Create an (repetitive high pitch) Alarm on a remote trigger when App is not running (iphone/android) just like Find My iPhone

Question

I would like to cause an alarm on a remote iphone/android device when the app is running or not running.

How do I achieve it ?

I can only think of Whatsapp/S

Answer 1

Its possible using FireBase Notification Services with JobService & FirebaseMessagingService.

• Download the FireBase samples from here .Run module "messaging".I tested it and I was able to receive the notification , even in the Application killed state.

• To manage events periodically/scheduled you must implement & deploy your Server somewhere.You can also check FireBase Functions (Beta) to easily implement Server.

• To show something (Alaram/UI like calling screen) to user start your custom Activity while receiving FireBase notification.Override handleIntent from FirebaseMessagingService.So that you can receive data from your killed/idle Application.

• FireBase Service is System Service & it will be always running.Please have a read.

  Code snippet

  @Override
  public void handleIntent(Intent intent) {
      super.handleIntent(intent);
      // Get Data here
      Log.d(TAG, "intent.."+intent.getExtras());
      Intent intent1=new Intent(this,MainActivity.class);
      intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      startActivity(intent1);
  }
  

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Note : Some devices (Eg; ASUS's Mobile Manager) may reject to start Application's receiver while , Notification arrives.In that case please provide appropriate permissions.