使用seekbar設置媒體播放器對象的音量

Question

我想在seekbar的幫助下設置我的mediaplayer對象的音量。我在我的應用中使用了它的setVolume（）方法，但它沒有用，因爲音量沒有變化。 這裏是我的代碼：

setVolumeControlStream(AudioManager.STREAM_MUSIC); 
     volumeSeekbar=(SeekBar)findViewById(R.id.seekBar1); 
     audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 
     volumeSeekbar.setMax(audioManager 
      .getStreamMaxVolume(AudioManager.STREAM_MUSIC)); 
     volumeSeekbar.setProgress(audioManager 
       .getStreamVolume(AudioManager.STREAM_MUSIC)); 

    volumeSeekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { 

      @Override 
      public void onStopTrackingTouch(SeekBar arg0) { 
       // TODO Auto-generated method stub 
       Log.i(tag,"touch stopped"); 

      } 

      @Override 
      public void onStartTrackingTouch(SeekBar arg0) { 
       // TODO Auto-generated method stub 
       Log.i(tag,"touch started"); 

      } 
      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, 
        boolean fromUser) { 
       //mp is the mediaplayer object.. 
       mp.setVolume(progress, progress); 
       Log.i(tag,"working with seekbar"); 
          } 

     }); 
    } 

audioManager和volumeseekbar被初始化。

Answer 1

使用下面的代碼它的工作對MEE ..

private SeekBar mSeekBarVolume; 
    private AudioManager audioManager; 
    private int maxVolume; 
    private int curVolume; 
/** 
    * To initialize the seek bar 
    */ 
    private void initialiseSeekBar() { 

     maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC); 
     curVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC); 
     mSeekBarVolume.setMax(maxVolume); 
     mSeekBarVolume.setProgress(curVolume); 
     mSeekBarVolume 
       .setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { 
        @Override 
        public void onStopTrackingTouch(SeekBar arg0) { 
        } 

        @Override 
        public void onStartTrackingTouch(SeekBar arg0) { 

        } 

        @Override 
        public void onProgressChanged(SeekBar arg0, int arg1, 
          boolean arg2) { 
         audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 
           arg1, 0); 
        } 
       }); 
    }