The first thing you need to do is install the Android SDK. This is the same as the Java SDK you also need to have installed.
1. To obtain the android SDK go to: http://developer.android.com/sdk/index.html
2. Download the bundle
3. When it is downloaded move it to somewhere you are not going to delete it. I put mine in the “IdeaProjects” as this is where all of your projects a going to be saved, therefore I’m unlikely to delete it when placed within there.