Flutter辅助触控插件assistive_touch的使用

Flutter辅助触控插件assistive_touch的使用

安装插件

首先，你需要在你的项目中安装assistive_touch插件。你可以通过以下命令来安装：

flutter pub add assistive_touch

导入插件

接下来，在你的 Dart 文件中导入 assistive_touch 插件。

import 'package:assistive_touch/assistive_touch.dart';

创建基本计数器页面

创建一个简单的的计数器页面，用于展示如何使用辅助触控功能。

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

  final String title;

  [@override](/user/override)
  _MyHomePageState 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: [
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

将浮动按钮移动到辅助触控

为了将浮动按钮移动到辅助触控上，我们需要在构建方法中添加一个 Stack 组件，并将浮动按钮放在辅助触控组件内。

class _MyHomePageState extends State<MyHomePage> {
  [@override](/user/override)
  Widget build(BuildContext context) {
    // 首先包裹一个 Stack 组件
    return Stack(
      children: [
        Scaffold(
          // ...
        ),
        AssistiveTouch(
          // 将浮动按钮移动到这里
          child: FloatingActionButton(
            onPressed: _incrementCounter,
            tooltip: 'Increment',
            child: Icon(Icons.add),
          ),
        ),
      ],
    );
  }
}

现在你已经成功地将浮动按钮移动到了辅助触控上，用户可以通过辅助触控来触发这个按钮。

示例代码

以下是完整的示例代码，包括上述所有步骤。

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

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

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

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

  final String title;

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

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

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

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Stack(
      children: [
        Scaffold(
          appBar: AppBar(
            title: Text(widget.title),
          ),
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Text(
                  ' you have pushed the button this many times:',
                ),
                Text(
                  ' $_counter',
                  style: Theme.of(context).textTheme.headline4,
                ),
              ],
            ),
          ),
        ),
        AssistiveTouch(
          onTap: _incrementCounter,
        ), // 这里的逗号是尾随逗号，使代码更整洁
      ],
    );
  }
}