She said Android Studio 2.0 is 2x to 2.5x faster for building code (for a full build), while incremental builds can be up to 50x faster.

If you followed along in Part 2, you’ve already loaded your source code and resource files into your Android Studio project. Now you’re ready to build the app for the first time.

The Dalvik and ART runtime environments can compile that Java bytecode to run on any one of several processor architectures, so developers can write code once that will run on Android devices ...