybackDelayed || mResumeOnFocusGain) {
                 synchronized (mFocusLock) {
                     mPlaybackDelayed = false;
                     mResumeOnFocusGain = false;
                 }
                 playbackNow();
             }
             break;
         case AudioManager.AUDIOFOCUS_LOSS:
             synchronized (mFocusLock) {
                 // this is not a transient loss, we shouldn't automatically resume for now
                 mResumeOnFocusGain = false;
                 mPlaybackDelayed = false;
             }
             pausePlayback();
             break;
         case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
         case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
             // we handle all transient losses the same way because we never duck audio books
             synchronized (mFocusLock) {
                 // we should only resume if playback was interrupted
                 mResumeOnFocusGain = mMediaPlayer.isPlaying();
                 mPlaybackDelayed = false;
             }
             pausePlayback();
             break;
     }
 }

 // Important:
 // Also set "mResumeOnFocusGain" to false when the user pauses or stops playback: this way your
 // application doesn't automatically restart when it gains focus, even though the user had
 // stopped it.

How can i do this from a B4A service?

 

[Erel]

Have you tried to implement this code in your service: https://www.b4x.com/android/forum/threads/audiofocus.53295/#post-334224 (not starter service)?

Pass 1 instead of 2 to request https://developer.android.com/reference/android/media/AudioManager.html#AUDIOFOCUS_GAIN