title: Activity re-loading with AdMob
body: <p>I have the following issue, where I load an ad with AdMob on my home screen. While it is busy loading the user can navigate away to another activity. If the ad didn't finish loading before then, it automatically takes the user back to the home screen from it's current activity. </p>
  
  <p>So how do I either block the user to navigate away while the ad is loading (though I don't really want to do that) OR how do I stop the ad from loading if the user navigates away?</p>
  
  <p>Basically, how can I improve the user experience and not have them have to wait for the ad to finish loading, but still have the ad present at a later stage</p>
  
  <p>Much appreciate any advice!</p>