You need to ask some existing member to get android/app/release.gradle and place it.
Run the command in the following to generate a launcher icon:
flutter packages pub run flutter_launcher_icons:main -f ./flutter_launcher_icons.yaml
You can make sure whether Firebase Analytics events you attached to some action works correctly with DebugView. In order to use it, you need to enable Analytics Debug Mode with the following command:
adb shell setprop debug.firebase.analytics.app app.axross.saraka
Note: Usually your machine has path to adb, but it doesn't if you installed Android SDK on Android Studio. In that case, you can find adb in ~/Library/Android/sdk/platform-tools (macOS).
If you want to disable it, you can do it with the following one:
adb shell setprop debug.firebase.analytics.app .none.