The UI doesn't use these values. We use the density field instead so that the conversion factor is the same on both axis. On May 24, 2013 2:56 AM, "Rick" <[email protected]> wrote:
> I was just being hti by this problem as I'm working on my own UI engine > and I need to calculate my own device indepentent unit ratio using these > XDPI and YDPI values.... So how the Android native UI is calculating the > DP (independent device unit) on a device where the DPI is incorrectly set? > Does tha mean the native UI is then wrongly scaled as well? > Thanks for any usful information. > > Rick > > On Tuesday, 25 October 2011 22:27:04 UTC+2, Dianne Hackborn wrote: >> >> Sorry you just can't use them. Nothing in the platform makes use of >> them. They need to be set by the manufacturer (there is no way for the >> platform to know what they are), and as of today they are just not >> consistently set correctly across devices, and because nothing in the >> platform relies on them it is easy for devices to have them set incorrectly. >> >> This information is just not available, sorry to say. >> >> Why do you need the actual physical dpi? >> >> On Tue, Oct 25, 2011 at 12:44 PM, ashughes <[email protected]> wrote: >> >>> The values reported by xdpi and ydpi are still incorrect on some devices. >>> >>> Samsung Galaxy Tab 10.1 (from Google I/O): >>> xdpi: 160.15764 >>> ydpi: 160.0 >>> >>> Lenovo ThinkPad Tablet: >>> xdpi: 160.15764 >>> ydpi: 160.0 >>> >>> HTC Jetstream: >>> xdpi: 150.51852 >>> ydpi: 149.41176 >>> >>> The Galaxy Tab and ThinkPad Tablet report incorrect values, while the >>> Jetstream reports correct values. I don't know why the xdpi and ydpi values >>> are different (unless they *actually* are on they physical display, in >>> which case that makes sense since both values for the Jetstream are close >>> to the correct overall value). >>> >>> Is the value reported by xdpi and ydpi set somewhere by the device >>> manufacturer? Is that why the values are correct on some devices and not on >>> others? Is there going to be any guarantee in the future that these values >>> will always be reported as correct (it would be great if this were a >>> requirement for passing the CTS)? >>> >>> It would be really helpful to be able to reliably query for the actual >>> dpi of a device without having to rely on a database of known device values. >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Android Developers" group. >>> To post to this group, send email to android-d...@**googlegroups.com >>> To unsubscribe from this group, send email to >>> android-developers+**[email protected] >>> For more options, visit this group at >>> http://groups.google.com/**group/android-developers?hl=en<http://groups.google.com/group/android-developers?hl=en> >>> >> >> >> >> -- >> 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 > --- > 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/groups/opt_out. > > > -- -- 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/groups/opt_out.
