II.Install the Eclipse and create the workspace and open the eclipse
III.Then extract the android sdk in an particular folder
IV.Goto windows->preferences select android and give path of the sdk
V.Extract ADT in an particular folder
V.Then goto help->Install new Software in eclipse and choose what is already installed the add new the give name and give path to the ADT path and save.
VI.Then Restart the Eclipse and close. to set environmental variables go to computer(windows) icon in right click-> properties->remote settings- >advanced->environmental variables then go to system variables-> new then give name as path copy java path and paste type ';' symbol then copy sdk path and paste and save (java-path;sdk-path;)
VII.Open the eclipse.(Restart the system for better performance).