Shimmer for Android

What this post added

This post introduces Shimmer for Android, a new component that provides a shimmering loading effect for Android views. It is implemented as a layout (`ShimmerFrameLayout`) that can wrap complex views and animate an alpha mask across them to create the effect. The implementation details include rendering the view twice with an alpha mask translation and allowing configuration via XML or programmatically. Shimmer is used in several Facebook applications for loading status indicators.