接前面的常用API（一），本文接着介绍如下：
1.press_keycode
press_keycode(self, keycode, metastate=None):
Sends a keycode to the device. Android only. Possible keycodes can be found in http://developer.android.com/reference/android/view/KeyEvent.html
发送按键码（安卓仅有），模拟点击相应铵键，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
Usage:
driver.press_ keycode(‘4’) #按返回键
2.long_press_keycode
long_press_keycode(self, keycode, metastate=None):
Sends a long press of keycode to the device. Android only.
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
Usage：
driver.long_press_keycode(‘4’) #长按返回键
3.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
Usage:
driver.is_app_installed(“com.xxxx”) #app包名
4.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
Usage:
driver.install_app(app_path)
5.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
Usage:
driver.remove_app(“com.xxx.”) #app包名
6.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）
Usage:
driver.open_notifications() ##打开系统通知栏
7.launch_app
launch_app(self):
Start on the device the application specified in the desired capabilities.
启动app
Usage:
driver.launch_app() #启动应用，一般与close_app配合使用
8.close_app
close_app(self):
Stop the running application, specified in the desired capabilities, on the device.
关闭app
Usage:
driver.close_app() #关闭应用，此方法并非真正的关闭应用，相当于按home键将应用置于后台，可以通过launch_app()再次启动
9.is_selected
is_selected(self):
Returns whether the element is selected.
Can be used to check if a checkbox or radio button is selected.
可以用来检查一个复选框或单选按钮被选中，返回元素是否选择 True of False
Usage:
element.is_slected()
10.is_enabled
is_enabled(self):
Returns whether the element is enabled.
返回元素是否可用True of False
Usage:
element.is_enabled()
11.is_displayed
is_displayed(self):
Whether the element is visible to a user.
判断此元素用户是否可见。返回True of False
Usage:
driver.element.is_displayed() #判断是否显示
12.close
close(self):
Closes the current window.
关闭当前窗口
Usage:
driver.close()