如何构建一个Flutter应用程序来显示设备详细信息？

在这里，我们将使用flutter构建一个 android 应用程序，该应用程序显示它正在运行的设备信息。为了显示有关设备的信息，我们将使用一个名为device_info_plus的包。

创建Flutter项目：

现在删除所有现有代码并删除测试文件夹

创建一个基本的应用程序屏幕：

Dart

import 'package:flutter/material.dart';
  
void main() {
  runApp(DeviceInfo());
}
  
class DeviceInfo extends StatefulWidget {
  const DeviceInfo({Key? key}) : super(key: key);
  
  @override
  _DeviceInfoState createState() => _DeviceInfoState();
}
  
class _DeviceInfoState extends State {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
            title: Text('GeeksforGeeks'),
            backgroundColor: Colors.green,
        ),
        body: Container(),
      ),
    );
  }
}

将device_info_plus包添加到pubspec.yaml文件。

XML

name: deviceinfo
description: A Flutter app that displays device information
  
# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
  
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
  
environment:
  sdk: ">=2.12.0 <3.0.0"
  
dependencies:
  flutter:
    sdk: flutter
  device_info_plus: ^2.1.0
  
  
  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  
dev_dependencies:
  flutter_test:
    sdk: flutter
  
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
  
# The following section is specific to Flutter.
flutter:
  
  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true
  
  # To add assets to your application, add an assets section, like this:
  # assets:
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg
  
  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.
  
  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages
  
  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

实例化 DeviceInfoPlugin 并在 DeviceInfoState 类中创建 AndroidDeviceInfo 的 Future。

Dart

class _DeviceInfoState extends State {
  DeviceInfoPlugin _deviceInfoPlugin = DeviceInfoPlugin();
  late Future _androidDeviceInfo;
       
}

要检索 android 设备信息，我们需要获取未来，我们将在initState方法中执行该操作。这是一个覆盖方法，您可以通过在 android studio 中按 ctrl + O 来获取模板。

Dart

@override
 void initState() {
   _androidDeviceInfo = _deviceInfoPlugin.androidInfo;
   super.initState();
 }

要在未来解析后构建小部件，我们将在构建方法中使用 FutureBuilder 小部件

Dart

@override
Widget build(BuildContext context) {
  return MaterialApp(
      home: Scaffold(
    appBar: AppBar(
      title: Text('GeeksforGeeks'),
      backgroundColor: Colors.green,
    ),
    body: FutureBuilder(
      future: _androidDeviceInfo,
      builder: (context, snapshot) {
          
        // When future solves build text widget until then show indefinite progress
        if (snapshot.connectionState == ConnectionState.done) {
            
          // Retrieve AndroidDeviceInfo from future
          AndroidDeviceInfo _info = snapshot.data as AndroidDeviceInfo;
          return Center(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.center,
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Text(_info.manufacturer.toString()),
                Text(_info.model.toString()),
                Text("Android API Version ${_info.version.sdkInt}"),
              ],
            ),
          );
        } else {
          return Center(child: CircularProgressIndicator());
        }
      },
    ),
  ));
}

最后，你的主要。dart看起来像这样：

Dart

import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter/material.dart';
  
void main() {
  runApp(DeviceInfo());
}
  
class DeviceInfo extends StatefulWidget {
  const DeviceInfo({Key? key}) : super(key: key);
  
  @override
  _DeviceInfoState createState() => _DeviceInfoState();
}
  
class _DeviceInfoState extends State {
  DeviceInfoPlugin _deviceInfoPlugin = DeviceInfoPlugin();
  late Future _androidDeviceInfo;
  
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
      appBar: AppBar(
        title: Text('GeeksforGeeks'),
        backgroundColor: Colors.green,
      ),
      body: FutureBuilder(
        future: _androidDeviceInfo,
        builder: (context, snapshot) {
            
          // When future solves build text widget until
          // then show indefinite progress
          if (snapshot.connectionState == ConnectionState.done) {
              
            // Retrieve AndroidDeviceInfo from future
            AndroidDeviceInfo _info = snapshot.data as AndroidDeviceInfo;
            return Center(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.center,
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text(_info.manufacturer.toString()),
                  Text(_info.model.toString()),
                  Text("Android API Version ${_info.version.sdkInt}"),
                ],
              ),
            );
          } else {
            return Center(child: CircularProgressIndicator());
          }
        },
      ),
    ));
  }
  
  @override
  void initState() {
    _androidDeviceInfo = _deviceInfoPlugin.androidInfo;
    super.initState();
  }
}

现在按下android studio的运行按钮来安装应用程序