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Appium Python API
2017-11-17 16:06:24         来源:CrissChan的专栏  
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Appium Python API

(by appium 1.4.13.1)

- .contexts

contexts(self):

    Returns the contexts within the current session.    
    返回当前会话中的上下文,使用后可以识别H5页面的控件   

    :Usage:    
    driver.contexts


    用法 driver.contexts

- . current_context

current_context(self):

Returns the current context of the current session.
返回当前会话的当前上下文
:Usage:
    driver.current_context
用法driver. current_context

- . context

context(self):

    Returns the current context of the current session.
    返回当前会话的当前上下文。
    :Usage:
        driver.context
用法driver. Context

- . find_element_by_ios_uiautomation

find_element_by_ios_uiautomation(self, uia_string):

Finds an element by uiautomation in iOS.
    通过iOS uiautomation查找元素
    :Args:
     - uia_string - The element name in the iOS UIAutomation library

    :Usage:
        driver.find_element_by_ios_uiautomation('.elements()[1].cells()[2]')
用法dr. find_element_by_ios_uiautomation(‘elements’)

-. find_element_by_accessibility_id

find_element_by_accessibility_id(self, id):

Finds an element by accessibility id.
    通过accessibility id查找元素
    :Args:
     - id - a string corresponding to a recursive element search using the
     Id/Name that the native Accessibility options utilize

    :Usage:
        driver.find_element_by_accessibility_id()
用法driver.find_element_by_accessibility_id(‘id’)

- .scroll

scroll(self, origin_el, destination_el):

Scrolls from one element to another
    从元素origin_el滚动至元素destination_el
    :Args:
     - originalEl - the element from which to being scrolling
     - destinationEl - the element to scroll to

    :Usage:
        driver.scroll(el1, el2)
用法 driver.scroll(el1,el2)

- . drag_and_drop

drag_and_drop(self, origin_el, destination_el):

Drag the origin element to the destination element
    将元素origin_el拖到目标元素destination_el
    :Args:
     - originEl - the element to drag
     - destinationEl - the element to drag to
用法 driver.drag_and_drop(el1,el2)

- .tap

tap(self, positions, duration=None):

Taps on an particular place with up to five fingers, holding for a certain time
模拟手指点击(最多五个手指),可设置按住时间长度(毫秒)

    :Args:
     - positions - an array of tuples representing the x/y coordinates of
     the fingers to tap. Length can be up to five.
     - duration - (optional) length of time to tap, in ms

    :Usage:
        driver.tap([(100, 20), (100, 60), (100, 100)], 500)
用法 driver.tap([(x,y),(x1,y1)],500)

- . swipe

swipe(self, start_x, start_y, end_x, end_y, duration=None):

Swipe from one point to another point, for an optional duration.
    从A点滑动至B点,滑动时间为毫秒
    :Args:
     - start_x - x-coordinate at which to start
     - start_y - y-coordinate at which to start
     - end_x - x-coordinate at which to stop
     - end_y - y-coordinate at which to stop
     - duration - (optional) time to take the swipe, in ms.

    :Usage:
        driver.swipe(100, 100, 100, 400)
用法 driver.swipe(x1,y1,x2,y2,500)

- .flick

flick(self, start_x, start_y, end_x, end_y):

Flick from one point to another point.
    按住A点后快速滑动至B点
    :Args:
     - start_x - x-coordinate at which to start
     - start_y - y-coordinate at which to start
     - end_x - x-coordinate at which to stop
     - end_y - y-coordinate at which to stop

    :Usage:
        driver.flick(100, 100, 100, 400)

用法 driver.flick(x1,y1,x2,y2)

- .pinch

pinch(self, element=None, percent=200, steps=50):

Pinch on an element a certain amount
    在元素上执行模拟双指捏(缩小操作)
    :Args:
     - element - the element to pinch
     - percent - (optional) amount to pinch. Defaults to 200%
     - steps - (optional) number of steps in the pinch action

    :Usage:
        driver.pinch(element)
用法 driver.pinch(element)

- .zoom

zoom(self, element=None, percent=200, steps=50):

