Picasso is an open source powerful and dynamic image caching and downloading library by Square.
Working with bitmaps can be hard on Android apps. There are too many things that can go wrong. The golden rule is decode only as much as you need, never more. Picasso is the realization of this rule by Square.
With automatic canceling, transformations and a fluent API, Picasso provides a super fast, elegant solution for downloading, caching and displaying images to your Android app.
Official Site: http://square.github.io/picasso/