Yes, you can change the package name of a Flutter project. Here are the steps to follow:
Open the pubspec.yaml file in your project and change the name field to your desired package name. Make sure the name follows the package naming conventions, which is typically in reverse domain name notation (e.g., com.example.myapp).
Next, open the android/app/build.gradle file in your Android project and change the applicationId field to your desired package name. This is important because the Android build system uses this value to generate the APK file.
If you're using Firebase, you'll need to update the package name in your Firebase console settings as well.
Finally, you can update the application name by changing the label field in the AndroidManifest.xml file in the android/app/src/main directory.
After making these changes, you should clean and rebuild your project for the changes to take effect. You can do this by running flutter clean and then flutter run or flutter build. Note that changing the package name may affect other parts of your project, such as dependencies and plugin integrations, so you should test your app thoroughly after making the changes.
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