: http://123maza.com/65/rings780/: http://123maza.com/65/rings780/
On May 12, 8:50 am, Ab <abe.oppenh...@gmail.com> 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 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
