robotframework切换webview

*** Settings ***
Suite Setup
Suite Teardown
Library           AppiumLibrary

*** Variables ***

*** Test Cases ***
手机淘宝
    Open Application    http://localhost:4723/wd/hub    platformName=Android    platformVersion=19    deviceName=emulator-5554    app=${CURDIR}${/}shoujitaobao_178.apk    appPackage=com.taobao.taobao
    ...    appActivity=com.taobao.tao.welcome.Welcome    unicodeKeyboard=True    resetKeyboard=True
    Wait Until Page Contains Element    xpath=//android.widget.TextView[@text=\"天猫国际\"]
    Click Element    xpath=//android.widget.TextView[@text=\"天猫国际\"]
    @{contexts}    Get Contexts
    Log Many    @{contexts}
    ${cur_context}    Get Current Context
    log    当前context
    log    ${cur_context}
    log    开始切换
    Switch To Context    WEBVIEW_com.taobao.taobao
    log    切换成功
    ${cur_context}    Get Current Context
    log    ${cur_context}
    ${page}    Log Source
    log    ${page}
    Page Should Contain Text    美妆
    Click Element    xpath=//*[@id="J_5132393350"]/div/div/div/a[2]
    sleep    10
    [Teardown]    Close All Applications

*** Keywords ***