java - buttons ontop of everything in android -

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i working on calculator application android. finding difficult conveniently take screen shot of app. have put calculator on pause can write simple screen shot app. runs in notification bar , when click notification notification bar slides away , few seconds later snapshot taken. works perfectly. add functionality take snapshots full screen apps. have seen apps put sliding drawer on screen onto of whatever app running. there button on screen no matter doing when click/drag sliding drawer came out. how did that? should simple process use button instead of drawer , when it's clicked hide it, snapshot , unhide it.

so question bsically is

how can put usable button on screen stays above whatever app running, homescreen

i realize i'm not answering question directly, if want screen capture of application running, use ddms in android tools directory. has menu option getting screen grab. use frequently.

just go device > screen capture

more details here : http://developer.android.com/guide/developing/debugging/ddms.html


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