how to disable phone back press in flutter

Question

I am new to Flutter development. Can anyone share me how to disable the back press in flutter?

In Android, we can use onbackpressed method.

@Override
public void onBackPressed() {
  // super.onBackPressed(); commented this line in order to disable back press
  //Write your code here
  Toast.makeText(getApplicationContext(), "Back press disabled!", Toast.LENGTH_SHORT).show();
}

In flutter how it possible to do?

Answer 1

Wrap your widget inside WillPopScope and return a false Future in the onWillPop property

    @override
    Widget build(BuildContext context) {
      return WillPopScope(
        onWillPop: () => Future.value(false),
        child: Scaffold(
          appBar: AppBar(
            title: const Text("Home Page"),
          ),
          body: Center(
            child: const Text("Home Page"),
          ),
        ),
      );
    }

Refer to this documentation: https://api.flutter.dev/flutter/widgets/WillPopScope-class.html

Answer 2

The easiest way is to use WillPopScope but here's an alternative method if for some reason you don't want to or can't use the WillPopScope widget.

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  ModalRoute<dynamic> _route;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    _route?.removeScopedWillPopCallback(_onWillPop);
    _route = ModalRoute.of(context);
    _route?.addScopedWillPopCallback(_onWillPop);
  }

  @override
  void dispose() {
    _route?.removeScopedWillPopCallback(_onWillPop);
    super.dispose();
  }

  Future<bool> _onWillPop() => Future.value(false);

  @override
  Widget build(BuildContext context) => Container();
}