Pushing Adview to top when keyboard pops out

I have seen this on the Urban Dictionary app (screenshot below). When there is no keyboard, the adview is at the bottom. But when you touch the editbox, prompting the keyboard to come out, the adview moves itself to the top of the keyboard.

I realise it will be possible to move the Adview with SetLayout, but the question is how can we know the Top value? Does all Android keyboards have a fixed height?