In the Google I/O 2012 Android App an actionbar logo is used instead of the normal app icon. In the open source project I could find the image which is 340x72 and present only in this dimension. I searched if there is some specified size for using a logo in the actionbar, but I did not find anything. Do you know something about this?
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1 Answer
I looked into the resources of the YouTube app, since that seems to be the only official Google app (besides I/O) that uses an action bar logo at the moment.
It contains three drawables for the logo:
- drawable-mdpi/ic_logo_wide.png (75 x 32 px)
- drawable-hdpi/ic_logo_wide.png (112 x 48 px)
- drawable-xhdpi/ic_logo_wide.png (149 x 64 px)
According to Iconography from the Android design guidelines, those images' heights match the specification for the action bar icons, which is 32 x 32 dp.
- 32 dp = 32 px (MDPI)
- 32 dp * 1.5 = 48 px (HDPI)
- 32 dp * 2 = 64 px (XHDPI)
You'll notice that the 72 px (XHDPI) from the I/O app don't show up. I guess, they just wanted to increase the logo's height a bit.
If a drawable is only provided in XHDPI, Android scales it down, which is a little less performant than providing the images in the proper sizes. I guess, this was just accepted by the developers of the I/O app.
9 Comments
David
But they should point this in the documentation, you don't believe?
Matthias Robbers
Would not be a miss. On the other hand, it is clear that any height value between 32 dp (action bar icon) and 48 dp (launcher icon) will fit well.
Wärting
Note to self :) 32 dp * 3 = 96 px (XXHDPI)
ol_v_er
And 32 dp * 4 = 128 px (XXXHDPI)
priyankvex
Second note to self :) 186 x 96 (xxhdpi) , 223 x 128 (xxxhdpi)
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