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global key flutter

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Hacked.fyi answered on January 6, 2023 Popularity 9/10 Helpfulness 5/10

answer global key flutter

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global key flutter

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In Flutter, a GlobalKey is a unique identifier that is used to identify a specific StatefulWidget within the app. It allows you to access the state of the widget and modify it, even if the widget is located in another part of the app's widget hierarchy.

Here is an example of how you can use a GlobalKey in Flutter:

Copy code
import 'package:flutter/material.dart';

void main() {
  final key = GlobalKey<MyStatefulWidgetState>();

  runApp(
    MaterialApp(
      home: MyStatefulWidget(key: key),
    ),
  );
}

class MyStatefulWidget extends StatefulWidget {
  MyStatefulWidget({Key key}) : super(key: key);

  @override
  MyStatefulWidgetState createState() => MyStatefulWidgetState();
}

class MyStatefulWidgetState extends State<MyStatefulWidget> {
  int counter = 0;

  void incrementCounter() {
    setState(() {
      counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Text(counter.toString());
  }
}
In this example, a GlobalKey named key is created and used to identify a MyStatefulWidget within the app. The MyStatefulWidget is a StatefulWidget that displays a counter and provides a method for incrementing the counter. The GlobalKey allows you to access the state of the MyStatefulWidget and modify the counter from any other part of the app.

I hope this helps! Let me know if you have any other questions.

Popularity 9/10 Helpfulness 5/10 Language whatever

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Tags: flutter global key whatever

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Contributed on Jan 06 2023

Hacked.fyi

0 Answers Avg Quality 2/10

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A GlobalKey in Flutter is a unique key that is used to identify and manipulate a specific element in the widget tree, such as a stateful widget. Global keys are useful in cases where you need to reference a specific widget that may not be a parent or child of the current widget, for example, if you need to show a dialog box and reference a specific form field within the dialog.

It can be used with different widget like Form, SnackBar and Navigator

You can create a GlobalKey by instantiating the GlobalKey<T> class, where T is the type of the widget that you want to associate the key with. For example, you can create a GlobalKey<FormState> to reference the state of a form widget.

Once you have created a GlobalKey, you can use it to reference the widget by calling the currentState property, which returns the current state of the widget.

You should also keep in mind that GlobalKey should be unique and should not be recreated.

Popularity 9/10 Helpfulness 4/10 Language dart

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Tags: dart

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Contributed on Jan 11 2023

Barkerbg001

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global key flutter

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import 'package:flutter/material.dart';

// Create a global key
GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        key: _scaffoldKey, // Assign the global key to the Scaffold
        appBar: AppBar(
          title: Text('Global Key Example'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('Show Snackbar'),
            onPressed: () {
              // Use the global key to show a snackbar
              _scaffoldKey.currentState.showSnackBar(
                SnackBar(content: Text('Hello, Flutter!')),
              );
            },
          ),
        ),
      ),
    );
  }
}

Popularity 7/10 Helpfulness 4/10 Language dart

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Contributed on Sep 12 2023

YOU.com

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global key flutter

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