Flutter平台对象通信插件platform_object_channel_foundation的使用

Flutter平台对象通信插件platform_object_channel_foundation的使用

该插件是macOS和iOS平台上platform_object_channel的实现。

使用方法

此包是被推荐使用的,这意味着您可以直接使用platform_object_channel。当您这样做时,此包将自动包含在您的应用中,因此您无需将其添加到pubspec.yaml文件中。

然而,如果您导入此包以直接使用其API,则应像往常一样将其添加到pubspec.yaml文件中。

示例代码

以下是一个完整的示例代码,展示了如何在Flutter应用中使用platform_object_channel_foundation插件。

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:platform_object_channel_foundation/platform_object_channel_foundation.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> {
  // 用于存储方法调用结果
  dynamic _methodResult = 'Unknown';
  // 用于存储流式方法调用结果
  dynamic _streamMethodResult = 'Unknown';

  // 创建平台对象通道实例
  final _platformObjectInstanceFoundationPlugin = PlatformObjectChannelFoundation();

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

    // 创建平台对象通道
    var object = _platformObjectInstanceFoundationPlugin.createPlatformObjectChannel("TestObject", "TestObject");

    // 设置平台对象方法调用处理器
    object.setPlatformObjectMethodCallHandler(
      (method, arguments) async {
        print("来自平台: $method $arguments");
        return "im flutter";
      },
    );

    // 调用方法并获取结果
    Future(() async {
      _methodResult = await object.invokeMethod("method");
    });

    // 监听流式方法调用结果
    Future(() async {
      await for (var element in object.invokeMethodStream("method")) {
        setState(() {
          _streamMethodResult = element;
        });
      }
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('插件示例应用'),
        ),
        body: Column(
          children: [
            // 显示方法调用结果
            Text("方法结果: $_methodResult"),
            // 显示流式方法调用结果
            Text("流式方法结果: $_streamMethodResult"),
          ],
        ),
      ),
    );
  }
}

代码解释

  1. 导入必要的库:

    import 'package:flutter/material.dart';
    import 'dart:async';
    import 'package:platform_object_channel_foundation/platform_object_channel_foundation.dart';
    
  2. 创建应用主入口点:

    void main() {
      runApp(const MyApp());
    }
    
  3. 定义MyApp状态类:

    class MyApp extends StatefulWidget {
      const MyApp({super.key});
    
      [@override](/user/override)
      State<MyApp> createState() => _MyAppState();
    }
    
  4. 初始化状态并设置平台对象通道:

    class _MyAppState extends State<MyApp> {
      dynamic _methodResult = 'Unknown';
      dynamic _streamMethodResult = 'Unknown';
      final _platformObjectInstanceFoundationPlugin = PlatformObjectChannelFoundation();
    
      [@override](/user/override)
      void initState() {
        super.initState();
    
        var object = _platformObjectInstanceFoundationPlugin.createPlatformObjectChannel("TestObject", "TestObject");
        object.setPlatformObjectMethodCallHandler(
          (method, arguments) async {
            print("来自平台: $method $arguments");
            return "im flutter";
          },
        );
    
        Future(() async {
          _methodResult = await object.invokeMethod("method");
        });
    
        Future(() async {
          await for (var element in object.invokeMethodStream("method")) {
            setState(() {
              _streamMethodResult = element;
            });
          }
        });
      }
    
  5. 构建UI:

    [@override](/user/override)
    Widget build(BuildContext context) {
      return MaterialApp(
        home: Scaffold(
          appBar: AppBar(
            title: const Text('插件示例应用'),
          ),
          body: Column(
            children: [
              Text("方法结果: $_methodResult"),
              Text("流式方法结果: $_streamMethodResult"),
            ],
          ),
        ),
      );
    }
    

更多关于Flutter平台对象通信插件platform_object_channel_foundation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平台对象通信插件platform_object_channel_foundation的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


platform_object_channel_foundation 是一个 Flutter 插件,用于在 Flutter 和原生平台(如 Android 和 iOS)之间进行对象级别的通信。它提供了一个更强大的机制来传递复杂的对象,而不仅仅是简单的数据类型(如字符串或整数)。

1. 安装插件

首先,你需要在 pubspec.yaml 文件中添加 platform_object_channel_foundation 插件依赖:

dependencies:
  flutter:
    sdk: flutter
  platform_object_channel_foundation: ^1.0.0

然后运行 flutter pub get 来安装插件。

2. 基本用法

2.1 在 Dart 端

在 Dart 端,你可以使用 PlatformObjectChannel 来与原生平台进行通信。以下是一个简单的例子:

import 'package:platform_object_channel_foundation/platform_object_channel_foundation.dart';

void main() {
  final channel = PlatformObjectChannel('com.example.my_app/channel_name');

  // 发送消息到原生平台
  channel.sendMessage({
    'command': 'greet',
    'name': 'Flutter',
  }).then((response) {
    print('Received response: $response');
  });

  // 监听来自原生平台的消息
  channel.setMessageHandler((message) {
    print('Received message from platform: $message');
    return Future.value({'response': 'Hello from Flutter!'});
  });
}

2.2 在 Android 端

在 Android 端,你需要创建一个 PlatformObjectChannel 的实例,并设置消息处理程序。以下是一个简单的例子:

import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.PluginRegistry.Registrar;
import io.flutter.plugin.common.PlatformObjectChannel;

public class MainActivity extends FlutterActivity {
    private static final String CHANNEL = "com.example.my_app/channel_name";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        new PlatformObjectChannel(getFlutterView(), CHANNEL).setMethodCallHandler(
            new PlatformObjectChannel.MethodCallHandler() {
                @Override
                public void onMethodCall(MethodCall call, PlatformObjectChannel.Result result) {
                    if (call.method.equals("greet")) {
                        String name = call.argument("name");
                        result.success("Hello, " + name + " from Android!");
                    } else {
                        result.notImplemented();
                    }
                }
            }
        );
    }
}

2.3 在 iOS 端

在 iOS 端,你可以使用 FlutterMethodChannel 来实现类似的功能。以下是一个简单的例子:

#import <Flutter/Flutter.h>

[@interface](/user/interface) AppDelegate : FlutterAppDelegate

[@end](/user/end)

[@implementation](/user/implementation) AppDelegate

- (BOOL)application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    FlutterViewController* controller = (FlutterViewController*)self.window.rootViewController;

    FlutterMethodChannel* channel = [FlutterMethodChannel
        methodChannelWithName:@"com.example.my_app/channel_name"
              binaryMessenger:controller];

    [channel setMethodCallHandler:^(FlutterMethodCall* call, FlutterResult result) {
        if ([call.method isEqualToString:@"greet"]) {
            NSString* name = call.arguments[@"name"];
            result([NSString stringWithFormat:@"Hello, %@ from iOS!", name]);
        } else {
            result(FlutterMethodNotImplemented);
        }
    }];

    return [super application:application didFinishLaunchingWithOptions:launchOptions];
}

[@end](/user/end)
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