java - 声音不在 android > Ice Cream Sandwich 中播放

Question

我正在使用以下代码来播放声音。在 ICS 之前一切正常。但在 ICS 和更高版本上听不到声音。没有错误，但是听不到声音。

编辑:请注意，以下代码由广播接收器触发。 BroadCast 接收器调用异步任务。在异步任务的后处理方法中，调用了以下方法。

可能是什么错误？

public static void playSound(final Context context, final int volume,
            Uri uri, final int stream, int maxTime, int tickTime) {
        //stopPlaying();
        /*
        if (stream < 0 || stream > 100) {
            throw new IllegalArgumentException(
                    "volume must be between 0 and 100 .Current volume "
                            + volume);
        }*/

        final AudioManager mAudioManager = (AudioManager) context
                .getSystemService(Context.AUDIO_SERVICE);

        int deviceLocalVolume = getDeviceVolume(volume,
                mAudioManager.getStreamMaxVolume(stream));

        Log.d(TAG,
                "device max volume = "
                        + mAudioManager.getStreamMaxVolume(stream)
                        + " for streamType " + stream);
        Log.d(TAG, "playing sound " + uri.toString()
                + " with device local volume " + deviceLocalVolume);

        final int oldVolume = mAudioManager.getStreamVolume(stream);

        // set the volume to what we want it to be. In this case it's max volume
        // for the alarm stream.
        Log.d(Constants.APP_TAG, "setting device local volume to " + deviceLocalVolume);
        mAudioManager.setStreamVolume(stream, deviceLocalVolume,
                AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);

         final MediaPlayer mediaPlayer = new MediaPlayer();
         golbalMMediaPlayer = mediaPlayer;

        try {
             final OnPreparedListener OnPreparedListener = new OnPreparedListener() {

                @Override
                public void onPrepared(final MediaPlayer mp) {
                    Log.d(TAG, "onMediaPlayercompletion listener");
                    mp.start();
                    countDownTimer.start();
                }
            };

            mediaPlayer.setDataSource(context.getApplicationContext(), uri);
            mediaPlayer.setAudioStreamType(stream);
            mediaPlayer.setLooping(false);
            mediaPlayer.setOnPreparedListener(OnPreparedListener);
            mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

                @Override
                public void onCompletion(MediaPlayer mp) {
                    Log.d(Constants.APP_TAG, "Entered onCompletion listener of mediaplayer");
                    mAudioManager.setStreamVolume(stream, oldVolume,
                            AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);
                    try{
                    if(mediaPlayer != null && mediaPlayer.isPlaying()){
                        mediaPlayer.release();
                    }
                    }catch(Exception ex){
                        Log.e(Constants.APP_TAG, "error on oncompletion listener" ,ex);
                    }
                }

            });

             CountDownTimer timer = new CountDownTimer(maxTime*1000, tickTime*1000) {

                @Override
                public void onTick(long millisUntilFinished) {
                    Log.d(TAG, "tick while playing sound ");
                }

                @Override
                public void onFinish() {
                    Log.d(TAG, "timer finished");
                    stopPlaying();
                }
            };

            countDownTimer = timer;

            mediaPlayer.prepareAsync();

        } catch (Exception e) {
            Log.e(TAG, "problem while playing sound", e);
        } finally {

        }
    }

日志:

:07-01 00:00:00.030: D/beephourly(9500): device max volume = 7 for streamType 5
07-01 00:00:00.030: D/beephourly(9500): playing sound content://media/internal/audio/media/166 with device local volume 7
07-01 00:00:00.030: D/beephourly(9500): setting device local volume to 7
07-01 00:00:00.080: D/beephourly(9500): vibrating with pattern = [J@428bae20
07-01 00:00:00.090: D/beephourly(9500): will show normal notification
07-01 00:00:00.100: D/beephourly(9500): notification is enabled
07-01 00:00:00.100: D/usersettings(9500): hr = 0
07-01 00:00:00.110: D/beephourly(9500): onMediaPlayercompletion listener
07-01 00:00:00.451: D/beephourly(9500): tick while playing sound 
07-01 00:00:20.460: D/beephourly(9500): timer finished
07-01 00:00:20.460: D/beephourly(9500): got request to stop playing
07-01 00:00:20.460: D/beephourly(9500): cancelling countdowntimer
07-01 00:00:20.460: D/beephourly(9500): releasing mediaplayer now

Answer 1

试试这个:

播放声音

public class PlaySound extends Activity implements OnTouchListener {
  private SoundPool soundPool;
  private int soundID;
  boolean loaded = false;


/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  View view = findViewById(R.id.textView1);
  view.setOnTouchListener(this);
  // Set the hardware buttons to control the music
  this.setVolumeControlStream(AudioManager.STREAM_MUSIC);
  // Load the sound
  soundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
  soundPool.setOnLoadCompleteListener(new OnLoadCompleteListener() {

  @Override
  public void onLoadComplete(SoundPool soundPool, int sampleId,
      int status) {
     loaded = true;
  }
  });
  soundID = soundPool.load(this, R.raw.sound1, 1);

  }

 @Override
 public boolean onTouch(View v, MotionEvent event) {
  if (event.getAction() == MotionEvent.ACTION_DOWN) {
  // Getting the user sound settings
  AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
  float actualVolume = (float) audioManager
      .getStreamVolume(AudioManager.STREAM_MUSIC);
  float maxVolume = (float) audioManager
      .getStreamMaxVolume(AudioManager.STREAM_MUSIC);
  float volume = actualVolume / maxVolume;
  // Is the sound loaded already?
  if (loaded) {
    soundPool.play(soundID, volume, volume, 1, 0, 1f);
    Log.e("Test", "Played sound");
  }
}
 return false;
}
} 

布局文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="Click on the screen to start playing" >
</TextView>

</LinearLayout> 

来源链接:http://www.vogella.com/tutorials/AndroidMedia/article.html#sound