The grander plan is then to connect the Roku to the cabin TV on my 2 week Hawaiian cruise (8 days at sea), and stream AndroidTV content directly to it. Add the battery, and now you don't have to find a power outlet or have to gain access to anybody elses network. Like if you wanted to take the rig to a friends house or party, or bring and connect to a projector. You really shouldn't have to involve a router unless you need to get to the internet (maybe a good reason for using the android hotspot mode some how). If your content is otherwise just on your phone, www isn't needed.
This setup makes a better experience than trying to use the mini hdmi port on my samsung galaxy s2 with an adapter. Please let me know what you think. THANKS!!!