HarmonyOS ArkUI中设置宽高

请参考下方代码，效果请在模拟器或真机查看，

import display  from '@ohos.display';

@Entry
@Component
struct CallArkTs04 {
  @State imgWidth: number = 100
  @State imgHeight: number = 100
  aboutToAppear() {
    display.getAllDisplays((err, data) => {
      let screenWidth : number = data[0].width
      let screenHeight : number = data[0].height
      this.imgWidth=screenWidth * 0.05
      this.imgHeight=this.imgWidth * 0.8
    })
    }
  build() {
    Column(){
      Image($r('app.media.app_icon'))
        .width(this.imgWidth)
        .height(this.imgHeight)
    }
    .width('100%')
    .height('100%')
  }
}