hi i am using ubuntu 12.04. and in ~/.bashrc file I set following things
export ANDROID_HOME=/home/nilkash/Downloads/android-sdk-linux/platform-tools
Environment variables can be defined permanently by editing the .profile file in your home directory. Here's how:
Edit your .profile file with a command like gedit ~/.profile. Append this to the end of the file:
export ANDROID_SDK_HOME=/home/nilkash/Downloads/android-sdk-linux/platform-tools
You can source .profile to make it apply right away. Each time you restart your system, the .profile file is loaded, restoring this setting.
OR
This below method works 100% for me on Ubuntu 12.04:
Start the terminal
$gedit .bashrc
Add the below line at the enc of the file:
PATH=$PATH:/home/nilkash/Downloads/android-sdk-linux/platform-tools/
Note: gedit must be performed only on .bashrc and NOT on .bashrc~
Please do accept the answer if it works for you.