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PORouting audio to Bluetooth Headset (non-A2DP) on Android
 

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  1. PORouting audio to Bluetooth Headset (non-A2DP) on Android
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    <p>I have a non-A2DP single ear BT headset (Plantronics 510) and would like to use it with my Android HTC Magic to listen to low quality audio like podcasts/audio books.</p> <p>After much googling I found that only phone call audio can be routed to the non-A2DP BT headsets. (I would like to know if you have found a ready solution to route all kinds of audio to non-A2DP BT headsets)</p> <p>So I figured, somehow programmatically I can channel the audio to the stream that carries phone call audio. This way I will fool the phone to carry my mp3 audio to my BT headset. I wrote following simple code.</p> <pre><code>import android.content.*; import android.app.Activity; import android.os.Bundle; import android.media.*; import java.io.*; import android.util.Log; public class BTAudioActivity extends Activity { private static final String TAG = "BTAudioActivity"; private MediaPlayer mPlayer = null; private AudioManager amanager = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); amanager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); amanager.setBluetoothScoOn(true); amanager.setMode(AudioManager.MODE_IN_CALL); mPlayer = new MediaPlayer(); try { mPlayer.setDataSource(new FileInputStream( "/sdcard/sample.mp3").getFD()); mPlayer.setAudioStreamType(AudioManager.STREAM_VOICE_CALL); mPlayer.prepare(); mPlayer.start(); } catch(Exception e) { Log.e(TAG, e.toString()); } } @Override public void onDestroy() { mPlayer.stop(); amanager.setMode(AudioManager.MODE_NORMAL); amanager.setBluetoothScoOn(false); super.onDestroy(); } } </code></pre> <p>As you can see I tried combinations of various methods that I thought will fool the phone to believe my audio is a phone call:</p> <ul> <li>Using MediaPlayer's setAudioStreamType(STREAM_VOICE_CALL)</li> <li>using AudioManager's setBluetoothScoOn(true)</li> <li>using AudioManager's setMode(MODE_IN_CALL)</li> </ul> <p>But none of the above worked. If I remove the AudioManager calls in the above code, the audio plays from speaker and if I replace them as shown above then the audio stops coming from speakers, but it doesn't come through the BT headset. So this might be a partial success.</p> <p>I have checked that the BT headset works alright with phone calls.</p> <p>There must be a reason for Android not supporting this. But I can't let go of the feeling that it is not possible to programmatically reroute the audio. Any ideas?</p> <p>P.S. above code needs following permission </p> <p><code>&lt;uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/&gt;</code></p>
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