I would prefer to use Android’s default camera control – I like all the functionality it provides and whatnot – but I do want to add just one button to let users skip taking the picture. This would be different from the “back” button in that it would move users forward not backwards in the app’s process flow.
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You can’t do anything to an existing app. Also, some manufacturers implement different versions of the camera app, so it is not sure that the UI will be the same on all devices.