I am using eclipse junno for my IDE for developing android programs.
my problem is just like this one :
User Operation is waiting for "Building Workspace"
why did it happened and how can I solve this?
I have waited lots of time about this case.
right now it is look like this.

Eclipse can have a tendency to hang sometimes for no apparent reason (usually because of memory). Just try restarting it and see if the problem persists. I’ve encountered this before and restarting Eclipse or the PC altogether usually solves it.