From Roku Technologies:
Our free app lets you browse and add channels from more than 1,000 Roku channels offered in the Roku Channel Store. Enjoy your Android device's photos, music, and video on your Roku player (Supported on Roku 3, Roku 2, Roku LT, Roku HD (model 2500) and Roku Streaming Stick only). You can quickly launch and rate your Roku channels and take command of your Roku player with a remote control. The app includes instant replay, back and options buttons,
the ability to enter text using you device's keyboard, name and switch between multiple Roku players and more.
This app requires a Roku player and a Roku account. To get started, you must connect your Android device to the same network as your Roku player. You will be asked to sign-in to your Roku account and connect to your Roku player over your home network.