Use Android AccessibilityService with nativescript - nativescript

Question

Currently I make myself familiar with nativescript and trying to figure out what you can do with it. One thing that I find very interesting and for which I am more interested in is how I can use native Android functions.
As challenge for understanding and learning I have picked out the possibility in apps fill in text fields with specific values like some password managers apps do. If I understand it right, it shouldn't big voodoo.
How, I found two examples. The first one is the autofill feature from the keepass2android app. Sources: https://keepass2android.codeplex.com/SourceControl/changeset/view/9ddc142d987880118be38ee1d69943f2809738d3#src/java/KP2ASoftkeyboard_AS/app/src/main/java/keepass2android/autofill/AutoFillService.java
Other sample I found here: AccessibilityNodeInfo - send text
First quick and dirty I hack the app.js, find out how the android native functions works in nativescript. So I want trigger somehow the different events but only init is triggered (so far I also understand it also).
var applicationModule = require("application");
var platform = require("platform");
var context = applicationModule.android.context;
android.accessibilityservice.AccessibilityService;
var aa = android.accessibilityservice.AccessibilityService.extend({
init: function() {
console.log("init()");
},
onInit: function() {
console.log("onInit()");
},
create: function() {
console.log("create()");
},
onCreate: function() {
console.log("onCreate()");
},
destroy: function() {
console.log("destroy()");
},
onDestroy: function() {
console.log("onDestroy()");
},
accessibilityEvent: function(event) {
console.log("accessibilityEvent");
},
onAccessibilityEvent: function(event) {
console.log("onAccessibilityEvent");
},
interrupt: function() {
console.log("interrupt");
},
onInterrupt: function() {
console.log("interrupt");
},
serviceConnected: function() {
console.log("serviceConnected");
},
onServiceConnected: function() {
console.log("onServiceConnected");
}
});
var a = new aa();
Probably android.accessibilityservice.AccessibilityService must somehow be extended in a different way, get it working. But how?
It would be a big deal if the onAccessibilityEvent function would be triggered in nativescript.
Edit:
I made some progress. Found some other nativescript sources and samples and modified my code. Now:
var applicationModule = require("application");
var platform = require("platform");
var utils = require("utils/utils");
var context = android.content.Context;
var ad = utils.ad.getApplicationContext();
var aa = ad.getSystemService(context.ACCESSIBILITY_SERVICE);
But the way, I can register onAccessibilityEvent is currently not clear for me.

Answer 1

You need to register your service (the class from your first code block) similar to this example:
http://developer.android.com/training/accessibility/service.html
and place your logic in onAccessibilityEvent override.