Suggestion for a more efficient time picker
The currently used time picker is ok (as used by many current Android apps) but really not very efficient.
Maybe you could use the concept as used for example by Google Calendar.
I dont know whether they supply this as an API function already.
Please see attached screenshots.
On the first one you select the hour - extremely quick. And on the second as quickly the minute.
Third one shows a nice take on date selection.