I have a Xperia X10 Mini Pro and by some ungodly reason it's dual touch feature is not working. I have searched around the net and I have seen here and there people use terms such as real dual-touch and fake dual-touch.
I don't really understand what's the difference here? Can the dual-touch ability be faked and how is that possible?
By the way, if anyone can tell is it possible to activate the dual touch feature in my phone I would be super thankful.
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I have 2 questions. Is your phone rooted and what ROM are you using (EX custom ROM, Gingerbread Stock, etc)?– LeadByDesignAug 30, 2012 at 15:44
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It's rooted. I use GingerDX.– 2hamedAug 31, 2012 at 11:08
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2 Answers
Multitouch touch screen digitizers handle (2,3,4...) or more input fingers at a time at the hardware level.
Single touch devices handle only one finger at a time even if 2 or more are present. If you touch with a 2nd finger, the detected touch will "jump" from the first finger to the second finger location.
Install a touch screen visualizer or test application like Z device test. You can watch a video how it looks with one finger on youtube (which has fake dual touch and has some flaws).
So what a fake dual touch driver does is this:
It basically detects "jumps" of the finger and assumes it comes from a second and just keeps reporting a fixed virtual event (coming from the last known position from the (now vanished) 1st finger touch) while the 2nd touch is from your actual finger and reported regularly.
The difference between real dual-touch and fake dual-touch has to do with how the screen is built. Real touch screens have an additional layer to allow for additional inputs. There are ways to emulate dual-touch with software. This is helpful in the case of your particular phone.
This XDA forum page has a list of updates for particular ROMs including 2 stock ROMs which enable fake dual touch.
