title: Multiple Activities adMob
body: <p>I have 9 Activities in my project
  I want to display admob selected activities
  but, if I implements in each activities, 
  it shows difference one and little slow.</p>
  
  <p>Also, how to make InterstitialAd?</p>
  
  <p>can anybody give me some example code
  and perfect explanation?</p>
  
  <p>Thanks</p>