如何在收到通知时启动后台作业

Question

你好每个人，这是我在这里的第一个问题，所以我希望得到答案。我有一个Android应用程序，在FCM的帮助下，我能够在前台，后台以及应用程序被杀死时接收通知。

public class FirebaseMessagingService extends com.google.firebase.messaging.FirebaseMessagingService {
final String jobTag="copyDb";
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);
    String notification_title = remoteMessage.getNotification().getTitle();
    String notification_message = remoteMessage.getNotification().getBody();
    String click_action = remoteMessage.getNotification().getClickAction();
    String from_user_id = remoteMessage.getData().get("from_user_id");
    NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle(notification_title)
                    .setContentText(notification_message);

    Intent resultIntent = new Intent(click_action);
    resultIntent.putExtra("user_id", from_user_id);

    PendingIntent resultPendingIntent =
            getActivity(
                    this,
                    0,
                    resultIntent,
                    PendingIntent.FLAG_UPDATE_CURRENT
            );
    mBuilder.setContentIntent(resultPendingIntent);


    int mNotificationId = (int) System.currentTimeMillis();
    NotificationManager mNotifyMgr =
            (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    mNotifyMgr.notify(mNotificationId, mBuilder.build());
}

我想在通知到达时启动后台作业，我使用了 firebase 作业调度程序：

        SharedPreferences sharedPref = getApplicationContext().getSharedPreferences("fromUser", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPref.edit();
    editor.putString("fromUser",from_user_id);
    editor.commit();
    FirebaseJobDispatcher dispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(getApplicationContext()));
    Job myJob = dispatcher.newJobBuilder()
            .setService(jobDispatcher.class) // the JobService that will be called
            .setTag(jobTag)
            .build();
    dispatcher.mustSchedule(myJob);

但是当应用程序在后台或被杀死时它不起作用，但我收到通知.

我试图将后台任务移动到 FCM onMessageReceived，也遇到了同样的问题。

收到通知时有没有办法触发后台任务？

对好答案的不寻常赞赏:)(

Answer 1

我不确定这能行得通，但你可以试试。创建一个类并扩展Service并在内部创建创建AsyncTask例如：

public class TestServices extends Service {
@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    MyAsyncTask asyncTask = new MyAsyncTask();
    asyncTask.execute();
    return START_NOT_STICKY;
}
private class MyAsyncTask extends AsyncTask<Void, Void, Void>{
    @Override
    protected Void doInBackground(Void... voids) {
        // preform your task here, downloading saving etc.
        return null;
    }
    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        Intent intent = new Intent(TestServices.this, TestServices.class);
        stopService(intent);
       }
    }
 }

不要忘记在清单中注册您的Service类。

然后在方法内部onMessageReceived进行一些更改。试试这个：

Intent notificationIntent = new Intent(mContext, TestServices.class);
PendingIntent pendingIntent = PendingIntent.getService(mContext, 0,    notificationIntent, 0);

希望对您有所帮助。