I'm new in Android and CAD. I need to do an app in which user can draw objects and after export as .dwg format to open in AutoCAD and make some changes. How I can export it as .dwg? Is there any java libraries? I found library YCad to deal with .dxf format. Can you please explain me disadvantage of .dxf? I will appreciate any help.
You can use AutoCAD 360 (run on browser or mobile) and save on Autodesk cloud, then use Webdav to get the file. See https://play.google.com/store/apps/details?id=com.autodesk.autocadws
Or use AutoCAD I/O, which is a webservice, to generate .dwg files from any device (via REST calls). This is a data only webservice, so no wysiwyg editing. See http://developer.autodesk.com