Flutter Conversion From JAVA

I have an android mobile app source code which is integrated with REST API. The backend (i.e.,base URL, Admin Panel) is written in PHP and Android code(UI Part) is written in JAVA and integrated with API PHP Code. Now i want to change the JAVA part to Dart code and integrate it with the existing REST API for the Android App. Or is there any other better ideas.

Purpose is I’m not familiar with JAVA for building Android Project. So needing it in Dart to work in Flutter. Thanks in advance.

Tried to convert to Kotlin in Android Studio. It’s not helping.