I got it work with a Roku 3. Slide down from the top of the screen and then slide the row of settings icons all the way to the left. Touch the Smart View icon. Connection will take place. Have screen mirroring turned on in Settings/System/Screen mirroring on the Roku. I have my Roku cable connected to my wireless router and my Tab A wifi connected to my router.

Check out this video I found in YouTube: click here

Hope that helps.