Flutter屏幕信息获取插件mobile_screen_info的使用

mobile_screen_info

A plugin to get screen information of mobile devices.

开始使用

pubspec.yaml 文件中添加此依赖:

dependencies:
  mobile_screen_info: ^1.0.0

然后运行 flutter pub get 来安装该插件。

使用方法

首先,导入必要的包并初始化插件:

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

import 'package:flutter/services.dart';
import 'package:mobile_screen_info/mobile_screen_info.dart';

接下来,在 initState 方法中通过异步调用获取屏幕信息:

class _MyAppState extends State<MyApp> {
  ScreenInfo? _screenInfo;
  final _mobileScreenInfoPlugin = MobileScreenInfo();

  @override
  void initState() {
    super.initState();
    initPlatformState();
  }

  // 异步方法用于获取屏幕信息
  Future<void> initPlatformState() async {
    ScreenInfo? screenInfo;

    // 可能会抛出平台异常,因此使用 try/catch 块处理
    try {
      screenInfo = await _mobileScreenInfoPlugin.getScreenInfo();
    } on PlatformException {}

    // 如果小部件从树中移除,则丢弃回复
    if (!mounted) return;

    // 更新 UI 状态
    setState(() {
      _screenInfo = screenInfo;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('移动设备屏幕信息'),
        ),
        body: Center(
          child: Column(
            children: [
              // 显示屏幕的 PPI
              Text('PPI: ${_screenInfo?.ppi ?? '未知'}'),
              // 显示屏幕缩放比例
              Text('Scale: ${_screenInfo?.scale ?? '未知'}'),
              // 显示屏幕宽度(像素)
              Text('Width: ${_screenInfo?.width ?? '未知'}'),
              // 显示屏幕高度(像素)
              Text('Height: ${_screenInfo?.height ?? '未知'}'),
              // 显示屏幕宽度(厘米)
              Text('Width in CM: ${_screenInfo?.widthInCm ?? '未知'}'),
              // 显示屏幕高度(厘米)
              Text('Height in CM: ${_screenInfo?.heightInCm ?? '未知'}'),
              // 显示屏幕宽度(英寸)
              Text('Width in Inch: ${_screenInfo?.widthInInch ?? '未知'}'),
              // 显示屏幕高度(英寸)
              Text('Height in Inch: ${_screenInfo?.heightInInch ?? '未知'}'),
            ],
          ),
        ),
      ),
    );
  }
}

完整示例代码

以下是完整的示例代码,展示了如何使用 mobile_screen_info 插件来获取屏幕信息:

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

import 'package:flutter/services.dart';
import 'package:mobile_screen_info/mobile_screen_info.dart';

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

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  ScreenInfo? _screenInfo;
  final _mobileScreenInfoPlugin = MobileScreenInfo();

  @override
  void initState() {
    super.initState();
    initPlatformState();
  }

  // 平台消息是异步的,因此我们在此处进行初始化
  Future<void> initPlatformState() async {
    ScreenInfo? screenInfo;

    // 平台消息可能会失败,因此我们使用 try/catch 块处理 PlatformException
    try {
      screenInfo = await _mobileScreenInfoPlugin.getScreenInfo();
    } on PlatformException {}

    // 如果小部件从树中移除,则丢弃回复
    if (!mounted) return;

    // 更新 UI 状态
    setState(() {
      _screenInfo = screenInfo;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('移动设备屏幕信息'),
        ),
        body: Center(
          child: Column(
            children: [
              Text('PPI: ${_screenInfo?.ppi ?? '未知'}'),
              Text('Scale: ${_screenInfo?.scale ?? '未知'}'),
              Text('Width: ${_screenInfo?.width ?? '未知'}'),
              Text('Height: ${_screenInfo?.height ?? '未知'}'),
              Text('Width in CM: ${_screenInfo?.widthInCm ?? '未知'}'),
              Text('Height in CM: ${_screenInfo?.heightInCm ?? '未知'}'),
              Text('Width in Inch: ${_screenInfo?.widthInInch ?? '未知'}'),
              Text('Height in Inch: ${_screenInfo?.heightInInch ?? '未知'}'),
            ],
          ),
        ),
      ),
    );
  }
}

输出结果

运行上述代码后,您将在屏幕上看到类似以下的输出:

PPI: 240
Scale: 2.0
Width: 1080
Height: 2400
Width in CM: 16.9
Height in CM: 38.0
Width in Inch: 6.7
Height in Inch: 15.0

更多关于Flutter屏幕信息获取插件mobile_screen_info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屏幕信息获取插件mobile_screen_info的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


mobile_screen_info 是一个用于获取移动设备屏幕信息的 Flutter 插件。它可以帮助你获取诸如屏幕宽度、高度、像素密度、屏幕方向等信息。以下是如何使用 mobile_screen_info 插件的详细步骤。

1. 添加依赖

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

dependencies:
  flutter:
    sdk: flutter
  mobile_screen_info: ^1.0.0  # 请使用最新版本

然后运行 flutter pub get 来获取依赖。

2. 导入插件

在你的 Dart 文件中导入 mobile_screen_info 插件。

import 'package:mobile_screen_info/mobile_screen_info.dart';

3. 获取屏幕信息

使用 MobileScreenInfo 类来获取屏幕信息。你可以通过调用 MobileScreenInfo.instance 来获取屏幕信息。

void getScreenInfo() async {
  MobileScreenInfo screenInfo = MobileScreenInfo.instance;

  double screenWidth = screenInfo.screenWidth;
  double screenHeight = screenInfo.screenHeight;
  double pixelRatio = screenInfo.pixelRatio;
  Orientation orientation = screenInfo.orientation;

  print('Screen Width: $screenWidth');
  print('Screen Height: $screenHeight');
  print('Pixel Ratio: $pixelRatio');
  print('Orientation: $orientation');
}

4. 监听屏幕方向变化

你还可以监听屏幕方向的变化。MobileScreenInfo 提供了一个 onOrientationChanged 流来监听屏幕方向的变化。

void listenToOrientationChanges() {
  MobileScreenInfo screenInfo = MobileScreenInfo.instance;

  screenInfo.onOrientationChanged.listen((Orientation orientation) {
    print('Orientation changed to: $orientation');
  });
}

5. 完整示例

以下是一个完整的示例,展示如何使用 mobile_screen_info 插件获取屏幕信息并监听屏幕方向的变化。

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

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

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

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

class _ScreenInfoPageState extends State<ScreenInfoPage> {
  double screenWidth = 0;
  double screenHeight = 0;
  double pixelRatio = 0;
  Orientation orientation = Orientation.portrait;

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

  void getScreenInfo() async {
    MobileScreenInfo screenInfo = MobileScreenInfo.instance;

    setState(() {
      screenWidth = screenInfo.screenWidth;
      screenHeight = screenInfo.screenHeight;
      pixelRatio = screenInfo.pixelRatio;
      orientation = screenInfo.orientation;
    });
  }

  void listenToOrientationChanges() {
    MobileScreenInfo screenInfo = MobileScreenInfo.instance;

    screenInfo.onOrientationChanged.listen((Orientation newOrientation) {
      setState(() {
        orientation = newOrientation;
      });
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Screen Info'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('Screen Width: $screenWidth'),
            Text('Screen Height: $screenHeight'),
            Text('Pixel Ratio: $pixelRatio'),
            Text('Orientation: $orientation'),
          ],
        ),
      ),
    );
  }
}
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