Sorted out the last issue, that was my mistake 
What I currently struggle with is the ue4 function on my android phone, I’ve applied the JS required to make it work however it only works on websites on the internet / local webservers where there is a proper URL, it does not work for me when loading the HTML directly or loading a local file.
I’ve tried quite a lot, but it only returns undefined and no communication to UE4 is being picked up, I’ve applied events to both the interface and the URLchange and none of them trigger.
It’s using Android Webview 52