How to Make Double Press Back Button to Exit on Flutter App

In this example, we are going to show you how to make double press the back button to exit the app on Flutter. We are not going to use any package to achieve this feature. See the example below:

See this also: How to override Back Button and Show Exit Confirm in Flutter App

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp( 
      home: MyApp()
  ));
}

class MyApp extends StatefulWidget{
  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

  var ctime;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
          body: WillPopScope(

             onWillPop: () {
                DateTime now = DateTime.now();
                if (ctime == null || now.difference(ctime) > Duration(seconds: 2)) { 
                     //add duration of press gap
                    ctime = now;
                    ScaffoldMessenger.of(context).showSnackBar(
                       SnackBar(content: Text('Press Back Button Again to Exit')) 
                    ); //scaffold message, you can show Toast message too.
                    return Future.value(false);
                }

                return Future.value(true);
             },

             child: Container( 
                color: Colors.lightBlue,
                //your content goes here.
             )
          )
      );
  }
}