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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...

How to Fix the "Duplicate Class ListenableFuture" Error in Android If you're working on an Android project and see a build error about a duplicate   ListenableFuture   class, you've encountered a common dependency conflict. This guide will explain why it happens and show you how to fix it. Understanding the Error The error message looks like this: Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules: guava-23.0.jar (com.google.guava:guava:23.0) and listenablefuture-1.0.jar (com.google.guava:listenablefuture:1.0)  This means two different libraries in your project are trying to provide the same class, causing a collision. guava-23.0.jar   contains the full Guava library, which includes   ListenableFuture . listenablefuture-1.0.jar   is a standalone, minimal artifact containing only the   ListenableFuture   class. The conflict arises when one of your dependencies requires the standalone JAR, but your project also inclu...

Fixing the "JAVA_HOME is not set" Error: A Complete Guide Encountering the error   ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH   is a common hurdle for developers. This error means your system can't find a Java Development Kit (JDK), which is essential for running tools like Gradle for Android development. This guide will walk you through checking for a JDK, installing one if needed, and correctly setting the   JAVA_HOME   environment variable on Windows, macOS, and Linux. 1. Check if Java is Installed First, verify if Java is already on your system but not properly configured. Open a   Command Prompt   (Windows) or   Terminal   (macOS/Linux). Run the following commands: echo %JAVA_HOME% java -version If these commands return a version number, Java is installed. If you get an error like   command not found , you need to install a JDK. 2. Install a JDK (If Needed) If you don't have a JDK, you need to install ...