Zooms in on an element a certain amount
    在元素上执行放大操作
    :Args:
     - element - the element to zoom
     - percent - (optional) amount to zoom. Defaults to 200%
     - steps - (optional) number of steps in the zoom action

    :Usage:
        driver.zoom(element)
用法 driver.zoom(element)

- .reset

reset(self):

Resets the current application on the device.
重置应用(类似删除应用数据)
用法 driver.reset()
14. hide_keyboard
hide_keyboard(self, key_name=None, key=None, strategy=None):

Hides the software keyboard on the device. In iOS, use `key_name` to press a particular key, or `strategy`. In Android, no parameters are used.
    隐藏键盘,iOS使用key_name隐藏,安卓不使用参数

    :Args:
     - key_name - key to press
     - strategy - strategy for closing the keyboard (e.g., `tapOutside`)
driver.hide_keyboard()

- . keyevent

keyevent(self, keycode, metastate=None):

Sends a keycode to the device. Android only. Possible keycodes can be found in https://developer.android.com/reference/android/view/KeyEvent.html.
    发送按键码(安卓仅有),按键码可以上网址中找到
    :Args:
     - keycode - the keycode to be sent to the device
     - metastate - meta information about the keycode being sent
用法 dr.keyevent(‘4’)
16. press_keycode
press_keycode(self, keycode, metastate=None):

Sends a keycode to the device. Android only. Possible keycodes can be found in https://developer.android.com/reference/android/view/KeyEvent.html.
    发送按键码(安卓仅有),按键码可以上网址中找到

    :Args:
     - keycode - the keycode to be sent to the device
     - metastate - meta information about the keycode being sent
用法 driver.press_ keycode(‘4’)
dr.keyevent(‘4’)与driver.press_ keycode(‘4’) 功能实现上一样的,都是按了返回键

- . long_press_keycode

long_press_keycode(self, keycode, metastate=None):

Sends a long press of keycode to the device. Android only. Possible keycodes can be
    found in https://developer.android.com/reference/android/view/KeyEvent.html.
    发送一个长按的按键码(长按某键)
    :Args:
     - keycode - the keycode to be sent to the device
     - metastate - meta information about the keycode being sent
 用法 driver.long_press_keycode(‘4’)

- .current_activity

current_activity(self):

Retrieves the current activity on the device.
获取当前的activity
用法 print(driver.current_activity())

- . wait_activity

wait_activity(self, activity, timeout, interval=1):

Wait for an activity: block until target activity presents or time out.
    This is an Android-only method.
    等待指定的activity出现直到超时,interval为扫描间隔1秒
即每隔几秒获取一次当前的activity
返回的True 或 False
    :Agrs:
     - activity - target activity
     - timeout - max wait time, in seconds
     - interval - sleep interval between retries, in seconds
用法driver.wait_activity(‘.activity.xxx’,5,2)

- . background_app

background_app(self, seconds):

Puts the application in the background on the device for a certain duration.
    后台运行app多少秒
    :Args:
     - seconds - the duration for the application to remain in the background
用法 driver.background_app(5)   置后台5秒后再运行

- .is_app_installed

is_app_installed(self, bundle_id):

Checks whether the application specified by `bundle_id` is installed on the device.
    检查app是否有安装
返回 True or False
    :Args:
     - bundle_id - the id of the application to query
用法 driver.is_app_installed(“com.xxxx”)

- .install_app

install_app(self, app_path):

Install the application found at `app_path` on the device.
    安装app,app_path为安装包路径
    :Args:
     - app_path - the local or remote path to the application to install
用法 driver.install_app(app_path)

- .remove_app

remove_app(self, app_id):

Remove the specified application from the device.
    删除app
    :Args:
     - app_id - the application id to be removed
用法 driver.remove_app(“com.xxx.”)

- .launch_app

launch_app(self):

Start on the device the application specified in the desired capabilities.
启动app
用法 driver.launch_app()

- .close_app

close_app(self):

Stop the running application, specified in the desired capabilities, on the device.
关闭app
用法 driver.close_app()
启动和关闭app运行好像会出错

- . start_activity

start_activity(self, app_package, app_activity, **opts):

Opens an arbitrary activity during a test. If the activity belongs to
    another application, that application is started and the activity is opened.

