Put this:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<bitmap
android:gravity="center"
android:src="@drawable/launch_image"
android:tileMode="disabled" >
</bitmap>
</item>
</layer-list>
in your background_launch.xml
instead of trying to reference a state list in android:src
for <bitmap\>
A state list is not a bitmap -- that's what the error's telling you.