Flutter中的高德地图适配鸿蒙

众所周知，虽然Flutter 3.22版本编译到鸿蒙，已经没什么问题了。 但是，还是特别多的好用的Flutter插件未适配鸿蒙。

比如我们已经集成好的高德地图Flutter版的SDK， 并没有适配鸿蒙。 于是，只能自己动手术了。 

首先，Flutter版本的高德地图SDK如果你不想动它的话，直接去实现鸿蒙端的 Plugin 就可以了。 

第一步：创建 AMapFlutterMapPlugin ，注意名字什么的，和高德官方的Flutter SDK保持一样。 

import {
  Any,
  BasicMessageChannel, FlutterPlugin, FlutterPluginBinding,
  MethodCall,
  MethodChannel,
  MethodResult,
  StandardMessageCodec} from "@ohos/flutter_ohos";
import AMapPlatformViewFactory from "./AMapPlatformViewFactory";


export default class AMapFlutterMapPlugin implements FlutterPlugin {


  onDetachedFromEngine(binding: FlutterPluginBinding): void {
    this.channel?.setMethodCallHandler(null)
  }

  private channel?:MethodChannel;
  private basicChannel?: BasicMessageChannel;
  private VIEW_TYPE : string = "com.amap.flutter.map";

  getUniqueClassName(): string {
    return "AMapFlutterMapPlugin"
  }

  onAttachedToEngine(binding: FlutterPluginBinding): void {

    binding.getPlatformViewRegistry().registerViewFactory(this.VIEW_TYPE, new AMapPlatformViewFactory(binding.getBinaryMessenger(),StandardMessageCodec.INSTANCE))
 
    
  }

}

第二步：创建 AMapPlatformViewFactory ， 因为高德的地图只能是原生View显示，所以需要这个东西，把它显示到Flutter端。 这就需要这个工厂来支持一下
 

import { Any, BinaryMessenger, MessageCodec, PlatformView, PlatformViewFactory } from "@ohos/flutter_ohos";
import { common } from "@kit.AbilityKit";
import { AMapView } from "./AMapView";


export default class AMapPlatformViewFactory extends PlatformViewFactory {

  message: BinaryMessenger;

  constructor(message: BinaryMessenger, createArgsCodes: MessageCodec