android_window 
A flutter plugin allows you to create native android floating window.
Install
flutter pub add android_window
MainActivity.kt:
class MainActivity : qiuxiang.android_window.AndroidWindowActivity()
Create MainApplication.kt:
package your_package // same as MainActivity.kt
class MainApplication : qiuxiang.android_window.AndroidWindowApplication()
Add android:name=".MainApplication" to AndroidManifest.xml
:
">
<application android:name=".MainApplication" ... >
Example
main.dart:
import 'package:android_window/main.dart' as android_window;
import 'package:flutter/material.dart';
import 'android_window.dart';
@pragma('vm:entry-point')
void androidWindow() {
runApp(const AndroidWindowApp());
}
void main() {
runApp(const App());
}
class App extends StatelessWidget {
const App({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(title: 'Flutter Demo', home: HomePage());
}
}
class HomePage extends StatelessWidget {
const HomePage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: () => android_window.open(size: const Size(300, 200)),
child: const Icon(Icons.add),
),
);
}
}
android_window.dart:
import 'package:android_window/android_window.dart';
import 'package:flutter/material.dart';
class AndroidWindowApp extends StatelessWidget {
const AndroidWindowApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: HomePage(),
debugShowCheckedModeBanner: false,
);
}
}
class HomePage extends StatelessWidget {
const HomePage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return AndroidWindow(
child: Scaffold(
backgroundColor: Colors.lightGreen.withOpacity(0.9),
body: const Padding(
padding: EdgeInsets.all(8),
child: Text('Hello android window'),
),
),
);
}
}
Screenshot:
More examples
example.mp4
Build
mkdir -p android/src/main/java/qiuxiang/android_window
flutter pub run pigeon --input lib/pigeon.dart
, but in my overlay widget, it's not working, like copy paste is not working too, here is a picture
, This is a simple code example reproducing the issue: 
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