Explore Java for mobile app development: how to create Android apps in 2025 with this reliable programming language.

Fortunately, that’s pretty easy as Android Studio has already shown us how to do it. Open up MainActivity.java and look for the text that says “Replace with your own action”.

Start by double clicking the XML file in Android Studio that corresponds to the first activity for your app. By default, the first activity will be ‘MainActivity.java’ and your XML file for ...