3rd party links used in exo player by firebase

I want to create an online music player of religious players. there are so many application which based kn same idea but i want to use links to play a music which is fetched from website directly and links will be fetched from firebase but i am unable to fetch data from firebase for exo player kindly tell the solution its an initiative for needy kids education.

First of all this is illegal to use other’s music to your application, but if you want this for personal use then you can see a tutorial which I already made
A video tutorial in Hindi

Hope this help you