I tried to move an ImageView on touch events by this code: http://pastebin.com/Wr033FfP
At first, everything worked well on Nexus 5 (Android 4.4.4 and Lollipop). But then I tried on older versions of Android like 4.0.4(Galaxy S2) or Nexus S(4.1.1)... and none of them worked. Then after struggling for a while, I came up with this solution and it worked well on all devices: (Notice that now, I keep track of the ImageView's matrix object by a local object instead of getting it via ImageView's getImageMatrix()) http://pastebin.com/UyrwivAh I got the solution but I still couldn't get why my former code didn't work?! I tried to research but the only thing made sense was the documentation of ImageView's getImageMatrix(): Return the view's optional matrix. This is applied to the view's drawable when it is drawn. If there is no matrix, this method will return an identity matrix. Do not change this matrix in place but make a copy. If you want a different matrix applied to the drawable, be sure to call setImageMatrix(). Then it made me more confused by saying Do not change this matrix in place but make a copy, what's the point of doing so? why can't I just do like I did in the former code? (get the current matrix of the ImageView then apply translation, then set it back via setImageMatrix() as the documentation says) Someone please shed me some light, this is too much confusion for me. -- 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 --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
