The + 0.5f is there to round up. All conversions in the platform are done rounding up and you should do the same.
On Tue, Sep 7, 2010 at 2:14 AM, jerryfan2000 <[email protected]> wrote: > Hi, > I was reading multiple screen support page on SDK doc for solving a > pixel to dpi scaling problem in my app. In the doc, it says > "// Convert the dips to pixels > final float scale = > getContext().getResources().getDisplayMetrics().density; > mGestureThreshold = (int) (GESTURE_THRESHOLD_DIP * scale + 0.5f);" > > My question is why we have to add 0.5f at the end? It indeed works > great on high density screen but failed to match the result on medium > density screen. For medium density screen, I have to remove the +0.5f. > In addition. according to the doc, px - dpi conversion works like px = > dpi x (density/160) and there is no mentioning of adding additional > 0.5 at the end. Does anybody know why and how it works? Thanks. > > -- > 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 > -- Romain Guy Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support. 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
