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
在 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
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'),
],
),
),
);
}
}