I cannot drag drop widgets in Android Studio Layout Editor, I have selected blank activity but there is no app background (frame) in workspace

Question

I have installed all sdk and correctly installed but I have tried multiple times but I cannot fine frame of app where I can insert tool,widgets, button, etc. (Cannot add anything on workspace)

My Android studio window image: https://drive.google.com/file/d/0B8AWJ5JO_e0xVV9KVEE0TUpMYWc/view?usp=drivesdk

Answer 1

Select devices，sdk and theme，like this image： https://drive.google.com/open?id=0B7VdJKtF9NwGNVFKeE5zZ2pxVHM