HarmonyOS 如何全局避让手机底部的导航栏？

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 bottomHeight = windowClass.getWindowAvoidArea(window.AvoidAreaType.TYPE_NAVIGATION_INDICATOR).bottomRect.height  
    AppStorage.setOrCreate('bottomHeight',px2vp(bottomHeight));  
  });  
}

column().margin({ bottom: AppStorage.get('bottomHeight') })