该方是基于uiautomator2如下版本进行验证的：
PS C:\windows\system32> pip show uiautomator2
Name: uiautomator2
Version: 1.2.2
Summary: Python Wrapper for Android UiAutomator2 test tool
Home-page: https://github.com/codeskyblue/uiautomator2
Author: codeskyblue
Author-email: codeskyblue@gmail.com
License: MIT
Location: c:\program files\python36\lib\site-packages
Requires: six, progress, whichcraft, logzero, lxml, adbutils, retry, Pillow, requests, humanize
Required-by: weditor, atx
下面贴出githup上关于该方法的使用
1 Watcher
2 You can register watchers to perform some actions when a selector does not find a match.
3
4 Register Watcher
5
6 When a selector can not find a match, uiautomator2 will run all registered watchers.
7
8 Click target when conditions match
9 d.watcher("AUTO_FC_WHEN_ANR").when(text="ANR").when(text="Wait") \
10 .click(text="Force Close")
11 # d.watcher(name) ## creates a new named watcher.
12 # .when(condition) ## the UiSelector condition of the watcher.
13 # .click(target) ## perform click action on the target UiSelector.
14 There is also a trick about click. You can use click without arguments.
15
16 d.watcher("ALERT").when(text="OK").click()
17 # Same as
18 d.watcher("ALERT").when(text="OK").click(text="OK")
19 Press key when a condition becomes true
20 d.watcher("AUTO_FC_WHEN_ANR").when(text="ANR").when(text="Wait") \
21 .press("back", "home")
22 # d.watcher(name) ## creates a new named watcher.
23 # .when(condition) ## the UiSelector condition of the watcher.
24 # .press(<keyname>, ..., <keyname>.() ## press keys one by one in sequence.
25 Check if the named watcher triggered
26
27 A watcher is triggered, which means the watcher was run and all its conditions matched.
28
29 d.watcher("watcher_name").triggered
30 # true in case of the specified watcher triggered, else false
31 Remove a named watcher
32
33 # remove the watcher
34 d.watcher("watcher_name").remove()
35 List all watchers
36
37 d.watchers
38 # a list of all registered watchers
39 Check for any triggered watcher
40
41 d.watchers.triggered
42 # true in case of any watcher triggered
43 Reset all triggered watchers
44
45 # reset all triggered watchers, after that, d.watchers.triggered will be false.
46 d.watchers.reset()
47 Remove watchers
48
49 # remove all registered watchers
50 d.watchers.remove()
51 # remove the named watcher, same as d.watcher("watcher_name").remove()
52 d.watchers.remove("watcher_name")
53 Force to run all watchers
54
55 # force to run all registered watchers
56 d.watchers.run()
注：里面涉及的watcher_name可以自定义，可以做到见名知意即可
watcher的使用是要先注册（第9行至20行均是注册watcher的方法），然后激活watcher(第56行)，注意这个激活方法只是一个瞬时激活，就是说使用之后即销毁，不会一直存于后台。那这样的话在实际的使用场景中怎么使用这个功能呢，下面看一段脚本 1 # -*- coding:utf-8 -*-
2
3 import uiautomator2 as u2
4 import time
5
6
7 d = u2.connect()
8 cfg = MTBFConfig()
9 package = cfg.getstr("Admit", "pkg", "config")
10 PACKAGELIST = package.split(",")
11 print(PACKAGELIST)
12 d.watcher("ALLOW").when(text="ALLOW").click(text="ALLOW")
13 #d.watchers.run()
14 print(d.watchers)
15
16 time.sleep(2)
17 pkglen = len(PACKAGELIST)
18 print(("There are %d package for test") %pkglen)
19
20 class Admit(object):
21
22 def main(self):
23 for i in range(pkglen):
24 k = 0
25 for j in range(5):
26 if d.info['currentPackageName'] != PACKAGELIST[i]:
27 d.app_start(PACKAGELIST[i])
28 print(PACKAGELIST[i])
29 time.sleep(1)
30 k += 1
31 if k == 3:
32 print("Can not enter "+ str(PACKAGELIST[i]))
33 return False
34 if PACKAGELIST[i] == 'com.google.android.contacts':
35 print("hello")
36 if d(description = "Open navigation drawer").exists(timeout = 5):
37 d(description = "Open navigation drawer").click()
38
39 if d(text = "Settings").exists(timeout = 5):
40 d(text = "Settings").click()
41
42 if d(resourceId="android:id/title", text = "Import").exists(timeout=5):
43 d(resourceId="android:id/title", text = "Import").click()
44 time.sleep(3)
45
46 if d(resourceId = "android:id/button1", text = "OK").exists(timeout = 5):
47 d(resourceId = "android:id/button1", text = "OK").click()
48 time.sleep(1)
49 d.watchers.run() //在上面OK点击之后会弹出一个权限访问的许可，所以这个时候需要激活一次watcher把弹框关掉，以便不影响后续测试，所以就一个原则，哪里可能会有弹框就在哪里激活watcher
50
51
52
53 if __name__=="__main__":
54 ad = Admit()
55 ad.main()