Simple but may be useful
Android Xml Layout To Flutter Scaffold Converter - Completely free
If you need to quickly convert most of your Android XML layouts into Dart Scaffold files then you can just try this online free converter. It is not perfect and does not support all Android UI elements and containers but in most cases it will make your life easier and create much DART files for you to start migrating your Java UI to Flutter UI.
Android Xml Layout to Flutter Scaffold Converter