Turn off screen but still let video and streams running Sometimes, I want to listen to streams or videos while I'm on the go, but I can't put my phone in my pocket because that would press buttons on the display. Is there any way to turn the screen off and still let the stream/video running like it does with music players?
Download MX Player
Play YouTube/Sdcard video using MX Player.
Press Menu button (or the 3 dot icon), and then select Play
Make sure "Background Play" is checked
Now, you can press Home Button and listen in lock screen.


There is also a shortcut for enabling Background Play, which is tapping and holding the Play button, instead of just tapping it to play a video

Update:


  Only For Rooted:
  You can install Xposed Modules Installer and use Repository called Youtube Background Play



Copied from my own answer on this post