create an application which can track the location using open street maps

I am planning to create a开发者_运维问答n application which can track the location of a certain person using open street maps. But I don't know where to start.

Have a look at the sourcecode of osmdroid, an opensource reimplementation of google's maps app using openstreetmap. They even provide a jar you can use! Should get you up to speed in no time. And possibly the official documentation on Location & Maps...