Resolving the Flutter App Build Failure Due to Invalid Package Name

Learn how to fix the `Flutter app build failure` caused by an improperly formatted package name in the AndroidManifest.xml file.
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This video is based on the question https://stackoverflow.com/q/70294796/ asked by the user 'MNBWorld' ( https://stackoverflow.com/u/17411652/ ) and on the answer https://stackoverflow.com/a/70324569/ provided by the user 'Suganya' ( https://stackoverflow.com/u/6607896/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Why is My Flutter App Not Building?

If you've ever tried building a Flutter app and encountered errors, you're not alone. A common problem many developers face is when their app fails to build due to issues in the configuration files, particularly the AndroidManifest.xml. One specific error message that can throw off even experienced developers is regarding the package name.

The Problem: Package Name Error

When attempting to launch a Flutter app, you might receive an error like this:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that the package name you've specified in your AndroidManifest.xml file is not correctly formatted. The Flutter framework requires that package names contain at least one dot, following Java's naming conventions for packages.

Solution: Correcting Your Package Name

The solution to the problem is straightforward: you need to edit the AndroidManifest.xml file to include a valid package name. Below are the steps to guide you through this process:

Step 1: Locate the AndroidManifest.xml File

Navigate to your Flutter project directory.

Open the folder: /android/app/src/main/.

Look for the AndroidManifest.xml file.

Step 2: Edit the Package Name

Within the AndroidManifest.xml, you will find a line that looks similar to this:

[[See Video to Reveal this Text or Code Snippet]]

The current package name BMI is incorrect because it does not contain a dot. To fix this, you should change it to a conventional format, such as com.bmi. Here’s the corrected section of the file:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Include Additional Configurations

While you're in the AndroidManifest.xml, ensure to retain or add permissions and application configurations that your app might need. Here’s how a more complete AndroidManifest.xml may look:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Rebuild Your App

Once you've made the necessary changes, save the file and run the following command in your terminal to rebuild your app:

[[See Video to Reveal this Text or Code Snippet]]

This should successfully compile your Flutter application without the previous error.

Conclusion

By following the steps above and ensuring your package name conforms to the required format (with at least one dot), you can resolve the build failure issue in your Flutter app. Proper configuration is crucial for a seamless development process, so always pay attention to details in your AndroidManifest.xml. Happy coding!

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