媒体播放器声音停止（）不工作

Question

我有一个活动的菜单这两个选项

选择一个启动音乐曲目方案（2）应该停止了，但事实并非如此。

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    MediaPlayer mpSoundTrack = MediaPlayer.create(this, R.raw.app_score); 

    switch (item.getItemId()) { 
     case R.id.icon:  Toast.makeText(this, "Music On!", Toast.LENGTH_LONG).show(); 
     mpSoundTrack.start(); 
          break; 
     case R.id.icontext: Toast.makeText(this, "Music Off!", Toast.LENGTH_LONG).show(); 
     mpSoundTrack.stop(); 
          break; 
    } 
    return true; 
    } 

Answer 1

每次创建新的mediaPlayer时，都会停止一个新的mediaPlayer，而不是旧的。你应该保留一个参考：

private MediaPlayer mpSoundTrack = null; 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
     case R.id.icon:  
      Toast.makeText(this, "Music On!", Toast.LENGTH_LONG).show(); 
      mpSoundTrack = MediaPlayer.create(this, R.raw.app_score); 
      mpSoundTrack.start(); 
      break; 
     case R.id.icontext: 
      Toast.makeText(this, "Music Off!", Toast.LENGTH_LONG).show(); 
      if(mpSoundTrack != null) 
       mpSoundTrack.stop(); 
      break; 
    } 
    return true; 
}