MapView does not override "public Parcelable View.onSaveInstanceState()" (not to be messed up with lifecycle method onSaveInstanceState(Bundle outState)) and therefore looses its state in situations that rely on this mechanism. Example: The FragmentManager saves state of the view hierachy (including all views which have IDs) when a fragment is detached to be able to restore it later when the fragment is beeing re-attached. Lifecylce method onSaveInstanceState(Bundle outState) is *not* called in this case.

As MapView does not override View.onSaveInstanceState(), its state is not saved which leads to an uninitialized (completely zoomed out and centered at (0,0)) map after re-attaching the fragment.

As a consequence, MapView cannot be used inside custom fragments which are detached / re-attached. However, this is badly needed, e.g. when working with ActionBar tabs. As tab contents itself are typically fragments and we cannot have nested fragments prior API Level 17, we have to define a fragment containing some other view elements and a MapView.


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