    This is an Android-only method.
    在测试过程中打开任意活动。如果活动属于另一个应用程序,该应用程序的启动和活动被打开。
这是一个安卓的方法
    :Args:
    - app_package - The package containing the activity to start.
    - app_activity - The activity to start.
    - app_wait_package - Begin automation after this package starts (optional).
    - app_wait_activity - Begin automation after this activity starts (optional).
    - intent_action - Intent to start (optional).
    - intent_category - Intent category to start (optional).
    - intent_flags - Flags to send to the intent (optional).
    - optional_intent_arguments - Optional arguments to the intent (optional).
    - stop_app_on_reset - Should the app be stopped on reset (optional)?
用法 driver.start_activity(app_package, app_activity)

- .lock

lock(self, seconds):

Lock the device for a certain period of time. iOS only.
    锁屏一段时间  iOS专有
    :Args:
     - the duration to lock the device, in seconds
用法 driver.lock()

- .shake

shake(self):

Shake the device.
摇一摇手机
用法 driver.shake()

- .open_notifications

open_notifications(self):

Open notification shade in Android (API Level 18 and above)
打系统通知栏(仅支持API 18 以上的安卓系统)
用法 driver.open_notifications()

- .network_connection

network_connection(self):

Returns an integer bitmask specifying the network connection type.
    Android only.
返回网络类型  数值
    Possible values are available through the enumeration `appium.webdriver.ConnectionType`

用法 driver.network_connection

- . set_network_connection

set_network_connection(self, connectionType):

Sets the network connection type. Android only.
    Possible values:
        Value (Alias)      | Data | Wifi | Airplane Mode
        -------------------------------------------------
        0 (None)           | 0    | 0    | 0
        1 (Airplane Mode)  | 0    | 0    | 1
        2 (Wifi only)      | 0    | 1    | 0
        4 (Data only)      | 1    | 0    | 0
        6 (All network on) | 1    | 1    | 0
    These are available through the enumeration `appium.webdriver.ConnectionType`
    设置网络类型
    :Args:
     - connectionType - a member of the enum appium.webdriver.ConnectionType

用法  先加载from appium.webdriver.connectiontype import ConnectionType
dr.set_network_connection(ConnectionType.WIFI_ONLY)
ConnectionType的类型有
NO_CONNECTION = 0
AIRPLANE_MODE = 1
WIFI_ONLY = 2
DATA_ONLY = 4
ALL_NETWORK_ON = 6

- . available_ime_engines

available_ime_engines(self):

Get the available input methods for an Android device. Package and activity are returned (e.g., ['com.android.inputmethod.latin/.LatinIME'])
    Android only.
返回安卓设备可用的输入法
用法print(driver.available_ime_engines)

- .is_ime_active

is_ime_active(self):

Checks whether the device has IME service active. Returns True/False.
    Android only.
检查设备是否有输入法服务活动。返回真/假。
安卓
用法 print(driver.is_ime_active())

- .activate_ime_engine

activate_ime_engine(self, engine):

Activates the given IME engine on the device.
    Android only.
    激活安卓设备中的指定输入法,设备可用输入法可以从“available_ime_engines”获取
    :Args:
     - engine - the package and activity of the IME engine to activate (e.g.,
        'com.android.inputmethod.latin/.LatinIME')

用法 driver.activate_ime_engine(“com.android.inputmethod.latin/.LatinIME”)

- .deactivate_ime_engine

deactivate_ime_engine(self):

Deactivates the currently active IME engine on the device.
    Android only.
关闭安卓设备当前的输入法
用法 driver.deactivate_ime_engine()

- .active_ime_engine

active_ime_engine(self):

Returns the activity and package of the currently active IME engine (e.g.,
    'com.android.inputmethod.latin/.LatinIME').
    Android only.
    返回当前输入法的包名

- . toggle_location_services

toggle_location_services(self):

Toggle the location services on the device. Android only.
打开安卓设备上的位置定位设置
用法 driver.toggle_location_services()
38.set_location
set_location(self, latitude, longitude, altitude):

