前言

未加‘automationName‘: ‘Uiautomator2‘参数使用Uiautomator可以正常使用driver.keyevent()方法，使用Uiautomator2时driver.keyevent()方法报错：
selenium.common.exceptions.WebDriverException: Message: An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not proxy command to remote server. Original error: 404 - undefined

python V3.6
selenium V2.53.6
Appium-Python-Client V0.26
appium server V1.7.1
Uiautomator2

遇到问题

未加‘automationName‘: ‘Uiautomator2‘参数使用Uiautomator可以正常使用driver.keyevent()方法，使用Uiautomator2时driver.keyevent()方法报错：

from appium import webdriver
import time
from selenium.webdriver.common.touch_actions import TouchActions
from appium.webdriver.common.touch_action import TouchAction

desired_caps = {
                "platformName": "Android",
                "deviceName": "emulator-5554",     # 设备名称
                "platformVersion": "5.1.1",     # android系统版本号
                "appPackage": "com.yipiao",   # app包名
                "appActivity": "com.yipiao.activity.LaunchActivity",   # 启动launch Activity
                "noReset": True,  # 不清空数据
                'automationName': 'Uiautomator2'  # toast 必须用Uiautomator2
                }
driver = webdriver.Remote("http://127.0.0.1:4723/wd/hub", desired_caps)

time.sleep(10)    # 启动时间等待，放长一点


# Uiautomator2使用keyevent事件报错
driver.keyevent(4)    # back事件  code 4

调用keyevent方法，执行back事件，对应的code值是4，发现报错

Traceback (most recent call last):
  File "D:/apptest/ke10/t_start.py", line 25, in <module>
    driver.keyevent(4)  # back事件  code 4
  File "E:\python36\lib\site-packages\appium\webdriver\webdriver.py", line 411, in keyevent
    self.execute(Command.KEY_EVENT, data)
  File "E:\python36\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 236, in execute
    self.error_handler.check_response(response)
  File "E:\python36\lib\site-packages\appium\webdriver\errorhandler.py", line 29, in check_response
    raise wde
  File "E:\python36\lib\site-packages\appium\webdriver\errorhandler.py", line 24, in check_response
    super(MobileErrorHandler, self).check_response(response)
  File "E:\python36\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 192, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: An unknown server-side error occurred while processing the command. Original error: Could not proxy. Proxy error: Could not proxy command to remote server. Original error: 404 - undefined

主要原因是Uiautomator2上对keyevent不支持了，用driver.press_keycode()方法可以解决

press_keycode 和keyevent

查看press_keycode 和keyevent 源码，发现这2个方法没啥区别，keyevent上面有个备注Needed for Selendroid，可能是老版本里面的功能。
新版本用Uiautomator2可以使用 press_keycode 方法

# Needed for Selendroid
    def keyevent(self, keycode, metastate=None):
        """Sends a keycode to the device. Android only. Possible keycodes can be
        found in http://developer.android.com/reference/android/view/KeyEvent.html.

        :Args:
         - keycode - the keycode to be sent to the device
         - metastate - meta information about the keycode being sent
        """
        data = {
            'keycode': keycode,
        }
        if metastate is not None:
            data['metastate'] = metastate
        self.execute(Command.KEY_EVENT, data)
        return self

    def press_keycode(self, keycode, metastate=None):
        """Sends a keycode to the device. Android only. Possible keycodes can be
        found in http://developer.android.com/reference/android/view/KeyEvent.html.

        :Args:
         - keycode - the keycode to be sent to the device
         - metastate - meta information about the keycode being sent
        """
        data = {
            'keycode': keycode,
        }
        if metastate is not None:
            data['metastate'] = metastate
        self.execute(Command.PRESS_KEYCODE, data)
        return self

使用 press_keycode 替换 keyevent即可解决问题

from appium import webdriver
import time
from selenium.webdriver.common.touch_actions import TouchActions
from appium.webdriver.common.touch_action import TouchAction

desired_caps = {
                "platformName": "Android",
                "deviceName": "emulator-5554",     # 设备名称
                "platformVersion": "5.1.1",     # android系统版本号
                "appPackage": "com.yipiao",   # app包名
                "appActivity": "com.yipiao.activity.LaunchActivity",   # 启动launch Activity
                "noReset": True,  # 不清空数据
                'automationName': 'Uiautomator2'  # toast 必须用Uiautomator2
                }
driver = webdriver.Remote("http://127.0.0.1:4723/wd/hub", desired_caps)

time.sleep(10)    # 启动时间等待，放长一点


# Uiautomator2使用keyevent事件报错
# driver.keyevent(4)    # back事件  code 4

# Uiautomator2使用press_keycode解决
driver.press_keycode(4)

keycode相关方法

• driver.press_keycode(4) #发送keycode，功能：按键 Uiautomator2使用keyevent事件报错
• driver.keyevent(4) #发送keycode，功能：按键，与press_keycode无区别 Uiautomator2正常使用
• driver.hide_keyboard() #iOS使用key_name隐藏，安卓不使用参数，功能：隐藏键盘
• driver.long_press_keycode(4) #发送keycode，功能：长按键

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appium+python自动化64-使用Uiautomator2执行driver.keyevent()方法报错解决