[ubuntu] How To Install Adnroid SDK in Ubuntu Linux?

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http://ubuntuforums.org – Ubuntu: 12.04 LTS How can i install the linux version of Android SDK from the official developer site in my Ubuntu 12.04 LTS? Im downloading the "android-sdk_r20.0.3-linux.tgz" file but i have no clue how to install such files. Usually when i download softwares etc from the website like TeamViewer or Skype, the download automatically starts with Ubuntu Software Centre, but alot of the files dont start that way. They apparently have to be installed manually i guess. Can you guys help me learn how to install such files? thanks alot... EDIT - This is the installation guide provided (Hardware)