鸿蒙Flutter实战：20. Flutter集成高德地图，同层渲染

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本文以同层渲染为例，介绍如何集成高德地图

完整代码见 Flutter 鸿蒙版 Demo

概述

Dart 侧

核心代码如下，通过 OhosView 来承载原生视图

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OhosView(
      viewType: 'com.shaohushuo.app/customView',
      onPlatformViewCreated: _onPlatformViewCreated,
      creationParams: const <String, dynamic>{'initParams': 'hello world'},
      creationParamsCodec: const StandardMessageCodec(),
    )

其中 viewType 为自定义的 ohosView 的名称，onPlatformViewCreated 为创建完成回调，creationParams 为创建时传入的参数，creationParamsCodec 为参数编码格式。

ArkTS 侧

这里面我们按照《如何使用PlatformView》中的示例操作，首先需要创建一个显示高德地图的视图，其核心代码如下：

完整文件 AmapWidgetFactory.ets

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MapsInitializer.setApiKey("e4147e927a1f63a0acff45cecf9419b5");
MapViewManager.getInstance().registerMapViewCreatedCallback((mapview?: MapView, mapViewName?: string) => {
  if (!mapview) {
    return;
  }
  let mapView = mapview;
  mapView.onCreate();
  mapView.getMapAsync((map) => {
    let aMap: AMap = map;
  })
})

@Component
struct ButtonComponent {
  @Prop params: Params
  customView: AmapWidgetView = this.params.platformView as AmapWidgetView

  build() {
    Row() {
      MapViewComponent().width('100%').height('100%')
    }
  }
}

接下来创建一个 AmapWidgetFactory.ets

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export class AmapWidgetFactory extends PlatformViewFactory {
  message: BinaryMessenger;

  constructor(message: BinaryMessenger, createArgsCodes: MessageCodec<Object>) {
    super(createArgsCodes);
    this.message = message;
  }

  public create(context: common.Context, viewId: number, args: Object): PlatformView {
    return new AmapWidgetView(context, viewId, args, this.message);
  }
}

最终需要创建一个 AmapWidgetPlugin.ets

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export class AmapWidgetPlugin implements FlutterPlugin {
  getUniqueClassName(): string {
    return 'AmapWidgetPlugin';
  }

  onAttachedToEngine(binding: FlutterPluginBinding): void {
    binding.getPlatformViewRegistry()?.
    registerViewFactory('com.shaohushuo.app/customView', new AmapWidgetFactory(binding.getBinaryMessenger(), StandardMessageCodec.INSTANCE));
  }

  onDetachedFromEngine(binding: FlutterPluginBinding): void {}
}

插件创建好之后，记得在 EntryAbility 中注册插件

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this.addPlugin(new AmapWidgetPlugin())

需要注意的是，视图ID一定要两侧保持一致，如这里名为 ‘com.shaohushuo.app/customView’，否则无法正常显示

截图

alt text

参考资料