> I am planning to create a J2ME application for Map Rendering

For a new project you'll want to be using v3 Maps API, not the old v2
which is the subject of this group.

> showing current location of vehicle in google map.

Be sure to check the terms of use before going too far, the FAQ is
helpful here
http://code.google.com/apis/maps/faq.html#tos_nonweb
Your application needs to be freely downloadable by anyone
http://code.google.com/apis/maps/faq.html#tos_tracking
We all need to be able to track your vehicle, which could raise
privacy or security issues

> For this, I want to
> get the map image by providing current latitude, longitude and zoom
> level. I could able to find Google Map API URL for doing this much
> actions. But, while the vehicle moving, I want to show the movement in
> map without retreiving the map image again.

The API manages all this by itself, fetching map tiles as needed.  Are
you trying to create a map application without internet access?  The
API is the wrong tool for that.

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