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No se pueden leer las propiedades de undefined (leyendo 'messageHandlers')" en Android

Esta es mi función javascript-

 function backHomePage(message){window.webkit.messageHandlers.backHomePage.postMessage(message);}

al final se llama backHomePage('popup');

Ahora, en mi aplicación de Android, quiero agregar esta función de JavaScript en mi JavascriptInterface.

He hecho el siguiente enfoque-

 override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) { super.onPageStarted(view, url, favicon) webview_.evaluateJavascript("window.webkit = { messageHandlers: { backHomePage: window.backHomePage('popup')} }") {} } webview_.addJavascriptInterface(WebAppInterface(this),"backHomePage") webview_.loadUrl(url)

y mi clase WebAppInterface es así:

 class WebAppInterface(private var mContext: Context) { fun WebAppInterface(c: Context) { mContext = c } @JavascriptInterface fun postMessage() { Log.d("tag", "postMessage message") }

Ahora no entiendo en qué cosa me estoy quedando atrás, ya que he hecho todo a mi entender. Alguien puede ayudarme porfavor?

about 4 years ago · Juan Pablo Isaza
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