Android Question video player on android 9

hi..
I can't play video on android 9 device when I set target sdk 28.

The target is playing video on android 9 device when set to sdk 26.

The same goes for the exo player and video view.

https://... ----->> no problems with these videos.

http:// .... ------>> If the target sdk 28 in these videos does not run android 9 device. Android ...,6,7,8 devices running.

I added a sample project.

how do I make an arrangement.
thanks..