关于Android的MediaPlayer的初始化问题

[wulinsam]

public class AudioPlayer {
    private MediaPlayer mPlayer;
    private Context context;

    AudioPlayer(Context c){
        context = c;
    }

    public void stop(){
        if(mPlayer != null){
            mPlayer.release();
            mPlayer = null;
        }
    }
    public void play(){
        stop();
    //为什么要在这里初始化mPlayer而不能在构造函数里初始化
        mPlayer = MediaPlayer.create(context,R.raw.one_small_step);

        mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                stop();
            }
        });
        mPlayer.start();
    }
}