Enable fullscreen view on nativescript-vue

import * as app from 'tns-core-modules/application'
import { device } from 'tns-core-modules/platform'

export function hideSystemUi () {
  if (!app.android || parseInt(device.sdkVersion) < 21) { return }
  const androidViewPkg = android.view // eslint-disable-line no-undef
  const window = app.android.startActivity.getWindow()
  window.addFlags(androidViewPkg.WindowManager.LayoutParams.FLAG_FULLSCREEN)
  window.clearFlags(androidViewPkg.WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN)
}

export function showSystemUi () {
  if (!app.android || parseInt(device.sdkVersion) < 21) { return }
  const androidViewPkg = android.view // eslint-disable-line no-undef
  const window = app.android.startActivity.getWindow()
  window.addFlags(androidViewPkg.WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN)
  window.clearFlags(androidViewPkg.WindowManager.LayoutParams.FLAG_FULLSCREEN)
}