例如xpath里面的click方法，会去调用
def click(self, timeout=None):
"""find element and perform click"""
try:
el = self.get(timeout=timeout)
el.click()
except XPathElementNotFoundError:
if not self._fallback:
raise
logger.info("element not found, run fallback")
return inject_call(self._fallback, d=self._d)
最终会调用 _do_dump_hierarchy函数
dump_hierarchy会使用socket进行通讯，传输当前设备的UI DOM树，导致每次xpath操作socket传递大量字节数据，如果使用while True函数：不断调用d.xpath(xpath字符串).exists或者click方法，长时间会导致设备端出现内存泄漏，设备端u2服务崩掉导致通信无法响应；
希望作者大大，可以考虑在手机和电脑端通信优化下内存增长这块的问题；
还有一个是d(text="字符串").click()，为什么要和xpath的click方法是分开的？
因为d(text="字符串").click()，没有调用_do_dump_hierarchy，直接获取组件的objInfo，通信的内容仅仅是组件的bounds信息；似乎从UI DOM树中获取组件信息是在java端进行的，但是xpath中的方法，是在python端解析组件的信息，这一点比较困惑；
elif u2dev.xpath('//*[@text="Camera error"]').exists:
File "D:\python\lib\site-packages\uiautomator2\xpath.py", line 434, in exists
return len(self.all()) > 0
File "D:\python\lib\site-packages\uiautomator2\xpath.py", line 427, in all
source = self._get_page_source()
File "D:\python\lib\site-packages\uiautomator2\xpath.py", line 421, in _get_page_source
return self._parent.get_page_source()
File "D:\python\lib\site-packages\uiautomator2\xpath.py", line 199, in get_page_source
return PageSource.parse(self.d.dump_hierarchy())
File "D:\python\lib\site-packages\uiautomator2_init.py", line 107, in dump_hierarchy
content = self._do_dump_hierarchy(compressed, max_depth)
File "D:\python\lib\site-packages\decorator.py", line 235, in fun
return caller(func, *(extras + args), **kw)
File "D:\python\lib\site-packages\retry\api.py", line 73, in retry_decorator
return __retry_internal(partial(f, *args, **kwargs), exceptions, tries, delay, max_delay, backoff, jitter,
File "D:\python\lib\site-packages\retry\api.py", line 33, in _retry_internal
return f()
File "D:\python\lib\site-packages\uiautomator2_init.py", line 122, in _do_dump_hierarchy
content = self.jsonrpc.dumpWindowHierarchy(compressed, max_depth)
File "D:\python\lib\site-packages\uiautomator2\base.py", line 158, in call
return self.server.jsonrpc_call(self.method, params, http_timeout)
File "D:\python\lib\site-packages\uiautomator2\core.py", line 311, in jsonrpc_call
return _jsonrpc_call(self._dev, self._device_server_port, method, params, timeout, self._debug)
File "D:\python\lib\site-packages\uiautomator2\core.py", line 173, in _jsonrpc_call
r = _http_request(dev, device_port, "POST", "/jsonrpc/0", payload, timeout=timeout, print_request=print_request)
File "D:\python\lib\site-packages\uiautomator2\core.py", line 140, in _http_request
_response = conn.getresponse()
File "D:\python\lib\http\client.py", line 1377, in getresponse
response.begin()
File "D:\python\lib\http\client.py", line 320, in begin
version, status, reason = self._read_status()
File "D:\python\lib\http\client.py", line 289, in _read_status
raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without response
例如xpath里面的click方法，会去调用
def click(self, timeout=None):
"""find element and perform click"""
try:
el = self.get(timeout=timeout)
el.click()
except XPathElementNotFoundError:
if not self._fallback:
raise
logger.info("element not found, run fallback")
return inject_call(self._fallback, d=self._d)
最终会调用 _do_dump_hierarchy函数
dump_hierarchy会使用socket进行通讯，传输当前设备的UI DOM树，导致每次xpath操作socket传递大量字节数据，如果使用while True函数：不断调用d.xpath(xpath字符串).exists或者click方法，长时间会导致设备端出现内存泄漏，设备端u2服务崩掉导致通信无法响应；
希望作者大大，可以考虑在手机和电脑端通信优化下内存增长这块的问题；
还有一个是d(text="字符串").click()，为什么要和xpath的click方法是分开的？
因为d(text="字符串").click()，没有调用_do_dump_hierarchy，直接获取组件的objInfo，通信的内容仅仅是组件的bounds信息；似乎从UI DOM树中获取组件信息是在java端进行的，但是xpath中的方法，是在python端解析组件的信息，这一点比较困惑；
elif u2dev.xpath('//*[@text="Camera error"]').exists:
File "D:\python\lib\site-packages\uiautomator2\xpath.py", line 434, in exists
return len(self.all()) > 0
File "D:\python\lib\site-packages\uiautomator2\xpath.py", line 427, in all
source = self._get_page_source()
File "D:\python\lib\site-packages\uiautomator2\xpath.py", line 421, in _get_page_source
return self._parent.get_page_source()
File "D:\python\lib\site-packages\uiautomator2\xpath.py", line 199, in get_page_source
return PageSource.parse(self.d.dump_hierarchy())
File "D:\python\lib\site-packages\uiautomator2_init.py", line 107, in dump_hierarchy
content = self._do_dump_hierarchy(compressed, max_depth)
File "D:\python\lib\site-packages\decorator.py", line 235, in fun
return caller(func, *(extras + args), **kw)
File "D:\python\lib\site-packages\retry\api.py", line 73, in retry_decorator
return __retry_internal(partial(f, *args, **kwargs), exceptions, tries, delay, max_delay, backoff, jitter,
File "D:\python\lib\site-packages\retry\api.py", line 33, in _retry_internal
return f()
File "D:\python\lib\site-packages\uiautomator2_init.py", line 122, in _do_dump_hierarchy
content = self.jsonrpc.dumpWindowHierarchy(compressed, max_depth)
File "D:\python\lib\site-packages\uiautomator2\base.py", line 158, in call
return self.server.jsonrpc_call(self.method, params, http_timeout)
File "D:\python\lib\site-packages\uiautomator2\core.py", line 311, in jsonrpc_call
return _jsonrpc_call(self._dev, self._device_server_port, method, params, timeout, self._debug)
File "D:\python\lib\site-packages\uiautomator2\core.py", line 173, in _jsonrpc_call
r = _http_request(dev, device_port, "POST", "/jsonrpc/0", payload, timeout=timeout, print_request=print_request)
File "D:\python\lib\site-packages\uiautomator2\core.py", line 140, in _http_request
_response = conn.getresponse()
File "D:\python\lib\http\client.py", line 1377, in getresponse
response.begin()
File "D:\python\lib\http\client.py", line 320, in begin
version, status, reason = self._read_status()
File "D:\python\lib\http\client.py", line 289, in _read_status
raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without response