Xpath定位：www.runoob.com/xpath/xpath…
1、滑动定位查找某个元素：
self.driver.find_element_by_android_uiautomator('new UiScrollable(new UiSelector().scrollable(true).instance(0)).scrollIntoView(new UiSelector().text("北京市").instance(0));')
2、向上查找父节点，每个/..都代表一层父节点
//*[@text='发动态']/../../../..