Set the location of the device
    设置设备的经纬度
    :Args:
     - latitude纬度 - String or numeric value between -90.0 and 90.00
     - longitude经度 - String or numeric value between -180.0 and 180.0
     - altitude海拔高度- String or numeric value
用法 driver.set_location(纬度,经度,高度)

- .tag_name

tag_name(self):

This element's ``tagName`` property.
返回元素的tagName属性
经实践返回的是class name
用法 element.tag_name()

- .text

text(self):

The text of the element.
    返回元素的文本值
用法 element.text()
41.click
click(self):

Clicks the element.
  点击元素
用法 element.click()

- .submit

submit(self):

Submits a form.
    提交表单
用法 暂无

- .clear

clear(self):

Clears the text if it's a text entry element.
    清除输入的内容
用法 element.clear()

- .get_attribute

get_attribute(self, name):
详见@chenhengjie123 的超级链接

Gets the given attribute or property of the element.
1、获取 content-desc 的方法为 get_attribute("name") ,而且还不能保证返回的一定是 content-desc (content-desc 为空时会返回 text 属性值)
2、get_attribute 方法不是我们在 uiautomatorviewer 看到的所有属性都能获取的(此处的名称均为使用 get_attribute 时使用的属性名称):
可获取的:
字符串类型:
name(返回 content-desc 或 text)
text(返回 text)
className(返回 class,只有 API=>18 才能支持)
resourceId(返回 resource-id,只有 API=>18 才能支持)
    This method will first try to return the value of a property with the
    given name. If a property with that name doesn't exist, it returns the
    value of the attribute with the same name. If there's no attribute with
    that name, ``None`` is returned.

    Values which are considered truthy, that is equals "true" or "false",
    are returned as booleans.  All other non-``None`` values are returned
    as strings.  For attributes or properties which do not exist, ``None``
    is returned.

    :Args:
        - name - Name of the attribute/property to retrieve.

    Example::

        # Check if the "active" CSS class is applied to an element.
        is_active = "active" in target_element.get_attribute("class")
用法:详见下一章

- .is_selected

is_selected(self):

Returns whether the element is selected.

    Can be used to check if a checkbox or radio button is selected.
返回元素是否选择。
可以用来检查一个复选框或单选按钮被选中。
用法 element.is_slected()

- .is_enabled

is_enabled(self):

Returns whether the element is enabled.
    返回元素是否可用True of False
用法 element.is_enabled()

- .find_element_by_id

find_element_by_id(self, id_):

Finds element within this element's children by ID.
    通过元素的ID定位元素
    :Args:
        - id_ - ID of child element to locate.
用法 driver. find_element_by_id(“id”)

- . find_elements_by_id

find_elements_by_id(self, id_):

Finds a list of elements within this element's children by ID.
    通过元素ID定位,含有该属性的所有元素
    :Args:
        - id_ - Id of child element to find.
用法 driver. find_elements_by_id(“id”)

- . find_element_by_name

find_element_by_name(self, name):

Finds element within this element's children by name.
     通过元素Name定位(元素的名称属性text)
    :Args:
        - name - name property of the element to find.
用法 driver.find_element_by_name(“name”)

-. find_elements_by_name

find_elements_by_name(self, name):

Finds a list of elements within this element's children by name.
    通过元素Name定位(元素的名称属性text),含有该属性的所有元素
    :Args:
        - name - name property to search for.
用法 driver.find_element_by_name(“name”)

- . find_element_by_link_text

find_element_by_link_text(self, link_text):

Finds element within this element's children by visible link text.
    通过元素可见链接文本定位
    :Args:
        - link_text - Link text string to search for.
用法 driver.find_element_by_link_text(“text”)

- . find_elements_by_link_text

find_element_by_link_text(self, link_text):

 Finds a list of elements within this element's children by visible link text
    通过元素可见链接文本定位,含有该属性的所有元素
    :Args:
        - link_text - Link text string to search for.
用法 driver.find_elements_by_link_text(“text”)

- . find_element_by_partial_link_text

find_element_by_partial_link_text(self, link_text):

