Recognizing that fragmentation of the Android platform frustrates consumers and developers alike, Google is looking to put a stop to it.
The company has modified its legal agreement with developers working on Android apps to specifically prohibit them from any action that could contribute to further fragmentation of the mobile platform. The anti-fragmentation clause was recently added to the Android SDK licensing terms and conditions, which developers must accept in order to build Android apps.
Section 3.4 of Google's new terms, which were updated Tuesday, reads, "You agree that you will not take any actions that may cause or result in the fragmentation of Android, including but not limited to distributing, participating in the creation of, or promoting in any way a software development kit derived from the SDK."
The new clause is the first significant update since the 2009 terms, which did not address the issue of fragmentation.

Source: http://news.cnet.com/8301-1023_3-57550824-93/google-modifies-android-sdk-to-battle-platform-fragmentation/