Re: [android-developers] Android devices and use of MM/INCH
You're right... This is the config of DisplayMetrics of One X: xdpi = 240 widthPixels = 480 We can deduce that the screen have a width of 2 inches... but in real - 2,25 inches So, is there a solution to determine this automatically? Or is it impossible to have real mesure on all devices? Le mardi 28 août 2012 16:06:06 UTC+2, Latimerius a écrit : On Tue, Aug 28, 2012 at 3:07 PM, Thesalan thes...@gmail.com javascript: wrote: For a project, I have to use real size, like millimeters and inches. But on some devices, these values are false! I have tested on some devices, and it appears that on HTC One X and HTC Wildfire, 10mm = 11/12mm... But on Nexus One, Nexus S, Galaxy S2 these sizes are right! To do this, I use this code : float pxCm = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_MM, 10, r.getDisplayMetrics()); Someone have already encounter this problem? If yes, how have you bypass this? One thing I noticed is that devices can lie about their DPI. For instance, LG P500 states it has a 160 dpi screen but if you measure the screen and do the maths, it's actually 180 dpi. Correspondingly, if you compute your pixel sizes based on the 160 dpi figure to get a specified physical size (in mm), it will come out smaller. I'd compute the actual DPI One X and Wildfire have and compare that to figures in DisplayMetrics. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Android devices and use of MM/INCH
On Thu, Aug 30, 2012 at 2:37 PM, Thesalan thesa...@gmail.com wrote: You're right... This is the config of DisplayMetrics of One X: xdpi = 240 widthPixels = 480 We can deduce that the screen have a width of 2 inches... but in real - 2,25 inches That's your explanation then - if the screen is physically bigger by 12.5% than it should, everything on the screen will come out bigger by the same amount. So your desired 10 mm becomes 12.5 mm. So, is there a solution to determine this automatically? Or is it impossible to have real mesure on all devices? Unfortunately, I'm aware of no work-arounds. Perhaps somebody else is... I think the cause might be that manufacturers don't bother to fill in actual densities for their screens. 240 dpi is used to represent the hdpi range, 160 dpi (wrongly reported by my LG) is the typical density for mdpi. I believe they are used as defaults and never changed to match the actual screen. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Android devices and use of MM/INCH
For a project, I have to use real size, like millimeters and inches. But on some devices, these values are false! I have tested on some devices, and it appears that on HTC One X and HTC Wildfire, 10mm = 11/12mm... But on Nexus One, Nexus S, Galaxy S2 these sizes are right! To do this, I use this code : float pxCm = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_MM, 10, r.getDisplayMetrics()); Someone have already encounter this problem? If yes, how have you bypass this? Thanks in advance -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Android devices and use of MM/INCH
On Tue, Aug 28, 2012 at 3:07 PM, Thesalan thesa...@gmail.com wrote: For a project, I have to use real size, like millimeters and inches. But on some devices, these values are false! I have tested on some devices, and it appears that on HTC One X and HTC Wildfire, 10mm = 11/12mm... But on Nexus One, Nexus S, Galaxy S2 these sizes are right! To do this, I use this code : float pxCm = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_MM, 10, r.getDisplayMetrics()); Someone have already encounter this problem? If yes, how have you bypass this? One thing I noticed is that devices can lie about their DPI. For instance, LG P500 states it has a 160 dpi screen but if you measure the screen and do the maths, it's actually 180 dpi. Correspondingly, if you compute your pixel sizes based on the 160 dpi figure to get a specified physical size (in mm), it will come out smaller. I'd compute the actual DPI One X and Wildfire have and compare that to figures in DisplayMetrics. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
