无法在android AVD中单击按钮

Question

我对Appium Automation非常陌生 我正在使用appium 1.13.0 Android OS：牛轧糖7.0 我在Eclips上运行的代码已创建了AVD

我用过

FindElementBy.xpath("//[@class=‘android.widget.Button’ and 
@index=‘2’]").click(),
className(“android.widget.Button”)
xpath("//android.widget.Button[contains(contains(@text,‘LOGIN’))]")
xpath("//[contains(@class, ‘android.widget.Button’)][contains(text(),‘LOGIN’)]");

对我没有任何作用

[AndroidBootstrap] Sending command to android: {“cmd”:“action”,“action”:“find”,“params”:{“strategy”:“xpath”,“selector”:"//*[@class=‘android.widget.Button’ and @index=‘2’]",“context”:"",“multiple”:false}}

[AndroidBootstrap] [BOOTSTRAP LOG] [debug] Got data from client: {“cmd”:“action”,“action”:“find”,“params”:{“strategy”:“xpath”,“selector”:"//*[@class=‘android.widget.Button’ and @index=‘2’]",“context”:"",“multiple”:false}}

[AndroidBootstrap] [BOOTSTRAP LOG] [debug] Got command of type ACTION

[AndroidBootstrap] [BOOTSTRAP LOG] [debug] Got command action: find

[AndroidBootstrap] [BOOTSTRAP LOG] [debug] Finding ‘//*[@class=‘android.widget.Button’ and @index=‘2’]’ using ‘XPATH’ with the contextId: ‘’ multiple: false