Finds element within this element's children by partially visible link text.
    通过元素部分可见链接文本定位
    :Args:
        - link_text - Link text string to search for.
driver. find_element_by_partial_link_text(“text”)

- . find_elements_by_partial_link_text

find_elements_by_partial_link_text(self, link_text):

Finds a list of elements within this element's children by link text.
    通过元素部分可见链接文本定位,含有该属性的所有元素
    :Args:
        - link_text - Link text string to search for.
driver. find_elements_by_partial_link_text(“text”)

- . find_element_by_tag_name

find_element_by_tag_name(self, name):

Finds element within this element's children by tag name.
    通过查找html的标签名称定位元素
    :Args:
        - name - name of html tag (eg: h1, a, span)
用法  driver.find_element_by_tag_name(“name”)

- . find_elements_by_tag_name

find_elements_by_tag_name(self, name):

Finds a list of elements within this element's children by tag name.
   通过查找html的标签名称定位所有元素
    :Args:
        - name - name of html tag (eg: h1, a, span)
用法driver.find_elements_by_tag_name(“name”)

- . find_element_by_xpath

find_element_by_xpath(self, xpath):

Finds element by xpath.
    通过Xpath定位元素,详细方法可参阅https://www.w3school.com.cn/xpath/
    :Args:
        xpath - xpath of element to locate.  "//input[@class='myelement']"

    Note: The base path will be relative to this element's location.

    This will select the first link under this element.

    ::

        myelement.find_elements_by_xpath(".//a")

    However, this will select the first link on the page.

    ::

        myelement.find_elements_by_xpath("//a")

用法 find_element_by_xpath(“//*”)

- . find_elements_by_xpath

find_elements_by_xpath(self, xpath):

Finds elements within the element by xpath.

    :Args:
        - xpath - xpath locator string.

    Note: The base path will be relative to this element's location.

    This will select all links under this element.

    ::

        myelement.find_elements_by_xpath(".//a")

    However, this will select all links in the page itself.

    ::

        myelement.find_elements_by_xpath("//a")

用法find_elements_by_xpath(“//*”)

- . find_element_by_class_name

find_element_by_class_name(self, name):

Finds element within this element's children by class name.
    通过元素class name属性定位元素
    :Args:
        - name - class name to search for.
用法 driver. find_element_by_class_name(“android.widget.LinearLayout”)

- . find_elements_by_class_name

find_elements_by_class_name(self, name):

Finds a list of elements within this element's children by class name.
    通过元素class name属性定位所有含有该属性的元素
    :Args:
        - name - class name to search for.
用法 driver. find_elements_by_class_name(“android.widget.LinearLayout”)

- . find_element_by_css_selector

find_element_by_css_selector(self, css_selector):

Finds element within this element's children by CSS selector.
    通过CSS选择器定位元素
    :Args:
        - css_selector - CSS selctor string, ex: 'a.nav#home'

- .send_keys

send_keys(self, *value):

Simulates typing into the element.
    在元素中模拟输入(开启appium自带的输入法并配置了appium输入法后,可以输入中英文)
    :Args:
        - value - A string for typing, or setting form fields.  For setting
        file inputs, this could be a local file path.

    Use this to send simple key events or to fill out form fields::

        form_textfield = driver.find_element_by_name('username')
        form_textfield.send_keys("admin")

    This can also be used to set file inputs.

    ::

        file_input = driver.find_element_by_name('profilePic')
        file_input.send_keys("path/to/profilepic.gif")
        # Generally it's better to wrap the file path in one of the methods
        # in os.path to return the actual path to support cross OS testing.
        # file_input.send_keys(os.path.abspath("path/to/profilepic.gif"))
driver.element.send_keys(“中英”)

- . is_displayed

is_displayed(self):

Whether the element is visible to a user.    
此元素用户是否可见。简单地说就是隐藏元素和被控件挡住无法操作的元素(仅限 Selenium,appium是否实现了类似功能不是太确定)这一项都会返回 False

用法 driver.element.is_displayed()

- . location_once_scrolled_into_view

location_once_scrolled_into_view(self):

 """THIS PROPERTY MAY CHANGE WITHOUT WARNING. Use this to discover
    where on the screen an element is so that we can click it. This method
    should cause the element to be scrolled into view.

