Android based tv boxes

Could you be more specific?  TV attached interfaces or TVS? If interfaces,  why not use a casting solution?

The Android based box convert ordinary Tv to smart Tv with wifi,The Tv display is used as big tablet...most of the China company's are manufactures don't work for properly
Hence sourcing the design consultant.

You might need to create a Gig project to hire a consultant.

Your question will be answered here and you need to test it whether it works.

Solution to RCA VIDEO output prolem: Two steps
Step 1:Hardware setup,i,e whatever the rca cable you have bought mostly have the yellow pin with connections in reverse as per Rapberry pi requirement ,
       so you the cut yellow wire at distance of 10 cm from male pin and reverse the connection with black to yellow and yellow to black, now you are fit with RCA hardware                         compatability.
Step 2: If you connect Raspy to  tv powered on and then power on your raspy,if you dont see anything on tv (with AV screen on ,for which the Raspy has been connected)
          go for "config.txt" editing ,Add the folliwing lines of code, (note:if a line of code already exist dont repeat it)

The info above is about using Raspberry Pi to create a cheap computer with RCA output to old TVs.

Source: https://www.element14.com/community/thread/43364/l/raspberry-pi-2-av-output-via-rca-question?displayFullThread=true

Samsung Galaxy S1 is not expensive and can feed from USB and play on HDMI...

I 2nd the idea of the Raspberry Pi but it is now called Kodi
https://kodi.tv/
Kodi media center
https://kodi.tv/about/
A Step by Step Guide To KODI and Streaming Movies or TV Shows
http://www.wirelesshack.org/a-guide-to-kodi-and-watching-free-movies-and-tv-shows.html
Kodi Android apps on Google Play
Kodi® media center, formerly known as XBMC™ Media Center, is an award-winning free and open source cross-platform software media player and entertainment hub for digital media for HTPCs (Home theater PCs). It uses a 10-foot user interface designed to be a media player for the living-room, using a remote control as the primary input device. Its graphical user interface (GUI) allows the user to easily browse and view videos, photos, podcasts, and music from a harddrive, optical disc, local network, and the internet using only a few buttons.
https://play.google.com/store/apps/details?id=org.xbmc.kodi&hl=en
Build your own home media center: Get started with Kodi
http://www.cnet.com/au/news/how-to-set-up-a-home-media-center-with-kodi-xbmc/

You can run kodi on plain Pi Linux, no need for android at all.

Hi..
Thanks for advice,we all know more about Android & Windows..but Linux not much exposed.. please advise more on
PI LINUX..it is software to installed on what hardware & Kodi build is to downloaded?
Then it is to be connected to HDMI of TV?

If your TV has USB port, I think you are practically all set up 1h after Pi is delivered....
https://www.raspberrypi.org/documentation/usage/kodi/README.md

My Raspberry has Raspian installed it is an older pi2 raspbmc with openELEC
I bought a rubber keyboard and several sd cards with a USB stick and a hdmi cable audio cable. and a power cable.
 Install it to the sim card using your windows. Then install the new Kodi media center
The Pi plugs it into my TV HDMI and audio into the audio in, I use it mainly to play MP4 from a USB stick
Otherwise I just use my WD USB drive with divx avi works just fine  plug the USB drive into the TV put the onto apps then select  Video.
My Pi  is a few years ago it now has a case.

I have attached my saved word DOC Configuring Raspbian on Your Pi old version I guess
Raspbian is the Foundation’s official supported Operating System. Download it here, or use NOOBS, our easy installer for Raspbian and more.
https://www.raspberrypi.org/downloads/
You should now be able to buy the Rasp Pi box complete with all accessories including a case and remote control cables
I dont like to post URL for Ebay as they expire so be quick and have a look at this one
Raspberry-Pi-3-KODI-DVB-T-Media-Bundle-RPi3B356
http://www.ebay.com.au/itm/Raspberry-Pi-3-KODI-DVB-T-Media-Bundle-RPi3B356-/331418610279
here's another not on Ebay includes the case
https://wiltronics.com.au/product/9077/raspberry-pi-3-model-b-kodi-dvb-t-digital-radio-media-pack/
On Amazon
https://www.amazon.com/Raspberry-Pi-Based-Extreme-Center/dp/B00TRN8X4G

for the latest this will help you
In this updated guide, you will learn how to set up Raspberry Pi 3 as a complete Kodi (was XBMC) entertainment center solution with the right accessories.
http://mymediaexperience.com/raspberry-pi-xbmc-with-raspbmc/

all the best
Configuring-Raspbian-on-Your-Pi.doc

As a matter of fact.