title: Android - Calculator help / source wanted
body: <p>I know Android is open source, but are all the apps that they make open source?</p>
  
  <p>Is there a way I can get my hands on the Android Calculator source?</p>
  
  <p>Otherwise, can someone point me in the direction to an open source calculator, or a tutorial to make one?</p>
  
  <p>Thanks!</p>