    Returns the top lefthand corner location on the screen, or ``None`` if
    the element is not visible.
    暂不知道用法
    """

- .size

size(self):

The size of the element.
获取元素的大小(高和宽)

new_size["height"] = size["height"]
new_size["width"] = size["width"]

用法 driver.element.size

- . value_of_css_property

value_of_css_property(self, property_name):

The value of a CSS property.
CSS属性

用法 暂不知

- .location

location(self):

The location of the element in the renderable canvas.
    获取元素左上角的坐标

用法 driver.element.location
'''返回element的x坐标, int类型'''
driver.element.location.get('x')
'''返回element的y坐标, int类型'''
driver.element.location.get('y')

- .rect

rect(self):

A dictionary with the size and location of the element.
    元素的大小和位置的字典

- . screenshot_as_base64

screenshot_as_base64(self):

    Gets the screenshot of the current element as a base64 encoded string.
    获取当前元素的截图为Base64编码的字符串
    :Usage:
        img_b64 = element.screenshot_as_base64

- .execute_script

execute_script(self, script, *args):

    Synchronously Executes JavaScript in the current window/frame.
在当前窗口/框架(特指 Html 的 iframe )同步执行 javascript 代码。你可以理解为如果这段代码是睡眠5秒,这五秒内主线程的 javascript 不会执行
    :Args:
     - script: The JavaScript to execute.
     - \*args: Any applicable arguments for your JavaScript.

    :Usage:
        driver.execute_script('document.title')

- .execute_async_script

execute_async_script(self, script, *args):

    Asynchronously Executes JavaScript in the current window/frame.
插入 javascript 代码,只是这个是异步的,也就是如果你的代码是睡眠5秒,那么你只是自己在睡,页面的其他 javascript 代码还是照常执行
    :Args:
     - script: The JavaScript to execute.
     - \*args: Any applicable arguments for your JavaScript.

    :Usage:
        driver.execute_async_script('document.title')

- .current_url

current_url(self):

    Gets the URL of the current page.
    获取当前页面的网址。
    :Usage:
        driver.current_url
用法 driver.current_url

- . page_source

page_source(self):

    Gets the source of the current page.
    获取当前页面的源。
    :Usage:
        driver.page_source

- .close

close(self):

    Closes the current window.
    关闭当前窗口
    :Usage:
        driver.close()

- .quit

quit(self):

    Quits the driver and closes every associated window.
    退出脚本运行并关闭每个相关的窗口连接
    :Usage:
        driver.quit()

10 appium get_attribute 问题描述

问题描述
当使用类似下面的代码获取元素的 content-desc 属性时,会报 NoSuchElement 错误:

self.driver.find_element_by_id("id").get_attribute("content-desc")

但使用如下代码却能正常执行:

self.driver.find_element_by_id("id").click()

很明显,这个错误原因不是找不到元素,而是 get_attribute 出问题。

问题原因探究

appium server 在 android 原生应用上获取 attribute 的大致流程为:

从 client 收到获取 attribute 的请求
把请求转发给在手机上运行的 bootstrap
bootstrap 调用相关方法进行实际操作
bootstrap 返回结果给 appium server
appium server 把结果返回给 client

通过排查各部分的代码发现,错误是在 bootstrap 产生的(排查过程涉及代码有点多,所以这里就不解释了),所以看看 bootstrap 相关源码

lib/devices/android/bootstrap/src/io/appium/android/bootstrap/handler/GetAttribute.java
@Override
  public AndroidCommandResult execute(final AndroidCommand command)
  throws JSONException {
if (command.isElementCommand()) {
  // only makes sense on an element
  final Hashtable params = command.params();

