Android - How would i go about using RelativeLayout with background image scale right on different devices -

Android - How would i go about using RelativeLayout with background image scale right on different devices -

as can see in photo have scaling problem design. there 2 problems. 1 involving textview , 1 scaling. found out easiest solution layout implement background image relativelayout. (this may stupid approach don't know.)

as can see in images, text changes position on textview.settext("blabla"). , creating visual problem. how go fixing this?

secondly, how solve scaling issue on different devices? initial plan create 1 background each size. mdpi, hdpi , on.. how tell app take between background? , possible?

am doing wrong? :)

android android-layout