ProgressButton

ProgressButton is a custom progress indicator with a tiny footprint. Based on the sample code provided by Roman Nurik on Google Code. The default implementation provides a pin progress button as seen on the Android design site.
The color indicates whether it’s downloaded (blue) or not (gray). The appearance of the pin indicates whether the download is permanent (white, upright) or temporary (gray, diagonal). When state is in the process of changing, progress is indicated by a moving pie chart