如何在后台播放音频- android

// MyAudioService.java

import android.app.Service;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;

public class MyAudioService extends Service implements MediaPlayer.OnPreparedListener {
    private MediaPlayer mediaPlayer;
    private final IBinder binder = new LocalBinder();

    public class LocalBinder extends Binder {
        MyAudioService getService() {
            return MyAudioService.this;
        }
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnPreparedListener(this);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // 请求音频焦点
        AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
        audioManager.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);

        // 加载并播放音频
        try {
            mediaPlayer.setDataSource("http://example.com/audio.mp3");
            mediaPlayer.prepareAsync();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return START_STICKY;
    }

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

        // 释放音频焦点
        AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
        audioManager.abandonAudioFocus(null);
    }

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

    @Override
    public void onPrepared(MediaPlayer mp) {
        mediaPlayer.start();
    }
}

<service android:name=".MyAudioService" />