【Flutter 混合开发】与原生通信-EventChannel

概述Flutter 混合开发系列 包含如下： 嵌入原生View-Android 嵌入原生View-iOS 与原生通信-MethodChannel 与原生通信-BasicMessageChannel 与原生

Flutter 混合开发系列 包含如下：

嵌入原生VIEw-AndroID嵌入原生VIEw-iOS与原生通信-MethodChannel与原生通信-BasicmessageChannel与原生通信-EventChannel添加 Flutter 到 AndroID Activity添加 Flutter 到 AndroID Fragment添加 Flutter 到 iOS

每个工作日分享一篇，欢迎关注、点赞及转发。

EventChannelFlutter 端

Flutter 端创建 EventChannel 通道，用于与原生端通信：

var _eventChannel = EventChannel('com.Flutter.guIDe.EventChannel');

com.Flutter.guIDe.EventChannel 是 EventChannel 的名称，原生端要与之对应。

监听原生端发送的消息：

var _data;  @overrIDe  voID initState() {    super.initState();    _eventChannel.receivebroadcastStream().Listen(_onData);  }  _onData(event){    setState(() {      _data = event;    });  }

Flutter 端完整代码：

class EventChannelDemo extends StatefulWidget {  @overrIDe  _EventChannelDemoState createState() => _EventChannelDemoState();}class _EventChannelDemoState extends State<EventChannelDemo> {  var _eventChannel = EventChannel('com.Flutter.guIDe.EventChannel');  var _data;  @overrIDe  voID initState() {    super.initState();    _eventChannel.receivebroadcastStream().Listen(_onData);  }  _onData(event){    setState(() {      _data = event;    });  }  @overrIDe  Widget build(BuildContext context) {    return Scaffold(      appbar: Appbar(),body: Center(        child: Text('$_data'),),);  }}

AndroID 端

androID 下创建 EventChannelDemo：

class EventChannelDemo(var activity: Activity,messenger: BinaryMessenger):EventChannel.StreamHandler {    private var channel: EventChannel    private var index = 0    private var events: EventChannel.EventSink? = null    init {        channel = EventChannel(messenger,"com.Flutter.guIDe.EventChannel")        channel.setStreamHandler(this)        startTimer()    }    fun startTimer() {        var timer = Timer().schedule(timerTask {            index++            var map = mapOf("name" to "laomeng${index}","age" to "${index}"            )            activity.runOnUiThread {                events?.success(map)            }        },1000)    }    overrIDe fun onListen(arguments: Any?,events: EventChannel.EventSink?) {        this.events = events    }    overrIDe fun onCancel(arguments: Any?) {        this.events = null    }}

events?.success(map) 方法是向 Flutter 端发送数据，此方法必须在主线程执行：

activity.runOnUiThread {	events?.success(map)}

在 MainActivity 启动：

class MainActivity : FlutterActivity() {    overrIDe fun configureFlutterEngine(FlutterEngine: FlutterEngine) {        super.configureFlutterEngine(FlutterEngine)        EventChannelDemo(this,FlutterEngine.dartExecutor.binaryMessenger)        FlutterEngine.plugins.add(MyPlugin())    }}

iOS 端

ios 下创建 MethodChannelDemo，按如下方式：

import Flutterimport UIKitpublic class EventChannelDemo:NSObject,FlutterStreamHandler{        var channel:FlutterEventChannel?    var count =  0    var events:FlutterEventSink?        public overrIDe init() {        super.init()    }        convenIEnce init(messenger: FlutterBinaryMessenger) {                self.init()                channel = FlutterEventChannel(name: "com.Flutter.guIDe.EventChannel",binaryMessenger: messenger)        channel?.setStreamHandler(self)        startTimer()    }        func startTimer() {        let timer = Timer.scheduledTimer(timeInterval:1,target: self,selector:#selector(self.tickDown),userInfo:nil,repeats: true)    }    @objc func tickDown(){        count += 1        let args = ["count":count]        if(events != nil){            events!(args)        }    }        public func onListen(withArguments arguments: Any?,eventSink events: @escaPing FlutterEventSink) -> FlutterError? {        self.events = events        return nil;    }        public func onCancel(withArguments arguments: Any?) -> FlutterError? {        self.events = nil        return nil;    }}

在 AppDelegate 启动：

import UIKitimport Flutter@UIApplicationMain@objc class AppDelegate: FlutterAppDelegate {  overrIDe func application(    _ application: UIApplication,dIDFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?  ) -> Bool {        let controller : FlutterVIEwController = window?.rootVIEwController as! FlutterVIEwController    EventChannelDemo(messenger: controller.binaryMessenger)    GeneratedpluginRegistrant.register(with: self)        return super.application(application,dIDFinishLaunchingWithOptions: launchOptions)  }}

交流

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