Download and unpack the Android SDK, move it to your home folder. I prefer to set a point in front of the directory folder to make it be hidden so that my home directoy still looks tidy: .android-sdk-linux. Then add this to your path:

export PATH=${PATH}:~/.android-sdk-linux/tools:~/.android-sdk-linux/platform-tools

.android-sdk-tools is for running android command, and .android-sdk-tools/platform-tools is for running adb command And add it to your .bashrc-file so that this path is loaded automatically when you log on.

Smashing magazine has a pretty good tutorial how to start programming for android using git, github, eclipse and datastorage. I recommend: Get Started Developing For Android With Eclipse, Reloaded

If there are new classes or files in the project (say you have got the latest version from github into existing workspace in Eclipse). In order for Eclipse to see them, right click on the package and press “Refresh”.