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On May 12, 9:10 am, Dianne Hackborn <[email protected]> wrote: > Sorry as things are today you basically can't do this because many devices > are not reporting the correct true screen dpi. If they did, the correct way > to do this would be to use a physical unit for your dimensions --- that is > "10mm" if you want 10mm. But as I say, there are many devices out there > that are not configured with the correct physical screen dpi do these units > are at this point not usable. > > > > > > > > > > On Thu, May 12, 2011 at 8:50 AM, Ab <[email protected]> wrote: > > I want to put a toolbar in my application. The toolbar will use > > ImageViews as application buttons. I would like the ImageViews to be > > the exact same size regardless device; by "same size" I mean that, > > when rendered to the screen, if I measure them with a ruler, the > > dimensions will be the same. I would like this size to be ~10mm (the > > width of my index finger). > > > I have been completely unsuccessful in accomplishing this. > > > I am testing on a MDPI, large screen Acer Iconia Tab and a HDPI medium > > screen Samsung Galaxy Tab. If I set layout_width="50dip" and > > layout_height="50dip", the buttons render as ~10mm on the Samsung, and > > ~8mm on the Acer. If I set the buttons as layout_width="12mm" and > > layout_height="12mm", they render as 12mm on the Acer and ~9mm on the > > Galaxy (confusing that 50dip renders bigger on the Galaxy than the > > Acer, but 12 mm renders smaller on the Galaxy than on the Acer). > > > If I place a 32pix x 32pix icon in my drawable-mdpi folder (and no > > equivalent in the drawable-hdpi folder), and set > > layout_width="wrap_content" and layout_height="wrap_content"; the > > results are similar to if set to 50dip, the Samsung is about 10mm, the > > Acer about 8mm. If I add a 48pix x 48pix icon to my drawable-hdpi > > folder, there is no change; presumably because the Acer still uses the > > mdpi icon and the Samsung uses the bigger one, but scales it down by > > 50% because it knows its hdpi (if am confident that this surprising > > scaling occurs because if I move the 48pix icon to the mdpi folder, > > and have nothing in the hdpi folder, the icon shows very large on the > > Samsung). > > > I then attempted to calculate the number of pixels necessary for 10mm > > based on the values of xdpi and ydpi from DisplayMetrics: 10 mm in > > pixels = xdpi * 10 / 25.4. On the galaxy, this is 168.89 * 10 / 25.4 > > = 66. However, when I set the layout_width to 66, the button measured > > ~8mm wide. But, at 168.89 dpi, the dots per mm should be 6.64 > > (168.89/25.4), so 66pixels should be approximately 10mm. So, how > > could it measure 8mm? The Galaxy must be scaling down the layout > > parameters somehow. Is there any way to retrieve how much they are > > scaling down by, so that I can adjust for it? > > > I am confused and could really use advice. How do I make my button > > fingertip sized regardless of dpi and screen size? > > > -- > > 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 > > -- > 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
