Flutter下拉选择插件easy_dropdown的使用

Flutter下拉选择插件easy_dropdown的使用

特性

这个包是为在Flutter中构建下拉菜单而设计的。这个包对于下拉项目来说非常简单。你只需要传递一个项目列表即可。

示例代码

SizedBox(
    width: MediaQuery.of(context).size.width * 0.90,
    height: 50,
    child: EasyDropdown(
    listItems: ["Option 1", "Option 2", "Option 3"],
    hintText: "Select option",
  ),
),

开始使用

在pubspec.yaml文件中添加依赖项：

dependencies:
  easy_dropdown: ^0.0.4

使用方法

SizedBox(
    width: MediaQuery.of(context).size.width * 0.90,
    height: 50,
    child: EasyDropdown(
    listItems: ["Option 1", "Option 2", "Option 3"],
    hintText: "Select option",
  ),
),

完整示例代码

以下是一个完整的示例代码，展示了如何在Flutter应用中使用easy_dropdown插件：

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

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  [@override](/user/override)
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            SizedBox(
                width: MediaQuery.of(context).size.width * 0.90,
                height: 50,
                child: const AppDropdown(
                    listItems: ["Option 1", "Option 2", "Option 3"],
                    hintText: "Select option")),
            const SizedBox(
              width: 200,
              height: 60,
              child: EasyDropdown(
                listItems: ["1", "2"],
                hintText: "Hint text",
                selectedOption: "Select option",
              ),
            ),
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}