Hi Dianne, Thanks for the info! I was trying to use "pressure" data to control the "zoom" of an view.
I wonder if anyone else has any experience on G1. Regardless how hard I press the screen, I always get 0 for MotionEvent.getSize(). I always get larger values for my thumb than for my index and it seems MotionEvent.getPressure() always returns larger values for larger touch area/size, regardless how lightly/hard I press. Regards, On Sep 10, 3:56 pm, Dianne Hackborn <[email protected]> wrote: > Capacitive touch screens detect size much more than pressure, so in general > you will find the pressure varies closely with size (this actually is often > true on resistive screens as well, but from my experience capacitive has > even less pressure sensitivity.) > > The screen definitely reports size -- if you run Pointer Location from Dev > Tools, you will see the actual touch data, and size has always been > reported. > > Fwiw, trying to do anything useful with this data is going to be > super-tricky, because screens from different vendors can behave very > differently and the data I have seen from all of our screens is super noisy > and easy to confusing by pressing on the screen in different ways. I think > it is probably useful for things were these are treated as a very analog > signal providing direct feedback to the user (such as a drawing app where > the size/pressure modifies the pen strokes as you draw on the screen), and > not much else. > > > > On Thu, Sep 10, 2009 at 1:12 PM, smallbug <[email protected]> wrote: > > > Hi, > > > Debugging on my G1 phone, I am trying to use > > android.view.MotionEvent.getPressure() and MotionEvent.getSize(). > > > For MotionEvent.getSize(), I always get 0 (the documentation says it > > returns a value ranging from 0 to 1; > > > For MotionEvent.getPressure(), it seems to me this actually reflects > > the real finger touch size, as opposed to "pressure"; for me, I get > > values range from 0 - 0.63. > > > Am I missing anything or is it a known bug of the SDK? > > > Thanks. > > -- > Dianne Hackborn > Android framework engineer > [email protected] > > Note: please don't send private questions to me, as I don't have time to > provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
