安卓开发后台永久运行之后台播放无声音乐

import android.media.MediaPlayer;
import java.io.File;
import java.io.IOException;
import java.io.FileOutputStream;
import android.util.Base64;
import java.io.FileInputStream;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MySer extends Service {
    MediaPlayer mediaplayer=null;
    //转base64的音频文件
    String base64 = "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";
    
    @Override
    public void onCreate() {
        super.onCreate();
        
        if(mediaplayer==null){
            new Thread(new Runnable(){

                    @Override
                    public void run() {
                        mediaplayer=new MediaPlayer();
                        try {
                            byte[] mp3SoundByteArray = Base64.decode(base64, Base64.DEFAULT);// 将字符串转换为byte数组
                            File tempMp3 = File.createTempFile("s", ".mp3");
                            tempMp3.deleteOnExit();
                            FileOutputStream fos = new FileOutputStream(tempMp3);
                            fos.write(mp3SoundByteArray);
                            fos.close();
                            FileInputStream fis = new FileInputStream(tempMp3);
                            mediaplayer.setDataSource(fis.getFD());
                            mediaplayer.setLooping(true);
                            mediaplayer.prepareAsync ();//异步准备播放 这部必须设置不然无法播放
                            mediaplayer.start();//开始播放
                        } catch (IllegalStateException e) {
                            System.out.print("出错了="+e);
                        } catch (SecurityException e) {} catch (IOException e) {
                            System.out.print("出错了="+e);
                        } catch (IllegalArgumentException e) {}
                    }
                }).start();

        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        //停止
        mediaplayer.stop();
        mediaplayer=null;
    }
    @Override
    public IBinder onBind(Intent intent) {

        return null;
    }
}