  try {
// 获取需要操作的 element 实例
final AndroidElement el = command.getElement();
// 获取需要获取的 attribute 的名称
final String attr = params.get("attribute").toString();
if (attr.equals("name") || attr.equals("text")
|| attr.equals("className") || attr.equals("resourceId")) {
  // 如果 attribute 名称为 name, text, className, resourceId ,调用元素的 getStringAttribute 方法获取
  return getSuccessResult(el.getStringAttribute(attr));
} else {
  // 否则调用 getBoolAttribute 获取 (我们的 'content-desc' 执行的是这段语句)
  return getSuccessResult(String.valueOf(el.getBoolAttribute(attr)));
}
  } catch (final NoAttributeFoundException e) {
// 从这里开始就是第一个坑,无论是什么错误,最终返回的都是 NO_SUCH_ELEMENT
return new AndroidCommandResult(WDStatus.NO_SUCH_ELEMENT,
e.getMessage());
  } catch (final UiObjectNotFoundException e) {
return new AndroidCommandResult(WDStatus.NO_SUCH_ELEMENT,
e.getMessage());
  } catch (final Exception e) { // el is null
return new AndroidCommandResult(WDStatus.NO_SUCH_ELEMENT,
e.getMessage());
  }
} else {
  // 没有给出需要获取属性的 element ,返回错误信息
  return getErrorResult("Unable to get attribute without an element.");
}
  }

其中 getStringAttribute 和 getBoolAttribute 源码如下:

lib/devices/android/bootstrap/src/io/appium/android/bootstrap/AndroidElement.java
public String getStringAttribute(final String attr)
      throws UiObjectNotFoundException, NoAttributeFoundException {
    String res;
    if (attr.equals("name")) {
      // 坑2:属性名称为 name 时,会先尝试获取 content-desc ,如果 content-desc 为空,则获取 text 。说白了,就算用 name 也不能保证你获取的就是 content-desc
      res = getContentDesc();
      if (res.equals("")) {
        res = getText();
      }
    } else if (attr.equals("text")) {
      res = getText();
    } else if (attr.equals("className")) {
      res = getClassName();
    } else if (attr.equals("resourceId")) {
      res = getResourceId();
    } else {
      throw new NoAttributeFoundException(attr);
    }
    return res;
  }
...
public boolean getBoolAttribute(final String attr)
      throws UiObjectNotFoundException, NoAttributeFoundException {
    boolean res;
    // 这个方法只会获取值为布尔类型的属性,我们的 content-desc 的值不是布尔类型的,所以抛出 NoAttributeFoundException
    if (attr.equals("enabled")) {
      res = el.isEnabled();
    } else if (attr.equals("checkable")) {
      res = el.isCheckable();
    } else if (attr.equals("checked")) {
      res = el.isChecked();
    } else if (attr.equals("clickable")) {
      res = el.isClickable();
    } else if (attr.equals("focusable")) {
      res = el.isFocusable();
    } else if (attr.equals("focused")) {
      res = el.isFocused();
    } else if (attr.equals("longClickable")) {
      res = el.isLongClickable();
    } else if (attr.equals("scrollable")) {
      res = el.isScrollable();
    } else if (attr.equals("selected")) {
      res = el.isSelected();
    } else if (attr.equals("displayed")) {
      res = el.exists();
    } else {
      throw new NoAttributeFoundException(attr);
    }
    return res;
  }

总结

1、获取 content-desc 的方法为 get_attribute(“name”) ,而且还不能保证返回的一定是 content-desc (content-desc 为空时会返回 text 属性值)
2、get_attribute 方法不是我们在 uiautomatorviewer 看到的所有属性都能获取的(此处的名称均为使用 get_attribute 时使用的属性名称):

可获取的:

字符串类型:

name(返回 content-desc 或 text)
text(返回 text)
className(返回 class,只有 API=>18 才能支持)
resourceId(返回 resource-id,只有 API=>18 才能支持)

布尔类型(如果无特殊说明, get_attribute 里面使用的属性名称和 uiautomatorviewer 里面的一致):

enabled
checkable
checked
clickable
focusable
focused
longClickable(返回 long-clickable)
scrollable
selected
displayed(此元素是否在当前界面存在。调用的是 UIObject 的 exists() 方法,详情请看 https://developer.android.com/reference/android/support/test/uiautomator/UiObject.html#exists())

*
获取不到,但会显示在 uiautomatorviewer 中的属性*:

index
package
password
bounds(可通过 get_position 来获取其中部分内容)
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