How to have a Smooth integer increment while touching screen - Android Q&A, Help & Troubleshooting

Hi all,
After googles and forum looking it is time to ask you
I am a new Android developer, but I am a java and C++ developer, so my problems are just sdk and Android experience.
I am trying to develop an app that have a square area of 200dp in the screen center, and when we touch it with a movement an integer is incremented (or decremented) like a smooth scrollbar (one int for Vertical and one int for Horizontal)
I tried with NestedScrollView and with SurfaceView to get scroll position, but it did not the job.
Have you some idea about to way to do it?
Thanks a lot by advance

Hi,
anyone have an idea about this problem?
Thanks by advance

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