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.

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.

These enhancements collectively underscore Android Studio’s commitment to providing developers with powerful tools, making the app development journey more intuitive, efficient, and feature-rich.