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Go to folder Android, localate the document Gradlew. Click in open in terminal and write this command "./gradlew signingreport"
Flutter sample code https://developer.huawei.com/consumer/en/doc/development/HMS-Plugin-Examples/flutter-sample-code-0000001050185943
Change package name and application name in flutter project https://stackoverflow.com/questions/51534616/how-to-change-package-name-in-flutter
flutter pub run change_app_package_name:main com.package.appname