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The <application> tag for the Android Manifest contains a logo attribute which I have never seen before. What is the difference between your application's icon and its logo? Is it used purely for market?
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Icons are sparingly used in the user interface to guide the user, help him/her navigate, and identify the everyday tasks across the website, while a logo is only used as a primary identifier and mostly used in the headers of a website.
Sometimes, if the app is removed and/or tied to a launcher without the app installed it will show that. See if the app is still in the app drawer and re-add it to the homescreen. Mine did the same thing when I got the most recent software update.
Logos are just beyond just creating memorable graphic designs. Rather, its concept is based on the company's core image, values, goals, and even target audience. Unlike icons, logos are specific graphic representations that relay to the user what the brand is all about.
On Android devices, launcher icons are generally 96×96, 72×72, 48×48, or 36×36 pixels (depending on the device), however Android recommends your starting artboard size should be 864×864 pixels to allow for easier tweaking.
The ActionBar will use the android:logo attribute of your manifest, if one is provided. That lets you use separate drawable resources for the icon (Launcher) and the logo (ActionBar, among other things).
Source: Android: How to change the ActionBar "Home" Icon to be something other than the app icon?
setDisplayUseLogoEnabled() Enables the use of an alternative image (a "logo") in the Action Bar, instead of the default application icon. A logo is often a wider, more detailed image that represents the application. When this is enabled, the system uses the logo image defined for the application (or the individual activity) in the manifest file, with the android:logo attribute. The logo will be resized as necessary to fit the height of the Action Bar. (Best practice is to design the logo at the same size as your application icon.)
Source: http://developer.android.com/guide/topics/ui/actionbar.html#Style
To replace the icon with a logo, specify your application logo in the manifest file with the android:logo attribute, then call setDisplayUseLogoEnabled(true) in your activity.
Source: http://developer.android.com/sdk/android-3.0.html#api
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