Android:没有调用MediaPlayer onPrepared

Question

正如标题所说,未调用onPrepared()重写方法.

mediaPlayer = new MediaPlayer();
mediaPlayer.setOnPreparedListener(new OnPreparedListener(){
   @Override
   public void onPrepared(MediaPlayer mp){
      if (mp.equals(mediaPlayer)) isReady_mediaPlayer = true;

      Log.e("I", "Media player has been loaded to memory !");
   }
});

mediaPlayer = MediaPlayer.create(this, R.raw.my_sound_mp3);

Answer 1

这是因为你正在创建一个新MediaPlayer对象.这个没有任何onPreparededListener设置.

在这里创建并分配一个MediaPlayer对象:

mediaPlayer = new MediaPlayer();

接下来你设置一个onPreparedListener.

但是你创建并分配一个新的!此作业会覆盖您之前的行.

mediaPlayer = MediaPlayer.create(this, R.raw.my_sound_mp3);

这个没有onPreparedListener设置.

要修复,请不要使用该create方法,请setDataSource改用

AssetFileDescriptor afd = context.getResources().openRawResourceFd(R.raw.my_sound_mp3);
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setOnPreparedListener(new OnPreparedListener(){
    @Override
    public void onPrepared(MediaPlayer mp){
       if (mp.equals(mediaPlayer)) isReady_mediaPlayer = true;
       Log.e("I", "Media player has been loaded to memory !");
    }
});
mediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
afd.close();
mediaPlayer.prepare();