How to create Nexus 4 camera like popup control on a map - android

Hi guys I'm trying to create a custom popup control, which would be shown after the user has long-pressed on a Google map. I would like the control to look something like in the nexus' 4 camera application: see it here.
Can anyone suggest how to start?
I have also searched in the native camera app code found here, but I'm totally lost in all that code. Has someone come across a tutorial of how to build such control? I really googled a lot but couldn't find any solutions.

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