Flutter Example - WillPopScope | Handel back button pressed

import 'package:flutter/material.dart';

class WillPopScopeDemo extends StatelessWidget {
  DateTime currentBackPressTime;

  final scaffoldKey = GlobalKey<ScaffoldState>();

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async {
        bool result = onPressBackButton();
        return await Future.value(result);
      },
      child: Scaffold(
        key: scaffoldKey,
        appBar: AppBar(title: Text("WillPopScope Demo")),
        body: Center(
          child: Text("Tap back button to leave this page"),
        ),
      ),
    );
  }

  bool onPressBackButton() {
    DateTime now = DateTime.now();
    if (currentBackPressTime == null ||
        now.difference(currentBackPressTime) > Duration(seconds: 2)) {
      currentBackPressTime = now;
      scaffoldKey.currentState
        ..hideCurrentSnackBar()
        ..showSnackBar(SnackBar(
          content: Text("Tap back again to leave."),
        ));
      return false;
    }
    return true;
  }
}

 

 

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