如何像WhatsApp那样在后台运行服务,以便在没有唤醒设备的情况下备份聊天记录?

service 用过了。

extend Service

public class service extends Service {

// declaring object of MediaPlayer
private MediaPlayer player;

public service() {
}
@Override
public int onStartCommand(Intent intent, int flags, int startId){
    onTaskRemoved(intent);
    Toast.makeText(getApplicationContext(),"This is a Service running in Background",
            Toast.LENGTH_SHORT).show();
    player = MediaPlayer.create(getApplicationContext(),R.raw.ringtone);
    player.start();
    startForegroundService(intent);
    return START_STICKY;
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onTaskRemoved(Intent rootIntent) {
    Intent restartServiceIntent = new Intent(getApplicationContext(),this.getClass());
    restartServiceIntent.setPackage(getPackageName());
    startService(restartServiceIntent);
    super.onTaskRemoved(rootIntent);
}
@Override
public ComponentName startForegroundService(final Intent service) {
    return startForegroundService(service);
}
}

运行您编写的源代码

Intent intent = new Intent(this, service.class);
ContextCompat.startForegroundService(this,intent);

或者,您可以使用

startService(new Intent(getApplicationContext(),service.class));

这是你的答案 git repo

你可以用WorkManager,这是最好的方法。 我用它做背景处理,效果很不错。 https://developer.android.com/topic/libraries/architecture/workmanager