Android beacon库如何将前台服务转到后台？

<service
    android:name=".MyBackgroundService"
    android:enabled="true"
    android:exported="false" />

public class MyBackgroundService extends Service {
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // 在此处执行后台任务逻辑
        return START_STICKY;
    }

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

Intent intent = new Intent(this, MyBackgroundService.class);
startService(intent);

@Override
public void onDestroy() {
    super.onDestroy();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        Intent intent = new Intent(this, MyBackgroundService.class);
        startForegroundService(intent);
    } else {
        Intent intent = new Intent(this, MyBackgroundService.class);
        startService(intent);
    }
}