The latest Roku for Android app allows video as well as audio and photos to be streamed to a Roku set-top box – but only for a limited number of devices.
Play your video from select Android devices to your Roku player. Supported models include: Samsung Galaxy SIII, Samsung Galaxy S4, Nexus 4, HTC One, and Nexus 7 (2012 model). Video playback requires Android 4.0 or later …
The feature is supported on the Roku 2, Roku 3, Roku LT, Roku HD and Streaming Stick running software version 5.1 or higher. The same functionality was added to the iOS app last month.
Roku for Android 2.3 can be downloaded from Google Play.