Best and easiest method of passing map coordinates to Google maps

Hi I have developed an app that has over 100 set locations that can be accessed but at the moment I have them set in individual classes meaning I have over 100 location map classes which is lazy and far from ideal.

I want to create a database where I can store the locations and have the map class retrieve the locations when needed. I have been trying to get my head round all the options which I am going to have to learn like using a CSV file sqlite database and kml and was kind of hoping it would be as simple as putting them in an XML file and coding the retrieval. I want to stay in android and Java and don't wish to use other codes.

What is the best and easiest way to achieve it.