android中媒体播放器问题的多个实例

Question

我在Android中使用MediaPlayer。我有所有的歌曲名称和歌曲的url列表从服务器。当我点击任何项目从服务器播放的歌曲在MediaPlayer。这是我的代码播放歌曲点击"Listview"项目。

    txtEndTimingForMediaPlayer.setText("");
    txtStarTimingForMediaPlayer.setText("");
    seekBarPlayer.setProgress(0);
 // this code is for stop current playing song and release media player
    if(mediaPlayer!=null && mediaPlayer.isPlaying()){
        mediaPlayer.stop();
        mediaPlayer.reset();
        mediaPlayer.release();
        mediaPlayer=null;
    }
    // start new song for play
    mediaPlayer=new MediaPlayer();
    Uri myUri1 = Uri.parse(url);
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    try {
        mediaPlayer.reset();
        mediaPlayer.setDataSource(getActivity(), myUri1);
        mediaPlayer.prepareAsync();
        mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer player) {
                playPause=true;
                player.start();
                mediaFileLengthInMilliseconds = player.getDuration(); 
            }
        });
        mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                playPause=false;
                btnPlayPause.setBackgroundResource(R.drawable.icon_play);                   
            }
        });
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (SecurityException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }  

现在这个代码的问题是，当我连续点击歌曲，然后同一首歌播放多次。如何避免这种多实例问题

Answer 1

我认为当你点击太快播放同一首歌时，if(mediaPlayer!=null && mediaPlayer.isPlaying())是不正确的，然后mediaPlayer=new MediaPlayer();正在创建新实例并播放歌曲，这将导致多次听到同一首歌。调试并检查代码是否进入if (condition)