Flutter屏幕亮度控制插件brightness的使用

Flutter屏幕亮度控制插件brightness的使用

在Flutter中，brightness 插件可以帮助开发者轻松地控制设备的屏幕亮度。以下是如何使用该插件的详细说明，包括完整的示例代码。

获取开始

首先，确保你已经在 pubspec.yaml 文件中添加了 brightness 插件依赖：

dependencies:
  brightness: ^0.2.0

然后运行 flutter pub get 来安装依赖。

使用示例

以下是一个完整的示例代码，展示如何使用 brightness 插件来获取和控制屏幕亮度。

示例代码

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

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

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

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  // 当前屏幕亮度值
  double currentBrightness = 0.0;

  [@override](/user/override)
  void initState() {
    super.initState();
    // 初始化时获取当前屏幕亮度
    WidgetsBinding.instance.addPostFrameCallback((_) async {
      currentBrightness = await Brightness().getBrightness();
      setState(() {});
    });
  }

  // 设置屏幕亮度
  Future<void> setBrightness(double value) async {
    await Brightness().setBrightness(value);
    setState(() {
      currentBrightness = value;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('屏幕亮度控制示例'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                "当前屏幕亮度: $currentBrightness",
                style: TextStyle(fontSize: 18),
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: () async {
                  // 将亮度设置为最大值
                  await setBrightness(1.0);
                },
                child: Text("设置最大亮度"),
              ),
              SizedBox(height: 10),
              ElevatedButton(
                onPressed: () async {
                  // 将亮度设置为最小值
                  await setBrightness(0.0);
                },
                child: Text("设置最小亮度"),
              ),
              SizedBox(height: 10),
              ElevatedButton(
                onPressed: () async {
                  // 获取当前亮度并显示
                  final brightness = await Brightness().getBrightness();
                  setState(() {
                    currentBrightness = brightness;
                  });
                },
                child: Text("刷新亮度"),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

更多关于Flutter屏幕亮度控制插件brightness的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter屏幕亮度控制插件brightness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中，如果你想控制设备的屏幕亮度，可以使用brightness插件。这个插件允许你获取和设置设备的屏幕亮度。以下是如何使用brightness插件的步骤：

1. 添加依赖

首先，你需要在pubspec.yaml文件中添加brightness插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  brightness: ^0.4.0

然后运行flutter pub get来安装依赖。

2. 导入插件

在你的Dart文件中导入brightness插件：

import 'package:brightness/brightness.dart';

3. 获取当前屏幕亮度

你可以使用Brightness类的current方法来获取当前的屏幕亮度。亮度值是一个double类型，范围从0.0（最暗）到1.0（最亮）。

Future<double> getCurrentBrightness() async {
  try {
    double brightness = await Brightness().current;
    return brightness;
  } catch (e) {
    print("Failed to get brightness: $e");
    return 0.0;
  }
}

4. 设置屏幕亮度

你可以使用Brightness类的setBrightness方法来设置屏幕亮度。传入一个double类型的值，范围从0.0到1.0。

Future<void> setBrightness(double brightness) async {
  try {
    await Brightness().setBrightness(brightness);
  } catch (e) {
    print("Failed to set brightness: $e");
  }
}

5. 重置屏幕亮度

如果你想将屏幕亮度重置为系统默认值，可以使用resetBrightness方法。

Future<void> resetBrightness() async {
  try {
    await Brightness().resetBrightness();
  } catch (e) {
    print("Failed to reset brightness: $e");
  }
}

6. 示例代码

以下是一个完整的示例，展示了如何获取、设置和重置屏幕亮度：

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

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: BrightnessControlScreen(),
    );
  }
}

class BrightnessControlScreen extends StatefulWidget {
  [@override](/user/override)
  _BrightnessControlScreenState createState() => _BrightnessControlScreenState();
}

class _BrightnessControlScreenState extends State<BrightnessControlScreen> {
  double _currentBrightness = 0.5;

  [@override](/user/override)
  void initState() {
    super.initState();
    _getCurrentBrightness();
  }

  Future<void> _getCurrentBrightness() async {
    double brightness = await Brightness().current;
    setState(() {
      _currentBrightness = brightness;
    });
  }

  Future<void> _setBrightness(double brightness) async {
    await Brightness().setBrightness(brightness);
    _getCurrentBrightness();
  }

  Future<void> _resetBrightness() async {
    await Brightness().resetBrightness();
    _getCurrentBrightness();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Brightness Control'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('Current Brightness: ${_currentBrightness.toStringAsFixed(2)}'),
            Slider(
              value: _currentBrightness,
              onChanged: (value) {
                _setBrightness(value);
              },
            ),
            ElevatedButton(
              onPressed: _resetBrightness,
              child: Text('Reset Brightness'),
            ),
          ],
        ),
      ),
    );
  }
}
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