java - 在我的Androidstudio音乐播放器中暂停按钮问题

Question

当我按下暂停按钮，然后按下播放按钮时，歌曲将从暂停位置播放。但是当歌曲结束然后按下播放按钮时，歌曲会从暂停位置播放，而不是从开头播放。

将我的代码粘贴到此处

 public void play(View view){
    if(mediaPlayer==null) {

        mediaPlayer = MediaPlayer.create(this, R.raw.ennasona);
        mediaPlayer.start();
    }

    else if (!mediaPlayer.isPlaying()){

        int nowMusicPosition = 0;

        if (nowMusicPosition == mediaPlayer.getDuration()){

            mediaPlayer = MediaPlayer.create(this, R.raw.ennasona);
            mediaPlayer.start();
        }
        else {
            mediaPlayer.seekTo(pauseCurrentPosition);
            mediaPlayer.start();
            nowMusicPosition = mediaPlayer.getCurrentPosition();

        }
    }
}
public void pause(View view){

    if(mediaPlayer!=null) {

        mediaPlayer.pause();

        pauseCurrentPosition = mediaPlayer.getCurrentPosition();

    }
}
public   void stop(View view){

    if (mediaPlayer!=null)

    mediaPlayer.stop();

    mediaPlayer = null;
}

Answer 1

看看 API，我会说你做得太复杂了。您不必记住该位置，因为如果您暂停播放，MediaPlayer 应该记住该位置本身。

所以只要使用 play()、pause() 就安全了。不要寻找()。

您的代码存在的问题如下:

else if (!mediaPlayer.isPlaying()){
    // this is called nowMusicPosition, down there you've used pauseCurrentPosition
    // this always gets 0, never changes
    int nowMusicPosition = 0;
    if (nowMusicPosition == mediaPlayer.getCurrentPosition()){
         // now you're recreating the MediaPlayer. why?
        mediaPlayer = MediaPlayer.create(this, R.raw.ennasona);
        mediaPlayer.start();
    } else {
        // if video at its end gets stopped, the
        // getCurrentPosition() delivers the last
        // position in the video and you get down
        // here and you're seeking to the paused
        // position again
        mediaPlayer.seekTo(pauseCurrentPosition);
        mediaPlayer.start();
        // now you're setting nowMusicPosition, but it gets 0 again if pressing play again, see above
        nowMusicPosition = mediaPlayer.getCurrentPosition();
    }
}