I\'m a new user to this interesting forum!
I want start developing an application for android and before starting i want learn about some android features...
Check out this tutorial on drawing with a canvas in Android. There are some source code examples there for you as well.
Also, the Android developer's guide and tutorials on the Google site are great. That's what I started with.
The ApiDemos that come with the SDK have an example called TouchPaint that does exactly this... it's a simple little finger drawing app. The source is actually very easy to read and it shows all of the basics.