ShapeOfView
Give a custom shape to any android view, Material Design 2 ready
...Rather than sticking to Android’s default rectangular layout for views, ShapeOfView allows you to “clip” or mask a view into a variety of shapes (circle, triangle, star, polygon, custom path, etc.), and optionally include shadows (when using elevation) — making it possible to build UI components that diverge from the standard boxy look. It supports both predefined shapes (round rects, circles, arcs, bubbles, triangles, stars, polygons, diagonals, cut corners) and fully custom shapes via clipping paths or drawables. Moreover, shapes can be animated (for example, corners gradually changing, or shape morphing), giving developers creative freedom for dynamic UI effects. ...