title: Test if Multiple EditTexts are empty
body: <p>Say I have multiple EditTexts in an application. When I click a Button, I want to test what EditTexts are empty and what EditTexts have content. I also want the id of the EditText whose content is NOT empty. How would I do that? Could someone write the code for the Button click handler. My six EditText's ids are FirstString, SecondString, ThirdString, ... The Button's id is button.</p>