Android source code to communicate via BLE to modify for my application

[jerry]

Hi I have a product that uses an Nrf52810 in a Raytec slave module. I am able to successfully send and receive packets of data using  your UART app in the nrf Toolbox

I would like to develop a custom Android phone app using a Windows 10 PC, as a cross compiler.. What source code should I download from Github and what platform does it run on(Android Studio or VS?)

Basically I need a driver for the communications in order send and receive data. ,

Thanks

Jerry

[jerry]

i get this error 

import android.support.v4.content.LocalBroadcastManager;

LocalBroadcastManager doesnt't exist