Flutter虚拟键盘功能插件flutter_virtual

Flutter虚拟键盘功能插件flutter_virtual_keyboard的使用

此插件提供了一个虚拟键盘，可以集成到Web和桌面应用中。它允许用户无需物理键盘即可输入文本，特别适用于触摸屏设备或无障碍用途。

示例代码

以下是使用flutter_virtual_keyboard插件的完整示例代码：

import 'package:flutter/material.dart';
import 'package:flutter_virtual_keyboard/virtual_keyboard.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // 此小部件是您的应用的根。
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final TextEditingController _textEditingController = TextEditingController();
  final TextEditingController _textEditingController2 = TextEditingController();
  final ScrollController _scrollController = ScrollController();
  final ScrollController _scrollController2 = ScrollController();

  @override
  Widget build(BuildContext context) {
    return VirtualKeyboardScaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: [
            SizedBox(
              width: 300,
              child: VirtualKeyboardInput(
                inputController: _textEditingController,
                scrollController: _scrollController,
              ),
            ),
            // SizedBox(
            //   width: 300,
            //   child: VirtualKeyboardInput(
            //     inputController: _textEditingController2,
            //     scrollController: _scrollController2,
            //   ),
            // ),
            InkWell(
              onTap: () {},
              child: Container(
                height: 50,
                width: 50,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

代码解释

导入必要的库：

import 'package:flutter/material.dart';
import 'package:flutter_virtual_keyboard/virtual_keyboard.dart';

主应用类 (MyApp)：

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

主页面类 (MyHomePage)：

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

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

状态类 (_MyHomePageState)：

class _MyHomePageState extends State<MyHomePage> {
  final TextEditingController _textEditingController = TextEditingController();
  final TextEditingController _textEditingController2 = TextEditingController();
  final ScrollController _scrollController = ScrollController();
  final ScrollController _scrollController2 = ScrollController();

  @override
  Widget build(BuildContext context) {
    return VirtualKeyboardScaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: [
            SizedBox(
              width: 300,
              child: VirtualKeyboardInput(
                inputController: _textEditingController,
                scrollController: _scrollController,
              ),
            ),
            // SizedBox(
            //   width: 300,
            //   child: VirtualKeyboardInput(
            //     inputController: _textEditingController2,
            //     scrollController: _scrollController2,
            //   ),
            // ),
            InkWell(
              onTap: () {},
              child: Container(
                height: 50,
                width: 50,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

更多关于Flutter虚拟键盘功能插件flutter_virtual_keyboard的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

songsunli 1楼•3 天前

更多关于Flutter虚拟键盘功能插件flutter_virtual_keyboard的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

在Flutter项目中集成和使用flutter_virtual_keyboard插件来实现虚拟键盘功能，可以通过以下步骤进行。flutter_virtual_keyboard插件允许你在Flutter应用中显示一个自定义的虚拟键盘，这对于一些特定的应用场景（如嵌入式系统、游戏等）非常有用。

步骤1：添加依赖

首先，你需要在pubspec.yaml文件中添加flutter_virtual_keyboard的依赖：

dependencies:
  flutter:
    sdk: flutter
  flutter_virtual_keyboard: ^x.y.z  # 请使用最新版本号替换x.y.z

然后运行flutter pub get来获取依赖。

步骤2：导入插件

在你的Flutter项目中，导入flutter_virtual_keyboard插件：

import 'package:flutter_virtual_keyboard/flutter_virtual_keyboard.dart';

步骤3：配置键盘

你需要配置键盘的布局和按钮。以下是一个简单的例子，展示如何创建和显示一个基本的虚拟键盘：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Virtual Keyboard Example'),
        ),
        body: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            children: [
              TextField(
                decoration: InputDecoration(
                  labelText: 'Enter Text',
                ),
                controller: _controller,
                onEditingComplete: () {
                  // 处理文本输入完成事件
                },
                onSubmitted: (value) {
                  // 处理文本提交事件
                },
              ),
              SizedBox(height: 16),
              Expanded(
                child: VirtualKeyboard(
                  keyboardData: _keyboardData,
                  onKeyPress: (key) {
                    // 处理按键事件
                    setState(() {
                      _controller.text += key;
                    });
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

final TextEditingController _controller = TextEditingController();

final List<Map<String, dynamic>> _keyboardData = [
  {
    'row': [
      {'key': '1'},
      {'key': '2'},
      {'key': '3'},
      {'key': '+'},
    ],
  },
  {
    'row': [
      {'key': '4'},
      {'key': '5'},
      {'key': '6'},
      {'key': '-'},
    ],
  },
  {
    'row': [
      {'key': '7'},
      {'key': '8'},
      {'key': '9'},
      {'key': '*'},
    ],
  },
  {
    'row': [
      {'key': 'C', 'action': 'clear'},  // 清空按钮
      {'key': '0'},
      {'key': '='},
      {'key': '/'},
    ],
  },
];

步骤4：处理键盘事件

在上面的代码中，我们定义了一个简单的虚拟键盘布局，并通过onKeyPress回调来处理按键事件。每当用户点击一个按键时，相应的字符会被添加到TextField中。

额外功能

你还可以添加更多功能，比如：

自定义按键样式：通过传递更多的参数到VirtualKeyboard组件中来自定义按键的样式。
处理特殊按键：比如删除键、回车键等。
布局优化：根据设备屏幕尺寸调整键盘布局。

这些功能可以通过进一步修改_keyboardData和VirtualKeyboard组件的配置来实现。

结论

通过上述步骤，你可以在Flutter应用中集成和使用flutter_virtual_keyboard插件来显示一个自定义的虚拟键盘。这个插件提供了灵活的键盘布局配置和事件处理机制，能够满足各种应用场景的需求。