大佬教程收集整理的这篇文章主要介绍了【Flutter 混合开发】与原生通信-MethodChannel，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
此图为官方的架构图
Flutter 与 Native 端通信是异步的。
Native 端主动发送数据给 Flutter时，Native 端代码需要在主线程中执行，Android 端从子线程跳转到主线程方式：
Kotlin 代码：
Handler(Looper.getMainLooper()).post {
}
Java 代码：
new Handler(Looper.getMainLooper()).post(new Runnable() {
@Override
public void run() {
}
});
如果可以获取到当前 Activity，也可以使用如下方式：
activity.runOnUiThread {
}
iOS 端从子线程跳转到主线程方式：
dispatch_async(dispatch_get_main_queue(),^{
});
Swift 代码：
DispatchQueue.main.async {
}
Flutter 端创建 @H_738_13@methodChAnnel 通道，用于与原生端通信：
var chAnnel = MethodChAnnel('com.Flutter.guide.MethodChAnnel');
com.Flutter.guide.MethodChAnnel 是 MethodChAnnel 的名称，原生端要与之对应。
发送消息：
var result = await chAnnel.invokeMethod('sendData',{'name': 'laomeng','age': 18})
完整代码：
class MethodChAnnelDemo extends StatefulWidget {
@override
_MethodChAnnelDemoState createState() => _MethodChAnnelDemoState();
}
class _MethodChAnnelDemoState extends State<MethodChAnnelDemo> {
var chAnnel = MethodChAnnel('com.Flutter.guide.MethodChAnnel');
var _data;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),body: column(
children: [
SizedBox(
height: 50,),RaisedButton(
child: Text('发送数据到原生'),onPressed: () async {
var result = await chAnnel
.invokeMethod('sendData','age': 18});
var name = result['name'];
var age = result['age'];
setState(() {
_data = '$name,$age';
});
},Text('原生返回数据：$_data')
],);
}
}
android 下创建 @H_738_13@methodChAnnelDemo：
package com.Flutter.guide
import io.Flutter.plugin.common.binarymessenger
import io.Flutter.plugin.common.MethodCall
import io.Flutter.plugin.common.MethodChAnnel
/**
* des:
*/
class MethodChAnnelDemo(messenger: Binarymessenger): MethodChAnnel.MethodCallHandler {
private var chAnnel: MethodChAnnel
init {
chAnnel = MethodChAnnel(messenger,"com.Flutter.guide.MethodChAnnel")
chAnnel.setMethodCallHandler(this)
}
override fun onMethodCall(call: MethodCall,result: MethodChAnnel.Result) {
}
}
onMethodCall 方法在 Flutter 端调用 invokeMethod 方法回调，解析方法如下：
override fun onMethodCall(call: MethodCall,result: MethodChAnnel.Result) {
if (call.method == "sendData") {
val name = call.argument("name") as String?
val age = call.argument("age") as Int?
var map = mapOf("name" to "Hello,$name","age" to "$age"
)
result.success(map)
}
}
Flutter 端解析：
var result = await chAnnel
.invokeMethod('sendData','age': 18});
var name = result['name'];
var age = result['age'];
在 @H_738_13@mainActivity 启动：
class MainActivity : FlutterActivity() {
override fun configureFlutterENGIne(FlutterENGIne: FlutterENGInE) {
super.configureFlutterENGIne(FlutterENGInE)
MethodChAnnelDemo(FlutterENGIne.dartExecutor.binarymessenger)
}
}
ios 下创建 @H_738_13@methodChAnnelDemo，按如下方式：
import Flutter
import UIKit
public class MethodChAnnelDemo {
init(messenger: FlutterBinarymessenger) {
let chAnnel = FlutterMethodChAnnel(name: "com.Flutter.guide.MethodChAnnel",binarymessenger: messenger)
chAnnel.setMethodCallHandler { (call:FlutterMethodCall,result:@escaping FlutterResult) in
if (call.method == "sendData") {
if let Dict = call.arguments as? Dictionary<String,Any> {
let name:string = Dict["name"] as? String ?? ""
let age:Int = Dict["age"] as? Int ?? -1
result(["name":"Hello,\(Name)","age":age])
}
}
}
}
}
在 AppDelegate 启动：
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
MethodChAnnelDemo(messenger: controller.binarymessenger)
GeneratedPluginRegistrant.register(with: self)
return super.application(application,didFinishLaunchingWithOptions: launchOptions)
}
}
@override
void initState() {
super.initState();
chAnnel.setMethodCallHandler((call) {
setState(() {
_nativeData = call.arguments['count'];
});
});
}
原生端启动定时器，每隔一秒向 Flutter 发送数据，Android 端代码：
class MethodChAnnelDemo(var activity: Activity,messenger: Binarymessenger) : MethodChAnnel.MethodCallHandler {
private var chAnnel: MethodChAnnel
private var count = 0
init {
chAnnel = MethodChAnnel(messenger,"com.Flutter.guide.MethodChAnnel")
chAnnel.setMethodCallHandler(this)
startTimer()
}
fun startTimer() {
var timer = Timer().schedule(timerTask {
activity.runOnUiThread {
var map = mapOf("count" to count++)
chAnnel.invokeMethod("timer",map)
}
},1000)
}
override fun onMethodCall(call: MethodCall,result: MethodChAnnel.Result) {
if (call.method == "sendData") {
val name = call.argument("name") as String?
val age = call.argument("age") as Int?
var map = mapOf("name" to "Hello,"age" to "$age"
)
result.success(map)
}
}
}
启动修改如下：
class MainActivity : FlutterActivity() {
override fun configureFlutterENGIne(FlutterENGIne: FlutterENGInE) {
super.configureFlutterENGIne(FlutterENGInE)
MethodChAnnelDemo(this,FlutterENGIne.dartExecutor.binarymessenger)
FlutterENGIne.plugins.add(MyPlugin())
}
}
iOS 端启动定时器代码如下：
import Flutter
import UIKit
public class MethodChAnnelDemo {
var count = 0
var chAnnel:FlutterMethodChAnnel
init(messenger: FlutterBinarymessenger) {
chAnnel = FlutterMethodChAnnel(name: "com.Flutter.guide.MethodChAnnel","age":age])
}
}
}
startTimer()
}
func startTimer() {
var timer = Timer.scheduledTimer(timeInterval:1,target: self,SELEctor:#SELEctor(self.tickDown),userInfo:nil,repeats: truE)
}
@objc func tickDown(){
count += 1
var args = ["count":count]
chAnnel.invokeMethod("timer",arguments:args)
}
}
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