title: How to make a simple touch screen test application?
body: <p>I want to make a simple touch screen test application like Samsung Device Diagnostic Tool.</p>
  <p>A screenshot from Samsung Device Diagnostic Tool: <a href="https://i.stack.imgur.com/7KgKW.jpg" rel="nofollow noreferrer">http://i.stack.imgur.com/7KgKW.jpg</a></p>
  <p>I'm not very familiar with Android App Development. Which way would you suggest me to make a simple application like the tool I mentioned above?</p>