title: What is the difference between Extends Application and Extends Activity in Android?
body: <p>I am confused as to the difference between the two. In my application I have just used Extends Activity and the application is working perfectly, so what is the purpose of Extends Application?. </p>
  
  <p>Would you use it on the first class you create in the Android application?</p>
  
  <p>Thanks.</p>