Starting app only if its not currently running

Question

I am sending push notification to users which when clicking on it opens the app.

My problem is that when the app is already open, clicking on the notification start

Answer 1

Use Splash as Fragment instead of Activity. Keep Splash fragment(7 seconds), replace the same with the desired one(landing page).

Add launchMode="singleTask" to the manifest.

As already stated by Rahul, onNewIntent() get called if application is already running else onCreate()

@Override
protected void onNewIntent(Intent intent) 
{   
    super.onNewIntent(intent);
}

OR

Go with David's answer, seems promising.