鸿蒙harmonyos next flutter混合开发之开发plugin（获取操作系统版本号）

• 创建Plugin为my_plugin

flutter create --org com.example --template=plugin --platforms=android,ios,ohos my_plugin

• 创建Application为my_application

flutter create --org com.example my_application

• flutter_application引用flutter_plugin，在pubspec.yaml文件中dependencies中添加flutter_plugin引用

  my_plugin:path: /Users/administrator/Desktop/workspace/my_plugin

• 代码编写调用

my_plugin ohos代码编写：

import {FlutterPlugin,FlutterPluginBinding,MethodCall,MethodCallHandler,MethodChannel,MethodResult,
} from '@ohos/flutter_ohos';
import deviceInfo from '@ohos.deviceInfo'/** MyPlugin **/
export default class MyPlugin implements FlutterPlugin, MethodCallHandler {private channel: MethodChannel | null = null;constructor() {}getUniqueClassName(): string {return "MyPlugin"}onAttachedToEngine(binding: FlutterPluginBinding): void {this.channel = new MethodChannel(binding.getBinaryMessenger(), "my_plugin");this.channel.setMethodCallHandler(this)}onDetachedFromEngine(binding: FlutterPluginBinding): void {if (this.channel != null) {this.channel.setMethodCallHandler(null)}}onMethodCall(call: MethodCall, result: MethodResult): void {if (call.method == "getPlatformVersion") {result.success(deviceInfo.osFullName);} else {result.notImplemented()}}
}

my_plugin dart代码编写：

import 'my_plugin_platform_interface.dart';class MyPlugin {Future<String?> getPlatformVersion() {return MyPluginPlatform.instance.getPlatformVersion();}
}

import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';import 'my_plugin_platform_interface.dart';/// An implementation of [MyPluginPlatform] that uses method channels.
class MethodChannelMyPlugin extends MyPluginPlatform {/// The method channel used to interact with the native platform.@visibleForTestingfinal methodChannel = const MethodChannel('my_plugin');@overrideFuture<String?> getPlatformVersion() async {final version = await methodChannel.invokeMethod<String>('getPlatformVersion');return version;}
}

import 'package:plugin_platform_interface/plugin_platform_interface.dart';import 'my_plugin_method_channel.dart';abstract class MyPluginPlatform extends PlatformInterface {/// Constructs a MyPluginPlatform.MyPluginPlatform() : super(token: _token);static final Object _token = Object();static MyPluginPlatform _instance = MethodChannelMyPlugin();/// The default instance of [MyPluginPlatform] to use.////// Defaults to [MethodChannelMyPlugin].static MyPluginPlatform get instance => _instance;/// Platform-specific implementations should set this with their own/// platform-specific class that extends [MyPluginPlatform] when/// they register themselves.static set instance(MyPluginPlatform instance) {PlatformInterface.verifyToken(instance, _token);_instance = instance;}Future<String?> getPlatformVersion() {throw UnimplementedError('platformVersion() has not been implemented.');}
}

my_application dart代码调用：

import 'package:flutter/material.dart';
import 'package:my_plugin/my_plugin.dart';void main() {runApp(const MyApp());
}class MyApp extends StatelessWidget {const MyApp({super.key});@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Flutter Demo',theme: ThemeData(primarySwatch: Colors.blue,),home: const MyHomePage(title: 'my_application调用my_plugin'),);}
}class MyHomePage extends StatefulWidget {const MyHomePage({super.key, required this.title});final String title;@overrideState<MyHomePage> createState() => _MyHomePageState();
}class _MyHomePageState extends State<MyHomePage> {MyPlugin myPlugin = MyPlugin();String PlatformVersion = "";@overridevoid initState() {// TODO: implement initStatesuper.initState();myPlugin.getPlatformVersion().then((value){PlatformVersion = value ?? "";setState(() {});});}@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text(widget.title),),body: Center(child: Column(mainAxisAlignment: MainAxisAlignment.center,crossAxisAlignment: CrossAxisAlignment.center,children: <Widget>[Text('当前平台版本号为：$PlatformVersion',style: Theme.of(context).textTheme.headlineMedium,textAlign: TextAlign.center,),],),),);}
}

• 效果展示