Is there a way to preview a vector drawable

Android Studio 1.4 lets you preview VectorDrawables. Just double-click on them in your res/drawable folder.

There is a Preview tab especial for that at the right side (since Android Studio 2.0):

If the Preview window doesn't automatically show. You can manually show the Preview window by going to View -> Tool Windows -> Preview in Android Studio's menu.

There is a way to preview all the vector drawables in your project at the same time using the Android Studio plugin at https://plugins.jetbrains.com/plugin/10741-vector-drawable-thumbnails

just go to Settings -> Plugins -> Browse Repositories and search for "Vector Drawable Thumbnails"