Google’s Android team recently released the ADT Bundle which provides everything you need to develop with the Android SDK including a version of the Eclipse IDE with a built in ADT (Android Developer Tools) plugin. This greatly simplifies setting up an Android developer environment.
Eclipse 3.8 and 4.2 were released concurrently as part of the Juno release. The Android team uses the 3.8 platform which is just the core and not a full packaged release. Features and plugins can be added from within the IDE. The Android team bundles the ADT in this fashion. You can install and develop with the ArcGIS Runtime SDK for Android v10.1.1 and the ADT bundle in the same way you would install and develop with a supported Eclipse platform. When installing features and plugins into the IDE Eclipse will contact all update sites during install to find any required software needed for the plugins. Since 3.8 is part of the Juno release it checks Juno repository during this process and will update the platform to 4.2. This results in ADT bundle branding and appearance to be overridden by Eclipse Juno. In order to keep the ADT branding you must make sure that the installer dialog checkbox for ‘Contact all update sites during install to find required software’, is not selected as shown below:
You can track this issue with Android.