Honeycomb adds new animation support, and ADT has preliminary support for animation playback. If your project contains new animation resources (in the res/animator folder) then these are all displayed in the "Run Animation" context menu, and selecting an animation will apply the animation to the selected object (the one you right clicked on to bring up the context menu), and the animation will play once. This lets you preview and tweak your animations before trying them out on a device or in the emulator.