Is it a good idea to use Google Guava library for Android development?
(Too big for comment, so I post an answer.) Personally I use whole Guava library in every Java project and when I don't have significant and properly profiled performance problems. If you do have, for example, memory concerns like in Android environment, you can use ProGuard to get only these parts of Guava you really need.
Moreover, there are many Android apps using Guava - not only small ones, i.e. Google Search and Youtube, which directly come from Google.
(You should also see compatibility note.)