[Handling Back Button in Flutter] #Flutter

handling_back_button.dart

class MyApp extends StatelessWidget {
  Future<bool> _onBackPressed() {
    // true -> go back
    // false -> back cancel
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('title'),
      ),
      body: WillPopScope(
        onWillPop: _onBackPressed,
        child: Container(),
      ),
    );
  }
}