appium使用相对坐标定位元素

# -*-encoding:utf-8 -*-

import os
import unittest
import HTMLTestRunner
from test_platform import URL
from test_platform import platform
from appium import webdriver
from time import sleep

# 设定系数
a = 554.0/1080
b = 1625.0/1794


class Login(unittest.TestCase):
    def setUp(self):
        platform['appPackage'] = 'com.xxxxxxxxx'
        platform['appActivity'] = '.ui.activity.LoginActivity'
        #platform['appWaitActivity'] = '.MainActivity_'

        desired_caps = platform
        self.driver = webdriver.Remote(URL,desired_caps)

        self.driver.implicitly_wait(30)


    def  tearDown(self):
        self.driver.quit()

    def test_login(self):
        el = self.driver.find_element_by_xpath("\
            //android.widget.TextView[contains(@resource-id,'com.xxxxx/etRole')]")
        if el:
            el.click()
            # 以xml格式打印当前页面内容
            # print self.driver.page_source.encode("utf-8")
            # self.driver.find_element_by_name("家长").click()


            # 获取当前手机屏幕大小X,Y
            X = self.driver.get_window_size()['width']
            Y = self.driver.get_window_size()['height']
            # 屏幕坐标乘以系数即为用户要点击位置的具体坐标,当前app内为选择用户角色为“家长”
            self.driver.tap([(a*X, b*Y)],)
        # 输入手机号码
        self.driver.find_element_by_xpath("\
            //android.widget.EditText[contains(@resource-id,'com.xxxxx:id/etAccount')]")\
            .send_keys("***********")

        # 输入密码
        self.driver.find_element_by_xpath("\
            //android.widget.EditText[contains(@resource-id,'com.xxxxxx.qh:id/etPasswd')]") \
                .send_keys("123456")


        # 点击登录按钮
        self.driver.find_element_by_xpath("\
            //android.widget.Button[contains(@resource-id,'com.xxxxxx:id/btnLogin')]").click()

        sleep(5)

        # 当前账号存在多个孩子，选择孩子后登录app
        self.driver.find_element_by_xpath("\
            //android.widget.TextView[contains(@text,'徐熙媛')]").click()



if __name__ == '__main__':
    unittest.main()