HarmonyOS 如何获取屏幕状态栏跟底部安全区域的高度?

onWindowStageCreate(windowStage: window.WindowStage) {  
  // Main window is created, set main page for this ability  
  hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate');  
  windowStage.loadContent('pages/Index', (err, data) => {  
    if (err.code) {  
      hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? '');  
      return;  
    }  
    hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? '');  
    let windowClass = windowStage.getMainWindowSync()  
    let statusHeight = windowClass.getWindowAvoidArea(window.AvoidAreaType.TYPE_SYSTEM).topRect.height;  
    let bottomHeight = windowClass.getWindowAvoidArea(window.AvoidAreaType.TYPE_NAVIGATION_INDICATOR).bottomRect.height;  
    AppStorage.setOrCreate('bottomHeight',px2vp(bottomHeight));  
    AppStorage.setOrCreate('statusHeight',px2vp(statusHeight));  
  });  
}