Had a similar problem trying to get the zoom controls working on my application.
It has been found that the layout for MapView MUST be set to "clickable" in order for the zoom controls to display and be operational. They don’t even show if the map
Here is a simple layout from the Android SDK site that shows the tag in the layout.
<com.google.android.maps.MapView
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true"
android:apiKey="Your Maps API Key" />
After placing this tag in the layout, everything works correctly.
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