P1: Critical No networking examples with Qt Quick seems to work for me with 5.4 beta.
I have created a minimum example below that simply tries to GET www.google.com and see if you get a reply. To reproduce just create a new project, add the manifest and add the "android.permission.INTERNET" permission. This works perfectly well on 5.3.2 but never responds in 5.4 beta. If there are changes I need to make this work, that should be documented somewhere. If not, I think you have a pretty big showstopper on your hands... 
import QtQuick 2.3 import QtQuick.Window 2.2 Window { id: window visible: true width: 640 height: 480 Text { id: label anchors.centerIn: parent font.pixelSize: 30 text: "Waiting..." } Component.onCompleted: { var req = new XMLHttpRequest (); req.open ('GET', 'http://www.google.com/', true); req.onreadystatechange = function (aEvt) { if (req.readyState == 4 && req.status == 200) { label.text = "We got a reply!" window.color = "lightgreen" } }; req.send(); } }