Brad,
30.09.2010 20:12, Brad Gies пишет:
Actually, just confirmation that the 24, 32 and 48 are the right sizes
for the smaller icons is quite helpful. I can guess at the correct
sizes for the larger icons, and then adjust as I test the different
AVD's...
The "reference" device densities are: 120 / 160 / 240 for ldpi / mdpi /
hdpi respectively.
http://developer.android.com/guide/practices/screens_support.html#range
This means that if you design the artwork you call "larger icons" at a
certain size, then the hdpi version should be 6/4 (== 3/2), and ldpi -
3/4 the size of the mdpi version (so hdpi artwork is exactly twice as
tall / wide as ldpi).
The mdpi size should preferably be such it can be scaled to 3/2 and 3/4
of the original size without producing fractional pixels.
I am another developer who loathes doing graphics for his programs, and
rightly so, since I'm pretty bad at it.
What I found useful is to design my artwork in Photoshop at mdpi (==
"normal") density first, trying to use shape objects and to avoid
pixel-based tools as much as possible. This is important for next step:
scaling the image up in Photoshop to go from mdpi to hdpi, since shapes
scale up much better than raster data.
At this point I have with two Photoshop files, one for mdpi and one for
hdpi. I then use "File | Save for Web & Devices" to export optimized
.PNG images.
The mdpi and hdpi already have the right dimensions for exporting, so no
problem there. To create the ldpi version, I export the mdpi file and
specify smaller dimensions right in the export parameters window. I
found that Photoshop often produces a better quality reduced size image
than Android does at runtime, so having pre-built ldpi images is useful.
Not all images need this, though: for some, it's ok to just have the
mdpi and hdpi versions, and let Android do the scaling down for ldpi.
This workflow could be simplified by working in Photoshop only at hdpi
density, and scaling during export for mdpi as well as ldpi. My first
Android phone was an HTC Hero (mdpi), so I kind of made mdpi the center
of my artwork-related process.
And finally, the link below lists standard icon sizes for various screen
densities depending on where and how they are to be used (Launcher,
Dialog, List View, etc.)
http://developer.android.com/guide/practices/ui_guidelines/icon_design.html
--
Kostya Vasilyev -- WiFi Manager + pretty widget -- http://kmansoft.wordpress.com
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