Configuring Eclipse and the Android SDK
With Eclipse, the Java JDK and the Android SDK tools all installed, you’re ready to proceed.
Open Eclipse and go to Help > Install New Software…, where you will see the Work with field. To the right of this, click Add and enter Android in the Name field and https://dl-ssl.google.com/android/eclipse/ for the location. Click OK to confirm this and the Developer tools option will be displayed – expand this, check all the boxes and click Next. Watch out for any on-screen instructions that need to be followed, and wait while the required tools are downloaded (for instance, you may need to restart Eclipse).
Next head to the Android SDK (you should have already unpacked and installed this) and run the SDK Manager, which you will be able to use to download a suitable package for Android development. In the Choose Packages to Install window, select SDK Platform Android 3.x, API XX (where the x and XX will denote the most up to date versions).
Accept the description and license, click Install and then sit back and wait as the Android SDK tools are downloaded.