Appium+Python+Android，识别toast提示信息

　　很久很久以前，为了识别Android手机应用上的toast提示信息，在脚本中加入了adb的截图+Python三方库（Tesseract-OCR）图片识别，过程很辛苦，结果很失望，根本截不到toast提示。

　　翻旧账，一定要搞定toast，查了很多资料，最后又回来了：查找元素！没错，就是它。。。

　　话不多说，直接上代码：

　　一顿乱导。。。

import time
from appium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By

desired_caps = {}
desired_caps['platformName'] = 'Android'
desired_caps['platformVersion'] = '5.1.1'
desired_caps['deviceName'] = '127.0.0.1:62001'
desired_caps['appPackage'] = 'com.doctor.yy'
desired_caps['appActivity'] = 'com.doctor.br.activity.LauncherActivity'
desired_caps['unicodeKeyboard'] = True
desired_caps['resetKeyboard'] = True
desired_caps['automationName'] = 'uiautomator2'
dr = webdriver.Remote("http://127.0.0.1:4723/wd/hub", desired_caps)

x = dr.get_window_size()['width']

y = dr.get_window_size()['height']

# 滑他
time.sleep(1)
dr.swipe(x*0.9,y*0,x*0.1,y*0,1000)

# 再滑他
time.sleep(1)
dr.swipe(x*0.9,y*0,x*0.1,y*0,1000)

# 接着滑他
time.sleep(1)
dr.swipe(x*0.9,y*0,x*0.1,y*0,1000)

# 好了，滑进去了
time.sleep(1)
dr.find_element_by_id('com.doctor.yy:id/iv_enter').click()

time.sleep(1)
dr.find_element_by_id('com.doctor.yy:id/iv_enter').click()

time.sleep(1)
dr.find_element_by_id('com.doctor.yy:id/et_username').send_keys('13600000015')

time.sleep(1)
dr.find_element_by_id('com.doctor.yy:id/et_password').send_keys('25800000')

time.sleep(1)
dr.find_element_by_id('com.doctor.yy:id/btn_login').click()

# 自定义一个定位器，要查找的toast内容为：账号或者密码错误！
toast_loc = (By.XPATH,".//*[contains(@text,'帐号或者密码错误！')]") 
toast_text = WebDriverWait(driver=dr,timeout=5).until(EC.presence_of_element_located(toast_loc)) 

# 输出一下，查看一下元素的文本内容
print (toast_text.text)