我正在用selenium、appium和RubyGems测试一个Android混合应用程序。当我尝试使用

element = driver.find_element(:id => "image0")
element.click

我收到一个错误，说它找不到对象。然后我了解到我需要从Native App切换到WebView。尝试切换到Webview时

driver.switch_to.window("WEBVIEW")

我收到一条错误消息，显示“...尚未实现...”
那么，我如何切换到Web，这样我就可以点击webelement，然后使用RubyGems切换回Native_App？
添加...当我尝试driver.switch_to.context（“WebView”）时，我收到错误undefined method `context' for #（NoMethodError）
你知道为什么我会收到上下文错误吗？

require 'rubygems'
require 'selenium-webdriver'
require 'uri'
require 'appium_lib'
require_relative 'SDK_Navigation'
mySampleApp = SampleApp.new
myNavigation = Navigation.new
myProducts = Products.new
myProductEditor = ProductEditor.new
caps = Selenium::WebDriver::Remote::Capabilities.android
caps['deviceName'] = 'fegero'
caps['platformName'] = 'Android'
caps['app'] = 'C:\Users\ScottFeger\Downloads\SampleApp_1105.apk'
driver = Selenium::WebDriver.for(
  :remote,
  :url => "http://127.0.0.1:4723/wd/hub",
  :desired_capabilities => caps)
mySampleApp.PickImagebtn(driver)
mySampleApp.SelectAlbum(driver, "All Photos")
mySampleApp.SelectImage(driver,"bob")
myNavigation.SelectParent(driver, "Home & Office")
myNavigation.SelectChild(driver, "Home Decor")
myProducts.SelectProduct(driver,"Coasters")
myProductEditor.AddPhoto(driver)
#================================================================
#WEBVIEW - Where my problem begins
#driver.execute_script 'mobile: tap', x: 150 , y: 300 // WORKS
driver.available_context
driver.switch_to.context("WebView")
#Click on an image
element = driver.find_element(:id => "image0")
element.click