如何在 android studio 中一次播放一首歌曲 [英] how can i play one song at a time in android studio

问题描述

在我的音乐播放器中，如果一首歌曲已经在播放，并且用户点击另一首歌曲，那首歌曲也会开始播放.换句话说，同时播放多首歌曲，这真的很烦人.我一次想要一首歌.这意味着，如果一首歌曲已经在播放，并且用户点击另一首歌曲，那么上一首歌曲将停止播放，而点击的歌曲将继续播放.

In my music player if one song is already playing and if the user clicks on another song then that song also starts playing. In other words, there are multiple songs are playing at a single time this is really annoying. I want one song at a time. That means if a song is already playing and if the user clicks on another song then the previous song will gonna stop and the clicked song will gonna play.

java代码

  public void onItemClick(final Button b, View view, final SongInfo obj, int position) {


                if(b.getText().equals("Stop")){
                    mediaPlayer.stop();
                    mediaPlayer.reset();
                    mediaPlayer.release();
                    mediaPlayer = null;
                    b.setText("Play");
                }
                else {

                    Runnable runnable = new Runnable() {
                        @Override
                        public void run() {
                            try {
                                mediaPlayer = new MediaPlayer();
                                mediaPlayer.setDataSource(obj.getSongUrl());
                                mediaPlayer.prepareAsync();
                                mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                                    @Override
                                    public void onPrepared(MediaPlayer mp) {
                                        mediaPlayer.start();
                                        seekBar.setProgress(0);
                                        seekBar.setMax(mediaPlayer.getDuration());
                                        Log.d("Prog", "run: " + mediaPlayer.getDuration());
                                    }
                                });
                                b.setText("Stop");
                                }catch (Exception e){}
                        }

                    };
                    myHandler.postDelayed(runnable,100);

                }
            }
        });
        checkUserPermission();
        Thread t = new runThread();
        t.start();
    }




    //Thread method for seek bar
    public class runThread extends Thread {
        @Override
        public void run() {
            while (true) {

                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                Log.d("Runwa", "run: " + 1);
                if (mediaPlayer != null) {
                    seekBar.post(new Runnable() {
                        @Override
                        public void run() {
                            seekBar.setProgress(mediaPlayer.getCurrentPosition());
                        }
                    });

                    Log.d("Runwa", "run: " + mediaPlayer.getCurrentPosition());
                }
            }
        }

    }

推荐答案

if("STOP".equalsIgnoreCase(b.getText()) {
    mediaPlayer.stop()  // stop the media player
    mediaPlayer.reset() // reset media player for re-use
    b.setText("Play");  // to re-play song
} else {
    // use the same instance of media-player if want to play single song at a time
    mediaPlayer.setDataSource(obj.getSongUrl());
    mediaPlayer.prepare(); // can use prepareAsync() also
    mediaPlayer.start();
    b.setText("Stop");
}

要一次只播放一首歌曲，您必须始终使用 mediaPlayer 对象的相同实例.(见内嵌评论)

To play only one song at a time, you have to use same instance of mediaPlayer object throughout. (See comments inline)

参考:媒体播放器状态图

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