I think Google prefers to support existing open source projects that are successful. Internally, a lot of Java engineers at Google use Eclipse, which is a great IDE for Java development. No need to re-invent the wheel, instead it makes more sense for them to contribute to the success of Eclipse.
Because you can already develop Android apps quickly and efficiently with a number of already built and well supported IDEs? It makes no sense to spend money on something for a niche thing like Android development.
6 comments
[ 4.9 ms ] story [ 30.5 ms ] threadFYI, Google also just donated $20K to the Eclipse foundation: http://www.thepowerbase.com/2012/09/google-donates-20000-to-...
Also http://developer.android.com/sdk/index.html
For those who hasn't heard, this post is from Bram himself: http://gmailblog.blogspot.com/2010/08/new-in-labs-find-docs-... He seems to work for Gmail.