ASignature is a library for drawing smooth signatures. It uses variable width Bézier curve interpolation based on Smoother Signatures. It works from API 8+ and doesn't depend on any external libraries.
This plugin will scan and adapt your source files to include a provided header, e.g. a LICENSE file. By default it will scan every source set and report warnings. It will also create format tasks, which will properly format and apply the specified header.