"Designing For Android: Tips And Techniques" is an in depth blog post with many best practices when designing for Android. Especially when you have to design for multiple resolutions.
In this blog post Jernej Virag explains all the must have libraries a Android developer should know. Very similiar to our toolbox, but great summaries and explanations of each library.
Maven and Android series
Sixth part of Mark Allisons "Maven and Android" series.
Synchronized Scrolling Library
Synchronized Scrolling by Xavi Rigua is a library project that allows you to have a Synchronized scrolling effect in a view, similar to the one in the GMail app (when you open a conversation with multiple messages, you can scroll down and the senders info stay on top of screen).
Sergey Tarasevich has a library on Github that helps you to share your content in Facebook or Twitter.
Universal Image Loader (also by Sergey Terasevich) is a reusable and powerful component for asynchronous image loading, caching and displaying.
An official writing style guide has been released by Google. Most of it is common sense, but it is a good nudge to revisit your copy.
Let's face it: Juggling with densities for Android is a bit of a pain, especially when dealing with 9 patch png. And then comes this tool, that takes a xhdpi PNG file, or 9.png file, and generates ldpi, mdpi and hdpi png files automatically. Great work!
Three Upcoming Android Development Contests
Android development contests are an excellent opportunity to showcase your design and development talents. In this blogpost Michelle Greenline lists three of them.