Скачать или смотреть flutter tutorial dropdown menu in flutter

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certainly! in this tutorial, we'll learn how to create a dropdown menu in flutter. a dropdown menu is a commonly used widget that allows users to select one option from a set of options. in flutter, we can implement a dropdown using the `dropdownbutton` widget.

step-by-step tutorial

1. setting up your flutter environment

before we begin, ensure that you have flutter installed on your machine and a new flutter project created. you can create a new project using the following command:

```bash
flutter create dropdown_menu_example
```

navigate to the project directory:

```bash
cd dropdown_menu_example
```

2. open the project

open the project in your preferred ide (like vscode, android studio, etc.).

3. modify the main dart file

open the `lib/main.dart` file and replace its contents with the following code:

```dart
import 'package:flutter/material.dart';

void main() {
runapp(myapp());
}

class myapp extends statelesswidget {
@override
widget build(buildcontext context) {
return materialapp(
title: 'dropdown menu example',
theme: themedata(
primaryswatch: colors.blue,
),
home: dropdownmenudemo(),
);
}
}

class dropdownmenudemo extends statefulwidget {
@override
_dropdownmenudemostate createstate() = _dropdownmenudemostate();
}

class _dropdownmenudemostate extends statedropdownmenudemo {
string? dropdownvalue; // variable to hold the selected value

// list of dropdown items
final liststring items = [
'option 1',
'option 2',
'option 3',
'option 4',
];

@override
widget build(buildcontext context) {
return scaffold(
appbar: appbar(
title: text('dropdown menu example'),
),
body: center(
child: dropdownbuttonstring(
value: dropdownvalue,
hint: text('select an option'), // placeholder when no value is selected
items: items.map((string item) {
return dropdownmenuitemstring(
value: ...

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