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.

If you followed along in Part 2, you’ve already loaded your source code and resource files into your Android Studio project. Now you’re ready to build the app for the first time.

To build the Calculator app, you’ll need a Windows 10 computer and Visual Studio. You might think that this is the same code that’s been shipping for 30 years — it’s a simple calculator ...