When running an app, how to modify/add a class file and then run it?

Question

In my case, I want to download a new .class file to update some parts of the old application. Could it be possible and how?

Or is there any other way to download data and update just part of my application?

Answer 1

Fred Chung wrote a great post about class loading on the android developers blog a while ago.

http://android-developers.blogspot.co.at/2011/07/custom-class-loading-in-dalvik.html

PS: And yes there are other ways to update your app. Just upload it to the market :)