How to determine if Android App open from Notification message?

Question

In general, when i have notification message on the notification bar and click on it. It open the registered App for that message.

On Startup's Activity, How to determine if App is open from it?

and more better is How to retrieve the notification's id on the OnCreate() method?

Update: from @Ovidiu - here is my code to putExtra to push

       Notification notification = new Notification(icon, tickerText, System.currentTimeMillis());        notification.contentView = contentView;         Intent notificationIntent = new Intent(this, Startup.class);        notificationIntent.putExtra("JOBID", jobId);         PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT);         notification.flags = Notification.FLAG_AUTO_CANCEL;        notification.contentIntent = contentIntent;          mNotificationManager.notify(jobId, notification); 

and on Main Activity "Startup.java" code is

    Intent intent = this.getIntent();     if (intent != null && intent.getExtras() != null && intent.getExtras().containsKey("JOBID")) {         int jobID = this.getIntent().getExtras().getInt("JOBID");          if (jobID > 0) {          }     } 

intent.getExtras() always return null. Turn out, I need to pass PendingIntent.FLAG_ONE_SHOT . It is now passed along!!

Answer 1

You need to use putExtra(ID_KEY,id) when you create your Intent for starting your application, and in your onCreate() method you can use getIntent().getExtras().getInt(ID_KEY); to retrieve your passed id integer.

Answer 2

The Start Activity code would be like this, otherwise after once it comes from GCM notification, from then every time the Activity comes from the Recent list, it will say it comes from GCM notification, which is wrong.

Intent intent = this.getIntent(); if (intent != null && intent.getExtras() != null && intent.getExtras().containsKey("JOBID") && (intent.getFlags() & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) == 0) {     int jobID = this.getIntent().getExtras().getInt("JOBID");      if (jobID > 0) {      } }