HarmonyOS 如何获取状态栏高度

// MainPage.ets
import window from '@ohos.window';

@Entry
@Component
struct MainPage {
    @State private statusBarHeight: number = 0;

    build() {
        Column({ space: 20, alignItems: ItemAlign.Center }) {
            Text(`Status Bar Height: ${this.statusBarHeight} px`)
                .fontSize(20)
                .textAlign(TextAlign.Center)

            Button("Get Status Bar Height")
                .onClick(() => this.getStatusBarHeight())
        }.padding(20)
    }

    onShow() {
        this.getStatusBarHeight();
    }

    getStatusBarHeight() {
        try {
            window.getTopWindow().then((win) => {
                win.getProperties().then((props) => {
                    this.statusBarHeight = props.systemProperties.statusBar.height;
                });
            });
        } catch (err) {
            console.error('Failed to get status bar height:', err);
        }
    }
}

import window from '@ohos.window';  
@Entry  
@Component  
struct Index {  
  @State top: string = '0px';  
  @State bottom: string = '0px';  
  
  async getA() {  
    const mainWindow = await window.getLastWindow(getContext(this));  
    const avoidAreaType = window.AvoidAreaType.TYPE_SYSTEM; // 系统默认区域，包括状态栏，导航栏  
    const avoidArea = mainWindow.getWindowAvoidArea(avoidAreaType);  
    this.top = avoidArea.topRect.height + 'px';  
    const bottomArea = mainWindow.getWindowAvoidArea(window.AvoidAreaType.TYPE_NAVIGATION_INDICATOR);  
    this.bottom = bottomArea.bottomRect.height + 'px'  
  
  }  
  
  build() {  
    Column() {  
      Text('xxxx').margin({ top: this.top })  
      Button("改变xxxx的位置").onClick(async () => {  
        await this.getA();  
      })  
    }  
  }  
}