I\'m trying to use the youtube iframe player inside an android WebView but it fails on android 4.x while on 5.x everything works great.
When I try it in 4.x the player l         
        
I had the same problem, but after fighting with this long time, i didn't find a solution. I tested all the configurations with webview and did many different html changes to put the iframe.
After my researching i only can add:
In Android 4 versions, can't autoplay. The user has to press play button into the iframe to start play the video. Particularly:
From Android 5 and + everything works fine.
Good luck and I plus vote this question to know if anyone can put light into this question :)