CODEWITHSUNDEEP
flutter
Suman Kumar
Suman Kumar

Reputation: 69

on pressing back button on device my app should close without going to any previous screens in Flutter

I am wondering if anyone knows how to use the device back button to exit the app without going back to any previous pages/routes.

  Future<bool> _onBackPressed() {
return showDialog(
      context: context,
      builder: (context) => new AlertDialog(
        title: new Text('Are you sure?'),
        content: new Text('Do you want to exit an App'),
        actions: <Widget>[
          new GestureDetector(
            onTap: () => Navigator.of(context).pop(false),
            child: Text("NO"),
          ),
          SizedBox(height: 16),
          new GestureDetector(
            onTap: () {
              Navigator.pushReplacement(
                context,
                MaterialPageRoute(builder: (context) => WelcomeScreen()),
              );
            },
            child: Text("YES"),
          ),
        ],
      ),
    ) ??
    false;

}

Upvotes: 0

Views: 601

Answers (2)

Kaki Master Of Time
Kaki Master Of Time

Reputation: 1614

To programmatically exit flutter apps, you need to pop the systemNavigator like follow :

SystemNavigator.pop()

SystemNavigator is available after importing Services :

import 'package:flutter/services.dart';

An other method is to use exit(0) which would terminate the app but is usually not user Interface friendly especially on iOS.

Upvotes: 1

Shubhamhackz
Shubhamhackz

Reputation: 7963

You can exit your app using following ways:

  1. SystemChannels.platform.invokeMethod<void>('SystemNavigator.pop', animated)

  2. exit(0)

  3. SystemNavigator.pop()

Although all three ways works but the preferred way of doing this is to use SystemNavigator.pop(). The method looks like this:

static Future<void> pop({bool animated}) async {
  await SystemChannels.platform.invokeMethod<void>('SystemNavigator.pop', animated);
}

exit(0)is not a recommended way as it immediately terminates the process running in dart VM and looks a bit like your app is crashed.

Upvotes: 0

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