According to the Complete Installation Guide for Android SDK/ADT Bundle on Ubuntu (already answered in 'askubuntu.com'), I tried to install 'android sdk' and everything was fine up to 4th option (up to '4. installing packages') but after 4th option, from 5th (5. Editing ".bashrc") when I am proceeding, after running
gedit ~/.bashrc
in terminal a blank text is appearing. Could not proceed further.