如何获取系统导航栏和状态栏的高度

// MainAbility.ets
import { common, UIAbility } from '@kit.AbilityKit';
import { window } from '@kit.ArkUI';

/**

* @param context
 * @returns
 */
async function getWindowAvoidArea(context: common.UIAbilityContext): Promise<window.AvoidArea | null> {
  try {
    const mainWindow = await window.getLastWindow(context);

const avoidArea = mainWindow.getWindowAvoidArea(avoidAreaType);
    const height = avoidArea.topRect.height;
    return avoidArea
  } catch (e) {
    console.log('getWindowAvoidArea fail');
    return null
  }
}

export default class MainAbility extends UIAbility {
  // do something
  async onWindowStageCreate(windowStage: window.WindowStage) {
    getWindowAvoidArea(this.context);
    windowStage.loadContent('pages/index');
  }
  // do something
}