收到通知時如何啟動后台作業

Question

大家好，這是我的第一個問題，希望能得到答復。 我有一個Android應用程序，借助FCM，我能夠在前台，后台以及該應用程序被終止時接收通知。

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());

}

我想在通知到達時開始后台作業，我使用了firebase jobDispatcher：

        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);

但是當應用程序在后台或被殺死時，它不起作用，但我仍收到通知。

我試圖將后台任務移到FCM onMessageReceived，也遇到了同樣的問題。

收到通知時，有什么方法可以觸發后台任務？

不尋常的贊賞，一個好的答案:)）

Answer 1

我不確定這項工作是否可行，但是您可以嘗試。 創建一個類並擴展Service然后在內部創建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);
       }
    }
 }

不要忘記在清單中注冊您的Service類。

然后在方法onMessageReceived內部進行一些更改。 嘗試這個：

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

希望可能對您有所幫助。