One theme of Programming Android is that Android is now client Java. Client Java is what every Java coder started with when they start learning Java, but then, when it gets down to working for a living, it's all server Java now. So you have millions of coders who are primed for a successful client Java, and many of them work in enterprise IT. How will Android impact the work of Java coders?
The Android SDK is open source and developed transparently. Although not well known, this is just the tip of the iceberg. There is a huge variety of development, test and build tools available. You can reuse some existing Java libraries and will find that more and more Android specific libraries are being created and used. Get a good overview and see what the future might bring.