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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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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:
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.
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.