what is the equivalent method of onbackpressed in flutter

Question

I want the same onBackPressed logic of Android in flutter application and I want to close the app when I click on phone back button.

Can any one tell me how to do this when we click on phone back not app back button.

android:

@Override
public void onBackPressed()
{
     // code here to show dialog
     super.onBackPressed();  // optional depending on your needs
}

Possible duplicate of [catch Android back button event on Flutter](https://stackoverflow.com/questions/50452710/catch-android-back-button-event-on-flutter) — Jordan Davies, Jan 22 '19 at 12:27
Refer to this post: https://stackoverflow.com/questions/49356664/how-to-override-the-back-button-in-flutter — Ishant, Jan 22 '19 at 12:31
@Ishant i think WillPopScope is for app back button ,,,,not for phone back button right? — kartheeki j, Jan 22 '19 at 12:35

score 29 · Accepted Answer · answered Jan 22 '19 at 13:12

29

You can use WillPopScope for that. It's a class that notifies you when the enclosing ModalRoute (internally used with the Navigator) is about to be popped. It even leaves you a choice to whether or not you want the pop to happen.

Just wrap the second screen's Scaffold in a WillPopScope.

return WillPopScope(
  onWillPop: () async {
    // You can do some work here.
    // Returning true allows the pop to happen, returning false prevents it.
    return true;
  },
  child: ... // Your Scaffold goes here.
);

answered Jan 22 '19 at 13:12

Marcel

8,831
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2

Drawback of this solution is that back gesture on iOS then is no longer working. – Timo Bähr Aug 09 '20 at 15:19
in android device getting a black screen with WillPopScope tried all solutions with a navigator in flutter – s.j Dec 22 '20 at 10:12

Ankit · Answer 2 · 2019-09-26T05:25:03.347

5

Hope this will help...

Future<bool> _onBackPressed() async {
    // Your back press code here...
    CommonUtils.showToast(context, "Back presses");
}

WillPopScope creates a widget that registers a callback to veto attempts by the user to dismiss the enclosing ModalRoute.

@override 
Widget build(BuildContext context) {
    return new WillPopScope(
        onWillPop: _onBackPressed,
        child: ...child
    );
}

edited Sep 26 '19 at 05:25

answered Sep 26 '19 at 04:36

Ankit

135
1
8

Please explain why this solution works. https://stackoverflow.com/help/how-to-answer – Marcello B. Sep 26 '19 at 04:56

score 0 · Answer 3 · answered Jul 16 '21 at 06:59

0

You can use Navigator.pop(context); or Navigator.maybePop(context);;

And maybePop can be listened by WillPopScope#onWillPop；

answered Jul 16 '21 at 06:59

linkaipeng

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what is the equivalent method of onbackpressed in flutter

3 Answers3