This is a complete tutorial, discussing how to build a simple calculator app for Android. Check it out, and implement some of the recommended improvements.

Learn to code a simple Android widget that can be updated automatically (after a time period), or in response to user action. Full source code included.

Flibbo is now a Top 100 app in the U.S. Apple App Store, attracting over 500,000 users globally and generating more than $1.2 ...