Google: "unity3d android black screen"
Okay, i solved it and almost jumped through the roof when i realised i did. So heres how to fix black screen issue!
Go to "Edit -> Player -> Resolution/Presentation -> Disable "Use 32Bit Buffer" And "24Bit".
Go to "Edit -> Project Settings -> Here, disable Antialaising completely in every Quality Setting
For fun, heres the script for Quality Change pressing Button.
Edit: i fixed it. its working well now. Please make you sure 32-bit Display Buffer is checked in the Player Settings > Resolution and Presentation tab. Hope this helps :)