问题:在使用 appium 运行 contactmanager 的 ruby 脚本时,无法使用 tag_name 进行元素定位.

环境:
Window7_64bit 系统,安装了以下最新的 appium gem 包

*** LOCAL GEMS ***
appium_console (1.0.3)
appium_lib (6.0.0)

运行成功的代码 (使用 name,id 定位):

# encoding: utf-8
require 'rubygems'
require 'appium_lib'

describe 'ContactForAppium' do
   APP_PATH = 'D:/Appium_Script/apps/ContactManager.apk'
   def desired_caps
      {
         caps:       {
            app:               APP_PATH,
            appActivity:      '.ContactManager',
            appPackage:       'com.example.android.contactmanager',
            platformName:     'android',
            platformVersion:  '4.4.2',#API:19
            deviceName:       'emulator-5554',
         },
         appium_lib: {
            sauce_username: nil,
            sauce_access_key: nil,
            debug: true,
            wait: 60
         }
      }
   end

   before do
      @driver = Appium::Driver.new(desired_caps).start_driver
   end

   after do
      @driver.quit
   end

   it 'Contact' do
      el = @driver.find_element(:name, 'Add Contact')
      puts el.text
      el.click
      id = @driver.find_element(:id, "com.example.android.contactmanager:id/contactNameEditText")
      id.send_keys("My name")
      phone = @driver.find_element(:id, "com.example.android.contactmanager:id/contactPhoneEditText")
      phone.send_keys("13800000001")
      email = @driver.find_element(:id, "com.example.android.contactmanager:id/contactEmailEditText")
      email.send_keys("someone@somewhere.com")
      @driver.find_element(:name, "Save").click
   end
end

运行失败的代码 (使用 tag_name 定位):

# encoding: utf-8
require 'rubygems'
require 'appium_lib'

describe 'ContactForAppium' do
   APP_PATH = 'D:/Appium_Script/apps/ContactManager.apk'
   def desired_caps
      {
         caps:       {
            app:               APP_PATH,
            appActivity:      '.ContactManager',
            appPackage:       'com.example.android.contactmanager',
            platformName:     'android',
            platformVersion:  '4.4.2',#API:19
            deviceName:       'emulator-5554',
         },
         appium_lib: {
            sauce_username: nil,
            sauce_access_key: nil,
            debug: true,
            wait: 60
         }
      }
   end

   before do
      @driver = Appium::Driver.new(desired_caps).start_driver
   end

   after do
      @driver.quit
   end

   it 'Contact' do
      name = @driver.find_element(:name, 'Add Contact')
      puts name.text
      name.click
      tag_name = @driver.find_elements(:tag_name, "textfield")
      tag_name.send_keys("My name")    
   end
end

报错 log:

d:\Appium_Script\spec>rspec -f doc ContactForAppium2_fail.rb

ContactForAppium
Add Contact
  Contact (FAILED - 1)

Failures:

  1) ContactForAppium Contact
     Failure/Error: tag_name = @driver.find_elements(:tag_name, 'textfield')
     Selenium::WebDriver::Error::UnknownCommandError:
       Invalid locator strategy: tag name
     # ./ContactForAppium2_fail.rb:38:in `block (2 levels) in <top (required)>'

Finished in 31.73 seconds (files took 0.64104 seconds to load)
1 example, 1 failure

Failed examples:

rspec ./ContactForAppium2_fail.rb:34 # ContactForAppium Contact