Map in android application project

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http://stackoverflow.com – I want to use the map in my android app project. Please anyone tell me how to create the map in my project ? In which class i have to create the map and how can i insert the values in it ? I just want to use the city names and their codes in my project and want to enter the city code as key and city name as value .For example: DEL is city code and Delhi is its Value. (HowTos)