title: Initialize Google Mobile Ads SDK (Admob) only once?
body: <p>if we need to initialise Admob SDK then should we initialise it for once at MainActivity.class or  there's need to initialise it in every activity in which Admob Ads are present? </p>
  
  <p>As per this link : <a href="https://firebase.google.com/docs/admob/android/quick-start" rel="noreferrer">https://firebase.google.com/docs/admob/android/quick-start</a>  "To initialize the Google Mobile Ads SDK at app launch, call MobileAds.initialize() in the onCreate() method of the MainActivity class." </p>
  
  <p>So should we call it only once for every Ads in different activity? </p>