Showing Custom POI (Android)

Showing Custom POI (Android)

Can you help?
Background Info.
I have android google maps v2 running in activity2 no problems. In
Activity1 I want to plot POI's onto google maps in activity2, I have an
xml created with my POI data.
Question: I want my android app activity1 to run like this:
1) Select one option A-Z? "user selects: M"
2) What colour inside field M? M-Blue, M-Red, M-Green? "user selects:M-Green"
3) Now Select Range (M-Green 1 to M-Green 200) "user selects:M-Green 17
through to M-Green M21"
And then it shows markers M17,M18,M19,M20,M21 on android google maps on
the next activity.
What would be the best way to implement this? Im not after your code
before you ask just an ideal direction i.e. any resourses/webpages that
will help me complete this actual task please?
Thank you for your time. Adrian.