I am developing an Adobe Air app. I need to set an icon to the app so it is shown on the task bar. I added the icon tag to the descriptor file but it is not working and I really don't know why, any ideas?
Two things that might be throwing you off:
1) the icons block is commented out by default in the auto-generated descriptor file, and is an easy thing to overlook
2) the icons specified in a descriptor file don't appear in the app unless you build a release build, and install the resulting .air file. A debug build will only show the AIR icon.
At least these are the behaviors I experience in Flash Builder 4.
Adding the icons to your application descriptor should do it.
However, icons come in different sizes.
For example:
<icon>
<image16x16>/icons/app/icon_16.png</image16x16>
<image29x29>/icons/app/icon_29.png</image29x29>
<image32x32>/icons/app/icon_32.png</image32x32>
<image36x36>/icons/app/icon_36.png</image36x36>
<image48x48>/icons/app/icon_48.png</image48x48>
<image57x57>/icons/app/icon_57.png</image57x57>
<image72x72>/icons/app/icon_72.png</image72x72>
<image114x114>/icons/app/icon_114.png</image114x114>
<image128x128>/icons/app/icon_128.png</image128x128>
<image512x512>/icons/app/icon_512.png</image512x512>
</icon>
If I'm not mistaken, the 32x32 icon should be the one that is displayed in the taskbar.
Obviously, make sure that you are referring to the correct path in your descriptor file.
One more thing. I just wasted over an hour on this: For an iOS app, you won't see the icon when you drop the app into iTunes (at least not under Windows), but it will appear on your device!
来源：https://stackoverflow.com/questions/8213632/how-to-set-icon-to-an-adobe-air-application