Flutter 混合開發系列 包含以下：android
嵌入原生View-Android 嵌入原生View-iOS 與原生通訊-MethodChannel 與原生通訊-BasicMessageChannel 與原生通訊-EventChannel 添加 Flutter 到 Android Activity 添加 Flutter 到 Android Fragment 添加 Flutter 到 iOS 每一個工做日分享一篇，歡迎關注、點贊及轉發。ios
EventChannel
Flutter 端
Flutter 端建立 EventChannel 通道，用於與原生端通訊：web
var _eventChannel = EventChannel('com.flutter.guide.EventChannel');
com.flutter.guide.EventChannel 是 EventChannel 的名稱，原生端要與之對應。api
監聽原生端發送的消息：微信
var _data;
@override
void initState() {
super.initState();
_eventChannel.receiveBroadcastStream().listen(_onData);
}
_onData(event){
setState(() {
_data = event;
});
}
Flutter 端完整代碼：app
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('$_data'),
),
);
}
}
Android 端
android 下建立 EventChannelDemo：編輯器
class EventChannelDemo(var activity: Activity, messenger: BinaryMessenger):EventChannel.StreamHandler {
private var channel: EventChannel
private var index = 0
private var events: EventChannel.EventSink? = null
init {
channel = EventChannel(messenger, "com.flutter.guide.EventChannel")
channel.setStreamHandler(this)
startTimer()
}
fun startTimer() {
var timer = Timer().schedule(timerTask {
index++
var map = mapOf("name" to "laomeng${index}",
"age" to "${index}"
)
activity.runOnUiThread {
events?.success(map)
}
}, 0, 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 端發送數據，此方法必須在主線程執行：ide
activity.runOnUiThread {
events?.success(map)
}
在 MainActivity 啓動：flex
class MainActivity : FlutterActivity() {
override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
super.configureFlutterEngine(flutterEngine)
EventChannelDemo(this,flutterEngine.dartExecutor.binaryMessenger)
flutterEngine.plugins.add(MyPlugin())
}
}
iOS 端
ios 下建立 MethodChannelDemo，按以下方式：ui
import Flutter
import UIKit
public 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 啓動：
import UIKit
import 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)
}
}
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