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.

Building your Android app If you followed along in Part 2, you’ve already loaded your source code and resource files into your Android Studio project.

However, it is very difficult to develop a calculator that can display accurate answers, and as an example, engineer Chad Nauseam explains how the 'Calculator' app installed on Android was developed.

Without any doubt, Android is the world’s most commonly used mobile operating system. To many, it presents quite an opportunity and a large, lucrative market for app developers. Creating top-notch and ...