When my app starts, the title bar is hidden. However, if I leave the app and then return (minimize or phone goes to sleep), there is a blank bar inserted at the top. Is this an intentional feature? How can I prevent it? It seems that the bar goes away after I press the menu key.

This is the relevant line in the manifest file:

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"

Thanks