Flutter屏幕亮度控制插件system_screen_brightness的使用

简介

system_screen_brightness 是一个用于控制屏幕亮度的插件。

开始使用

安装

在你的 pubspec.yaml 文件中添加以下依赖：

dependencies:
  system_screen_brightness: ^latest_version

然后运行 flutter pub get 来安装依赖。

API

获取当前系统亮度

Future<double> getCurrentBrightness() async {
  try {
    return await SystemScreenBrightness().currentBrightness;
  } catch (e) {
    print(e);
    throw 'Failed to get system current brightness';
  }
}

设置系统屏幕亮度

Future<void> setSystemScreenBrightness(double brightness) async {
  try {
    await SystemScreenBrightness.setSystemScreenBrightness(brightness);
  } catch (e) {
    print(e);
    throw 'Failed to set system screen brightness';
  }
}

完整示例代码

下面是一个完整的示例代码，展示了如何使用 system_screen_brightness 插件来控制屏幕亮度。

import 'dart:ui';

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

import 'package:flutter/services.dart';
import 'package:system_screen_brightness/system_screen_brightness.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> {
  double _brightness = 0.0;
  bool _isPermission = false;
  double _currentBrightness = 0.0;
  late final SystemScreenBrightness _systemScreenBrightnessPlugin = SystemScreenBrightness();

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

  initPlatformState() async {
    await initPlatformState1();
    await initPlatformState2();
  }

  // 平台消息是异步的，因此我们在异步方法中初始化。
  Future<void> initPlatformState1() async {
    double brightness;
    // 平台消息可能会失败，所以我们使用带有 PlatformException 的 try/catch。
    // 我们还处理消息可能返回 null 的情况。
    try {
      brightness = await _systemScreenBrightnessPlugin.currentBrightness;
    } on PlatformException {
      brightness = 0.0;
    }
    if (!mounted) return;

    setState(() {
      _currentBrightness = brightness;
    });
  }

  Future<bool?> initPlatformState2() async {
    bool hasPermission;
    try {
      hasPermission = await _systemScreenBrightnessPlugin.checkSystemWritePermission;
    } on PlatformException {
      hasPermission = false;
    }

    setState(() {
      _isPermission = hasPermission;
    });

    return hasPermission;
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('设置系统屏幕亮度应用'),
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Column(
              children: [
                Switch(
                  value: _isPermission,
                  onChanged: (value) async {
                    await _systemScreenBrightnessPlugin.openAndroidPermissionsMenu();
                    _isPermission = value;
                    setState(() {});
                  },
                ),
                Text(_isPermission.toString()),
                ElevatedButton(
                  onPressed: () async {
                    double brightness = await _systemScreenBrightnessPlugin.currentBrightness;
                    print(brightness);
                  },
                  child: Icon(Icons.power_settings_new),
                ),
                Text(_currentBrightness.toString())
              ],
            ),
            Column(
              children: [
                Slider(
                    value: _brightness,
                    min: 0.0,
                    max: 1.0,
                    onChanged: ((double value) {
                      _brightness = value;
                      _systemScreenBrightnessPlugin.setSystemScreenBrightness((value * 255).toInt());
                      setState(() {});
                    })
                ),
                Text(_brightness.toString()),
              ],
            )
          ],
        ),
      ),
    );
  }
}