How to building a shapefile viewer app Android?

Moved this to the Developer Forum.

Maybe you should clarify what exactly you mean with: Shapefile viewer ... Then chance is high that someone could help you

What is a shapefile viewer?

Shapefiles in general is a popular geospatial vector data format for geographic information systems software. It is developed and regulated by Esri as a (mostly) open specification for data interoperability among Esri and other software products.

Shapefiles spatially describe geometries: points, polylines, and polygons. These, for example, could represent water wells, rivers, and lakes, respectively. Each item may also have attributes that describe the items, such as the name or temperature.

Shapefiles can went quite big and therefore i'm not shure if it would be a good idea to do things like this on a mobile device. They are often used in proffesional software to visualize big amounts of geospatial data.

The following App is a Shape Viewer as described above...

SHP Viewer
Nexti inc.

Install from the Google Market


** Adobe Air 2.6 above is required.

It's a simple shape file viewer, reads shp,dbf from sd card and render it on the screen, you can touch on features to view their attributes.
You can press refresh button on the top right corner to re-read the file list.

Notes:
* Zoom map with two fingers, or just scroll the slider on the right side.
* Read files from sdcard/Maps, put your shp,dbf files here.
* Support polygon, polyline, point.
* Test on my samsung galaxy tab, it takes about 5 seconds to load a 5mb polygon file.

— modified on May 4, 2011, 8:09:17 PM

Is there any APP for android that open shape files and GPS navigation together. I mean, I want to localizate where I'm at in my shape file with the GPS of the galaxy Tab. Is that posible?

I can find some app to display shapefile in this forum. But i'm a developer, where did I start?
Thank you.