Android webview inspector

hi guys, sorry for my bad english…

i have a question,
i have installed appium 1.6.3 using node.js, i want to test android app that can login via facebook or else
i’m using uiautomatorviewer for android inspection that included on android sdk folder, but it can’t inspect a webview… how i can inspect it and how to select the element on the selector script ? i’m using javascript/node.js for testing btw

thanks, Firman