Android tutorial map_view

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Hello, I am working with the android tutorial map_view. I have the app running perfectly in my tablet. I have run a map_server node in my terminal after running roscore, of course. Do I need something more running to see the map in my tablet?. I can see anything about the map. It shows an orange triangle that should be the robot, but there is nothing in the background as a map should be.

Does anybody have achieved to run the android example correctly? I would be so grateful if somebody could tell me the steps to obtain it running OK.

Thanks!