Mediaplayer 在线播放 MP3 文件

Question

我有一个 Android 应用程序可以流式传输 MP3 文件并在播放器中播放该文件， 但问题是mediaPlayer.prepare(); 需要很长时间缓冲并且应用程序冻结 所以我尝试使用prepareAsync();，但是使用这个功能我无法让播放器播放下一个文件。

它只是在线播放一个文件；如果我需要播放另一个文件，我必须在播放结束时关闭并重新启动活动。这是我的代码：

public void playMp3(String _link)
{
mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
    public void onPrepared(MediaPlayer mp) {
        if(!mediaPlayer.isPlaying()){
        mediaPlayer.start();
        Progressbar.setVisibility(View.INVISIBLE);
        play.setVisibility(View.GONE);
        stop.setVisibility(View.VISIBLE);
        songProgressBar.setProgress(0);
        songProgressBar.setMax(100);
        }
        updateProgressBar();      
    }
});
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

    @Override
    public void onCompletion(MediaPlayer mp) {
        // TODO Auto-generated method stub
        mediaPlayer.reset();
        songProgressBar.setProgress(0);
        songProgressBar.setSecondaryProgress(0);
        play.setVisibility(View.VISIBLE);
        stop.setVisibility(View.GONE);
        link = "http://server11.mp3quran.net/hawashi/002.mp3";
        playMp3(link);

    }
});
mediaPlayer.setOnBufferingUpdateListener(new OnBufferingUpdateListener() {
    @Override
    public void onBufferingUpdate(MediaPlayer mp, int percent) {
       // Toast.makeText(getApplicationContext(), "n" + percent, Toast.LENGTH_LONG).show();
        songProgressBar.setSecondaryProgress(percent);

         if(percent==100)
         {
             Progressbar.setVisibility(View.INVISIBLE);

         }else if(percent > songProgressBar.getProgress())
         {
             Progressbar.setVisibility(View.INVISIBLE);
         }else
         {
             Progressbar.setVisibility(View.VISIBLE);
         }

    }
});

mediaPlayer.reset();
Progressbar.setVisibility(View.VISIBLE);
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

try {
    mediaPlayer.setDataSource(_link);
    //mediaPlayer.prepare(); // might take long! (for buffering, etc)   //@@
    mediaPlayer.prepareAsync();
} catch (IllegalArgumentException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (SecurityException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IllegalStateException e) {
    // TODO Auto-generated catch block///
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}}

Answer 1

实际上我不知道你的代码哪里出错了，但我会解释我是如何在我的应用程序中做到这一点的

public void playMp3(String _link){

                mediaPlayer.reset();
                Progressbar.setVisibility(View.VISIBLE);
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

            try {
                mediaPlayer.setDataSource(_link);
                mediaPlayer.setOnBufferingUpdateListener(this);
                mediaPlayer.setOnPreparedListener(this);
                //mediaPlayer.prepare(); // might take long! (for buffering, etc)   //@@
                mediaPlayer.prepareAsync();
            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block///
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

然后在你的类中实现 OnCompletionListener、OnPreparedListener 和 OnBufferingUpdateListener

public class PlayerActivity extends Activity implements OnCompletionListener, OnPreparedListener, OnBufferingUpdateListener{
.
.
.

并实现所有方法

public void onPrepared(MediaPlayer mediaplayer) {
    if(!mediaPlayer.isPlaying()){
        mediaPlayer.start();
        Progressbar.setVisibility(View.INVISIBLE);
        play.setVisibility(View.GONE);
        stop.setVisibility(View.VISIBLE);
        songProgressBar.setProgress(0);
        songProgressBar.setMax(100);
        }
        updateProgressBar();      
}

@Override
public void onCompletion(MediaPlayer mediaPlayer) {
    //mediaPlayer.reset();
        songProgressBar.setProgress(0);
        songProgressBar.setSecondaryProgress(0);
        play.setVisibility(View.VISIBLE);
        stop.setVisibility(View.GONE);
        link = "http://server11.mp3quran.net/hawashi/002.mp3";
        playMp3(link);
}

@Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
     songProgressBar.setSecondaryProgress(percent);

         if(percent==100)
         {
             Progressbar.setVisibility(View.INVISIBLE);

         }else if(percent > songProgressBar.getProgress())
         {
             Progressbar.setVisibility(View.INVISIBLE);
         }else
         {
             Progressbar.setVisibility(View.VISIBLE);
         }
}

我希望这对你有所帮助。