利用Android UiSelector（）类来定位元素

在Android自动化测试过程中，有些元素难以定位，比如一个要定位一个元素的某一个子元素，这样上篇文章讲的方法有时候不那么适用，那么我们可以利用Andorid 自带的UiSelector 类来定位元素。

el = self.driver.find_element_by_android_uiautomator('new UiSelector().text("Animation")')

els = self.driver.find_elements_by_android_uiautomator('new UiSelector().clickable(true)')     
el = self.driver.find_element_by_class_name('android.widget.ListView')
sub_el = el.find_element_by_android_uiautomator('new UiSelector().description("Animation")')

el = self.driver.find_element_by_class_name('android.widget.ListView')
sub_el = el.find_element_by_android_uiautomator('new UiSelector().description("Animation")')


el = self.driver.find_element_by_class_name('android.widget.ListView')
sub_els = el.find_elements_by_android_uiautomator('new UiSelector().clickable(true)')

UiSelector的具体方法如下：
Public constructors
UiSelector()

Public methods
checkable(boolean val)
Set the search criteria to match widgets that are checkable.

checked(boolean val)
Set the search criteria to match widgets that are currently checked (usually for checkboxes).

childSelector(UiSelector selector)
Adds a child UiSelector criteria to this selector.

className(String className)
Set the search criteria to match the class property for a widget (for example, “android.widget.Button”).

className(Class type)
Set the search criteria to match the class property for a widget (for example, “android.widget.Button”).

classNameMatches(String regex)
Set the search criteria to match the class property for a widget, using a regular expression.

clickable(boolean val)
Set the search criteria to match widgets that are clickable.

description(String desc)
Set the search criteria to match the content-description property for a widget.

descriptionContains(String desc)
Set the search criteria to match the content-description property for a widget.

descriptionMatches(String regex)
Set the search criteria to match the content-description property for a widget.

descriptionStartsWith(String desc)
Set the search criteria to match the content-description property for a widget.

enabled(boolean val)
Set the search criteria to match widgets that are enabled.

focusable(boolean val)
Set the search criteria to match widgets that are focusable.

focused(boolean val)
Set the search criteria to match widgets that have focus.

fromParent(UiSelector selector)
Adds a child UiSelector criteria to this selector which is used to start search from the parent widget.

index(int index)
Set the search criteria to match the widget by its node index in the layout hierarchy.

instance(int instance)
Set the search criteria to match the widget by its instance number.

longClickable(boolean val)
Set the search criteria to match widgets that are long-clickable.

packageName(String name)
Set the search criteria to match the package name of the application that contains the widget.

packageNameMatches(String regex)
Set the search criteria to match the package name of the application that contains the widget.

resourceId(String id)
Set the search criteria to match the given resource ID.

resourceIdMatches(String regex)
Set the search criteria to match the resource ID of the widget, using a regular expression.

scrollable(boolean val)
Set the search criteria to match widgets that are scrollable.

selected(boolean val)
Set the search criteria to match widgets that are currently selected.

text(String text)
Set the search criteria to match the visible text displayed in a widget (for example, the text label to launch an app).

textContains(String text)
Set the search criteria to match the visible text in a widget where the visible text must contain the string in your input argument.

textMatches(String regex)
Set the search criteria to match the visible text displayed in a layout element, using a regular expression.

textStartsWith(String text)
Set the search criteria to match visible text in a widget that is prefixed by the text parameter.