该问题的解决方法是在后台服务中播放音频。以下是实现此方法的示例代码：

首先，创建一个Service类：

public class AudioService extends Service implements MediaPlayer.OnPreparedListener {

private static final String TAG = "AudioService";
private MediaPlayer mediaPlayer;
private String audioUrl;
private boolean isPlaying;

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    if (intent != null) {
        audioUrl = intent.getStringExtra("url");
        if (audioUrl != null && !audioUrl.isEmpty()) {
            if (mediaPlayer == null) {
                mediaPlayer = new MediaPlayer();
                mediaPlayer.setOnPreparedListener(this);
            }
            try {
                mediaPlayer.setDataSource(audioUrl);
                mediaPlayer.prepareAsync();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return START_STICKY;
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onDestroy() {
    mediaPlayer.release();
    mediaPlayer = null;
    super.onDestroy();
}

@Override
public void onPrepared(MediaPlayer mediaPlayer) {
    mediaPlayer.start();
    isPlaying = true;
}

public boolean isPlaying() {
    return isPlaying;
}

}

然后在Activity中启动后台Service：

private AudioService audioService; private ServiceConnection serviceConnection;

private void startAudioService(String url) { Intent intent = new Intent(this, AudioService.class); intent.putExtra("url", url); startService(intent);

serviceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        AudioService.LocalBinder binder = (AudioService.LocalBinder) iBinder;
        audioService = binder.getService();
        Log.d(TAG, "onServiceConnected: ");
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        audioService = null;
        Log.d(TAG, "onServiceDisconnected: ");
    }
};
bindService(intent, serviceConnection, BIND_AUTO_CREATE);

}

最后，当应用关闭时，调用以下