HarmonyOS 华为地图全屏化

可参考以下demo：

import { MapComponent, mapCommon, map } from '@kit.MapKit';
import { AsyncCallback } from '@kit.BasicServicesKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { display } from '@kit.ArkUI';

@Entry
@Component
struct HuaweiMapDemo {
  private TAG = "HuaweiMapDemo";
  private mapOption?: mapCommon.MapOptions;
  private callback?: AsyncCallback<map.MapComponentController>;
  private mapController?: map.MapComponentController;
  @State displayHeight: number = 0
  @State message: string = 'Hello World';

  aboutToAppear(): void {
    let displayClass: Array<display.Display> = [];
    display.getAllDisplays((err: BusinessError, data: Array<display.Display>) => {
      displayClass = data;
      const errCode: number = err.code;
      if (errCode) {
        console.error('Failed to obtain all the display objects. Code: ${err.code}, message: ${err.message}');
        return;
      }
      this.displayHeight = data[0].height
      console.info('Succeeded in obtaining all the display objects. Data: ' + JSON.stringify(data));
    });

    // 地图初始化参数，设置地图中心点坐标及层级
    this.mapOption = {
      position: {
        target: {
          latitude: 39.9,
          longitude: 116.4
        },
        zoom: 10
      }
    };

    // 地图初始化的回调
    this.callback = async (err, mapController) => {
      if (!err) {
        // 获取地图的控制器类，用来操作地图
        this.mapController = mapController;
        this.mapController.on("mapLoad", () => {
          console.info(this.TAG, `on-mapLoad`);
        });
      }
    };
  }

  build() {
    Column(){
      Stack() {
        // 调用MapComponent组件初始化地图
        MapComponent({ mapOptions: this.mapOption, mapCallback: this.callback })
          .width('100%')
          .height(this.displayHeight + 'px')
          .margin({
            top: -10
          })
      }
      .expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.TOP,SafeAreaEdge.BOTTOM])
    }
  }
}