It's pretty simple: Use theme="android:Theme.Transparent" (in AndroidManifest.xml) and use a .png with alpha channel as background of the activity's root view for the gray layer above. But be warned: This can slow down performance pretty much. E.g., I've never seen BW's animations without sagging on my Milestone. Not even overclocked to 900MHz. And even on my N1 it's rarely completely smooth.
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