Add support of namespace property to support Android Gradle Plugin (A…

[Skyost]

Description

This PR adds support of namespace property to support Android Gradle Plugin (AGP) 8. It fixes the following error :

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':game_services'.
> Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
   > Namespace not specified. Please specify a namespace in the module's build.gradle file like so:

     android {
         namespace 'com.example.namespace'
     }

     If the package attribute is specified in the source AndroidManifest.xml, it can be migrated automatically to the namespace value in the build.gradle file using the AGP Upgrade Assistant; please refer to https://developer.android.com/studio/build/agp-upgrade-assistant for more information.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
Running Gradle task 'bundleRelease'...                           2 150ms
Gradle task bundleRelease failed with exit code 1

See flutter/flutter#125181 (comment).

Upgrade instructions

All Flutter projects should upgrade their child Android project to use AGP 8. In the android/build.gradle :

buildscript {
  // ...

  dependencies {
    classpath 'com.android.tools.build:gradle:8.0.1'
    // ...
  }
}

Also, a namespace is required in the android section of android/app/build.gradle :

android {
  // ...
  namespace 'your.namespace'
}

Note

There's a way to still support AGP 4.2. All we have to do is :

if (project.android.hasProperty("namespace")) {
  namespace 'com.abedalkareem.games_services'
}

But I'm not sure that it's the best idea as AGP 4.2 is old. As you want, I can adapt my PR if you ask to 🙂

[Skyost]

Oops, wrong branch name ! Will submit a new PR.