android - mediaPlayer 准备播放时如何显示进度条

Question

这是我主要 Activity 中的代码:

private void initControls()
 {
  streamButton = (Button) findViewById(R.id.button_stream);
  streamButton.setOnClickListener(new View.OnClickListener()
  {
   public void onClick(View view)
   {
        loading = (ProgressBar) findViewById(R.id.progressBar1);
    Toast
    .makeText(
      MyActivity.this,
       "The following stream is about to start" + station,   
      Toast.LENGTH_LONG).show();
    player.playAudioFile(urlstring2);
    streamButton.setEnabled(false);
    notificate();
   }
  });
 }

下面是我启动媒体播放器本身的代码:

public class player extends MyMainActivity{

static MediaPlayer player;
private static final String TAG = player.class.getSimpleName();



public static void playAudioFile(String urlstring2) {


    player = new MediaPlayer();
    try {
        player.setDataSource(urlstring2);
        loading.setVisibility(View.VISIBLE);
        player.prepareAsync();
        //player.start();

    } catch (Throwable thr) {
        Log.e(TAG, "could not play audio", thr);
        loading.setVisibility(View.INVISIBLE);
    }
    player.setOnPreparedListener(new OnPreparedListener() {

        @Override
        public void onPrepared(MediaPlayer mp) {
            player.start();
            loading.setVisibility(View.INVISIBLE);
        }
    });

}

public static void releasePlayer() {
    if (player != null) {
        // Player-Ressourcen freigeben
        player.release();
        player = null;
    }
}

我想要做的是在用户按下“播放”按钮时显示进度条(循环条)，并且我需要它在媒体播放器开始播放时消失。atm 我只是让圆圈在玩家开始玩并且永远不会消失后显示......

编辑:我让它工作了。我确实像这样启动了播放器:player.prepare();代替 player.prepareAsync();所以进度条显示了一个 View 毫秒。

Answer 1

试试这个。

在按钮中启动进度条是这样的，

 streamButton.setOnClickListener(new View.OnClickListener()
  {
   public void onClick(View view)
   { 
   ProgressDialog progressDialog=null;   
 progressDialog=ProgressDialog.show(context, "", "Playing..."); 
    Toast
    .makeText(
      MyActivity.this,
       "The following stream is about to start" + station,   
      Toast.LENGTH_LONG).show();
    player.playAudioFile(urlstring2);
    streamButton.setEnabled(false);
    notificate();
   }
  });

而且你必须覆盖媒体播放器的 Prepared 监听器，这样你就可以像这样停止其中的进度条，

Player.setOnPreparedListener(new OnPreparedListener() {

            @Override
            public void onPrepared(MediaPlayer mp) {
                    progressDialog.cancel();

            }
        });

这样您就可以实现在您的 Mediaplayer 开始播放文件之前显示进度。