如何获取App版本号，版本名，屏幕分辨率等信息

import bundleManager from '@ohos.bundle.bundleManager'; 
import { BusinessError } from '@ohos.base'; 
// ... 
bundleManager.getBundleInfoForSelf(bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION).then((bundleInfo)=>{ 
  let versionName = bundleInfo.versionName;//应用版本名 
  let versionNo = bundleInfo.versionCode;//应用版本号 
}).catch((error: BusinessError )=>{ 
  console.error("get bundleInfo failed,error is "+error) 
})

import common from '@ohos.app.ability.common'; 
// ... 
let context = getContext(this) as common.UIAbilityContext; 
let screenDensity = context.config.screenDensity;