back_button_interceptor #

The BackButtonInterceptor may be used to intercept the Android back-button, as an alternative to WillPopScope.

You may set a function to be called when the back button is tapped. This function may perform some useful work, and then, if it returns false, the default button process (usually popping a Route) will not be fired.

Note: Only one function may be defined at a time, and setting a function will remove the previous one. After you've finished you MUST remove the function by setting it to null, or calling the remove() method.

Usage #

Import the package #

First, add back_button_interceptor as a dependency in your pubspec.yaml

Then, import it:

import 'package:back_button_interceptor/back_button_interceptor.dart';

Example usage #

@override
void initState() {
    super.initState();
    BackButtonInterceptor.set(() {
       print("BACK BUTTON!");
       return false;
       });
}

 @override
 void dispose() {
    BackButtonInterceptor.remove();
    super.dispose();
 }

Don't forget to check the example tab.

See also:

• https://docs.flutter.io/flutter/widgets/WillPopScope-class.html
• https://stackoverflow.com/questions/45916658/de-activate-system-back-button-in-flutter-app-toddler-navigation