如何在Selenium移动webdriver中截取特定元素的截图？

from appium import webdriver
from PIL import Image

# 创建移动webdriver实例
desired_caps = {
    'platformName': 'Android',
    'deviceName': 'your_device_name',
    'appPackage': 'your_app_package',
    'appActivity': 'your_app_activity'
}
driver = webdriver.Remote('http://localhost:4723/wd/hub', desired_caps)

# 定位要截取的特定元素
element = driver.find_element_by_xpath('//xpath_of_element')

# 截取整个屏幕截图
screenshot = driver.get_screenshot_as_png()

# 裁剪出特定元素的图像
location = element.location
size = element.size
image = Image.open(BytesIO(screenshot))
cropped_image = image.crop((location['x'], location['y'], location['x'] + size['width'], location['y'] + size['height']))

# 可选地，保存裁剪后的图像到本地文件系统
cropped_image.save('path_to_save_cropped_image.png')

# 关闭移动webdriver实例
driver.quit()