【Android自动化】在使用uiautomator框架自动化时，往往有时再运行脚本时发现xxx实例属性不被允许

例如：

 # -*- coding:utf-8 -*-
 from uiautomator import device as d

 d(classname="android.widget.ListView", resourceId="android:id/list").click()

 输出：
 Traceback (most recent call last):
 File "E:/Project/qqqq/13.py", line 4, in <module>
 d(classname="android.widget.ListView", resourceId="android:id/list").click()
 File "C:\Python27\lib\site-packages\uiautomator-0.1.32-py2.7.egg\uiautomator\__init__.py", line 665, in __call__

 File "C:\Python27\lib\site-packages\uiautomator-0.1.32-py2.7.egg\uiautomator\__init__.py", line 257, in __init__

 File "C:\Python27\lib\site-packages\uiautomator-0.1.32-py2.7.egg\uiautomator\__init__.py", line 264, in __setitem__

 ReferenceError: classname is not allowed.

分析：

出现这种错误时一般都是实例的属性编写错误导致的，正确的应该是：className     实例属性的名字命名遵循规则为（如果只是一个单词，那首字母小写，如果是多个单词拼接，那从第二个单词开始的首字母大写如（aaBbCc），下面把uiautomator中所有实例属性key全部列出如下，不要再出错啦

 class Selector(dict):

 """The class is to build parameters for UiSelector passed to Android device.
 """
 __fields = {
 "text": (0x01, None), # MASK_TEXT,
 "textContains": (0x02, None), # MASK_TEXTCONTAINS,
 "textMatches": (0x04, None), # MASK_TEXTMATCHES,
 "textStartsWith": (0x08, None), # MASK_TEXTSTARTSWITH,
 "className": (0x10, None), # MASK_CLASSNAME
 "classNameMatches": (0x20, None), # MASK_CLASSNAMEMATCHES
 "description": (0x40, None), # MASK_DESCRIPTION
 "descriptionContains": (0x80, None), # MASK_DESCRIPTIONCONTAINS
 "descriptionMatches": (0x0100, None), # MASK_DESCRIPTIONMATCHES
 "descriptionStartsWith": (0x0200, None), # MASK_DESCRIPTIONSTARTSWITH
 "checkable": (0x0400, False), # MASK_CHECKABLE
 "checked": (0x0800, False), # MASK_CHECKED
 "clickable": (0x1000, False), # MASK_CLICKABLE
 "longClickable": (0x2000, False), # MASK_LONGCLICKABLE,
 "scrollable": (0x4000, False), # MASK_SCROLLABLE,
 "enabled": (0x8000, False), # MASK_ENABLED,
 "focusable": (0x010000, False), # MASK_FOCUSABLE,
 "focused": (0x020000, False), # MASK_FOCUSED,
 "selected": (0x040000, False), # MASK_SELECTED,
 "packageName": (0x080000, None), # MASK_PACKAGENAME,
 "packageNameMatches": (0x100000, None), # MASK_PACKAGENAMEMATCHES,
 "resourceId": (0x200000, None), # MASK_RESOURCEID,
 "resourceIdMatches": (0x400000, None), # MASK_RESOURCEIDMATCHES,
 "index": (0x800000, 0), # MASK_INDEX,
 "instance": (0x01000000, 0) # MASK_INSTANCE,
 }