How to Change Your Android App's Package Name Correctly Changing your Android app's package name is a common task, but doing it incorrectly can break your build, disrupt services like Firebase, or even create a new app on the Play Store. This guide will walk you through the safe way to refactor your package name and explain the critical nuances. The Two Types of "Package Name" It's crucial to understand the difference between two concepts: The Code Package Name: Defined in your AndroidManifest.xml , this is the root package for your source code and R classes. The Application ID: Defined in your build.gradle file, this is the unique identifier for your app on the Google Play Store and for services like Firebase and AdMob. You can change the first without changing the second. Step-by-Step: How to Refactor Your Package Name Follow these steps inside Android Studio to rename your code package safely. 1. Update the AndroidManifest.xml Open you...