java - 音频文件无法使用 mediaController 播放？

Question

尝试使用媒体 Controller 通过 url 播放音频文件

但是我收到错误:

09-11 10:28:23.970: E/MediaPlayer(912): Attempt to call getDuration without a valid mediaplayer 09-11 10:28:23.970: E/MediaPlayer(912): error (-38, 0) 09-11 10:28:23.990: E/MediaPlayer(912): Attempt to perform seekTo in wrong state: mPlayer=0x5d425340, mCurrentState=0

我在这里查看了各种答案，但没有解决。 我尝试在 onPrepared()

中调用 getDuration()

mMediaPlayer = new MediaPlayer();
mMediaController = new MediaController(this);
mMediaController.setMediaPlayer(TextToSpeechActivity.this);
mMediaController.setAnchorView(findViewById(R.id.audioView));


try {
    mMediaPlayer.setDataSource(getSoundUrl());

    mMediaPlayer.prepare();
} catch (IOException e) {
    Log.e("PlayAudioDemo", "Could not open file  for playback.", e);
}

mMediaPlayer.setOnPreparedListener(new OnPreparedListener() {
    @Override
    public void onPrepared(MediaPlayer mp) {
            mHandler.post(new Runnable() {
                    public void run() {
                                           //did not help
                        int duration = mMediaPlayer.getDuration();
                            mMediaController.show(10000);
                            mMediaPlayer.start();
                    }
            });
    }
});

getSoundUrl() 返回声音文件(wav)的 URL，它可以工作，因为如果我不实现媒体 Controller ，歌曲就会播放。 代码很长，所以让我知道我需要添加哪一部分。

Answer 1

我自己解决了这个问题:

我添加了更多调试:

try {
    mMediaPlayer.setDataSource(getSoundUrl());
    mMediaPlayer.prepare();

} 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，我没有使用 setOnPreparedListener() 设置监听器，而是在 Activity 中实现了 OnPreparedListener，如下所示:

public class TextToSpeechActivity  
extends FragmentActivity implements MediaPlayerControl, OnPreparedListener  {

然后onPrepared():

public void onPrepared(MediaPlayer mediaPlayer) {
    Log.d("mylog", "onPrepared");
    mMediaController.setMediaPlayer(this);
    mMediaController.setAnchorView(findViewById(R.id.audioView));

    mHandler.post(new Runnable() {
      public void run() {

          mMediaController.setEnabled(true);
          mMediaController.show();
      }
    });
  }

瞧!