Wrapper for a webview that handles JSONs, invoking a callback when encountering them

JsonWebview.kt

class JsonWebView(private val webView: WebView) {
    private val BASEURL: String = BackendRemote.SERVER_ADDRESS
    val TAG = JsonWebView::class.java.name

    @SuppressLint("SetJavaScriptEnabled")
    fun loadURL(url:URL,cb: (JSONObject) -> Unit) {
        webView.settings.apply {
            javaScriptEnabled = true
            domStorageEnabled = true
            webView.loadUrl(url.toString())
        }
        // Creates a js interface method, callabale from the webview
        webView.addJavascriptInterface(
                object {
                    @JavascriptInterface
                    fun parseJSON(html: String) {
                        Log.d(TAG, "Injected $html")
                        try {
                            val obj = JSONObject(html)
                            Log.d(TAG, "valid json obj from $html : $obj")
                            cb(obj["api_key"] as String)
                        } catch (ex: JSONException) {
                            Log.d(TAG,"Invalid json")
                        }
                    }
                },
                "JSONHandler" // interface name for url calling
        )
        webView.webViewClient = object : WebViewClient() {
            private val TAG = "${OAuthHandler::TAG}::WEBVIEW"
            override fun onPageFinished(view: WebView?, url: String?) {
                Log.d(TAG,"PAGE FINISHED")
                //Call the js interface
                view?.loadUrl("javascript:window.JSONHandler.parseJSON(document.body.innerText);")
                super.onPageFinished(view, url)
            }
        }
    }
}