First of all.. thanks Kostya and Mark for your answers.. They were very
helpful... and thanks Yahel for the link. I downloaded Smart Image
Resizer and I'm looking at the code to see if will do what I need on the
site... My idea right now is to ask users to upload an image with the
correct dimensions (height/width ratio) and in the largest size I need
or larger. Then scale them automatically, show them to the user, and
allow them to upload other images if they don't like the result :).
BUT... my plan is also to name them with memberId_image1.png and
memberid_image2.png, and just put the 3 different densities in different
folders, but pass the URL with the density needed from my Android app to
the website. Of course.. for this to work, I need to know which format
the framework has chosen.... I assume this should be easy (famous last
words)...
Is there a foolproof way of knowing which density (hdpi, mdpi, or ldpi)
the framework is going to use BEFORE the images are downloaded? In my
case, the list will already be displaying with a dummy image (something
like the way the Market app works.. or the Android Application Manager),
so the view will be inflated by the time I start downloading images...
Is there a call to ask what density it's running at?
Sincerely,
Brad Gies
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On 30/09/2010 10:02 AM, Kostya Vasilyev wrote:
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
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