Add options menu on MapView

Further works on the exercise, AndroidMapper. A options menu will be added in AndroidMapView using XML; with options of OK, Cancel, Reload and Help.



Reload: is used to reload the initiate location.
Help: display the help message.
OK and Cancel: not yet implemented. They will be used to return to the last Activity, AndroidMapper, with or ignore the updated location.

To know more about how to add options menu using XML, refer to the article Implement option menu using XML.

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