Flutter作为一套比较成熟的ui系统,基础能完成原生能做的ui,但是毕竟不能直接调用系统,比说相机,位置,地图之类的,所以这时候就要进行Flutter与原生的调用,由于本人安卓开发过来的,不会ios,所以这里只能介绍flutter开发Android的交互
效果图:
通道Platform Channel
首先在原生层android/app的目录下建立原生层的类
1,MyCustomViewView 实现PlatformView接口创建原生视图,通实MethodChannel
接口实现对flutter传过来的数据监听。
package com.zhang.flutter_jianshu2;
import android.content.Context;
import android.view.View;
import android.widget.TextView;
import java.util.Map;
import io.flutter.plugin.common.BinaryMessenger;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.platform.PlatformView;
public class MyCustomViewView implements PlatformView, MethodChannel.MethodCallHandler {
private TextView myNativeView;
MyCustomViewView(Context context, BinaryMessenger messenger, int id, Map<String, Object> params) {
myNativeView = new TextView(context);
myNativeView.setText("我是来自Android的原生TextView");
this.myNativeView = myNativeView;
if (params.containsKey("myContent")) {
String myContent = (String) params.get("myContent");
myNativeView.setText(myContent);
}
MethodChannel methodChannel = new MethodChannel(messenger, "suibianzifuchuan_" + id);
methodChannel.setMethodCallHandler(this);
}
@Override
public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {
if ("setText".equals(methodCall.method)) {
String text = (String) methodCall.arguments;
myNativeView.setText(text);
result.success(null);
}
}
@Override
public View getView() {
return myNativeView;
}
@Override
public void dispose() {
}
}
2,CustomViewRegistrant 用于在原生的监听注册,这里注册时要注意通道值要和flutter的一致,确保在同一条通道上才可以交互。
public class CustomViewRegistrant {
private static final String TAG = CustomViewRegistrant.class.getName();
public static void registerWith(PluginRegistry registry) {
final String key = CustomViewRegistrant.class.getCanonicalName();
Log.i(TAG,"registerKey="+key);
if (registry.hasPlugin(key)) {
return;
}
PluginRegistry.Registrar registrar = registry.registrarFor(key);
registrar.platformViewRegistry().registerViewFactory("suibianzifuchuan_", new MyViewFactory(registrar.messenger()));
}
}
在MainActivity中进行注册
class MainActivity: FlutterActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
GeneratedPluginRegistrant.registerWith(this)
CustomViewRegistrant.registerWith(this)//注册
}
}
4,flutter这边的调用
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
class PlatChannel extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return PlatChannelState();
}
}
class PlatChannelState extends State<PlatChannel> {
//2.编写页面
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Flutter与原生界面交互"),
),
body: Center(
child: AndroidView(
viewType: 'suibianzifuchuan_',
creationParams: {
"myContent": "通过参数传入的文本内容",
},
creationParamsCodec: const StandardMessageCodec(),
onPlatformViewCreated: onMyViewCreated,
),
),
);
}
MethodChannel _channel;
void onMyViewCreated(int id) {
_channel = new MethodChannel('suibianzifuchuan_$id');
setText("哈哈哈adf");
}
Future<void> setText(String text) async {
assert(text != null);
return _channel.invokeMethod('setText', text);
}
}
好了,在取得代码运行成功之后,不妨再深刻理解这个通讯机制,Platform Channel主要分三种:
(1)BasicMeaaspeChannel :大内存数据块传递的情况使用
(2)MethodChannel:传递方法的调用,通常情况下用
(3)EventChannel:数据流的通讯
这三种通讯在不同情况下使用,但是共同点都是通过BinaryMesage作为通讯工具。
注意事项
1,进行通道测试时,热重载是无效的
2,尽量避免对原生层的过多调用,流畅性并不是很多
3,debug模式跳转flutter调用原生页面时会出现白屏闪动的情况,但是release模式就不会。
好了,附上源码:
参考文章:
https://blog.csdn.net/zhutao_java/article/details/89916862