Merging two Images of which is able to drag. Is there any Sample Source for that?

Merging two Images of which is able to drag. Is there any Sample Source
for that?

I have an ImageView that has a background image in it. Than I want to add
a small image that I want to paste inside the background image. So, the
small image must be draggable, and ok and cancel buttons should pop up
before saving.
Is there any sample source I can reference?