ADT NEW PLUGIINNS...........

Downloading the ADT Plugin

Use the Update Manager feature of your Eclipse installation to install the latest revision of ADT on your development computer.<>

Assuming that you have a compatible version of the Eclipse IDE installed, as described in Preparing for Installation, above, follow these steps to download the ADT plugin and install it in your Eclipse environment.

1. Start Eclipse, then select Help > Install New Software....
2. Click Add, in the top-right corner.
3. In the Add Repository dialog that appears, enter "ADT Plugin" for the Name and the following URL for the Location:

   https://dl-ssl.google.com/android/eclipse/

4. Click OK
   Note: If you have trouble acquiring the plugin, try using "http" in the Location URL, instead of "https" (https is preferred for security reasons).
5. In the Available Software dialog, select the checkbox next to Developer Tools and click Next.
6. In the next window, you'll see a list of the tools to be downloaded. Click Next.
7. Read and accept the license agreements, then click Finish.
   Note: If you get a security warning saying that the authenticity or validity of the software can't be established, click OK.
8. When the installation completes, restart Eclipse.

Configuring the ADT Plugin

After you've successfully downloaded the ADT as described above, the next step is to modify your ADT preferences in Eclipse to point to the Android SDK directory:

1. Select Window > Preferences... to open the Preferences panel (Mac OS X: Eclipse > Preferences).
2. Select Android from the left panel.
You may see a dialog asking whether you want to send usage statistics to Google. If so, make your choice and click Proceed. You cannot continue with this procedure until you click Proceed.
3. For the SDK Location in the main panel, click Browse... and locate your downloaded SDK directory.
4. Click Apply, then OK.

Done! If you haven't encountered any problems, then the installation is complete. If you're installing the Android SDK for the first time, return to Installing the SDK to complete your setup.

You can ADT 12.0 bu using this app

http://developer.android.com/sdk/eclipse-adt.html

If you all ready have ADT Installation in eclipse try to update by using fallowing Data 

Updating the ADT Plugin

From time to time, a new revision of the ADT Plugin becomes available, with new features and bug fixes. Generally, when a new revision of ADT is available, you should update to it as soon as convenient.

In some cases, a new revision of ADT will have a dependency on a specific revision of the Android SDK Tools. If such dependencies exist, you will need to update the SDK Tools component of the SDK after installing the new revision of ADT. To update the SDK Tools component, use the Android SDK and AVD Manager, as described inAdding SDK Components.

To learn about new features of each ADT revision and also any dependencies on the SDK Tools, see the listings in the Revisions section. To determine the version currently installed, open the Eclipse Installed Software window using Help > Software Updates and refer to the version listed for "Android Development Tools".

Follow the steps below to check whether an update is available and, if so, to install it.

1. Select Help > Check for Updates.
   If there are no updates available, a dialog will say so and you're done.
2. If there are updates available, select Android DDMS, Android Development Tools, and Android Hierarchy Viewer, then click Next.
3. In the Update Details dialog, click Next.
4. Read and accept the license agreement and then click Finish. This will download and install the latest version of Android DDMS and Android Development Tools.
5. Restart Eclipse.