Android button handler

button.java

   private void onButtonClick(EmbeddedAppButton button) {
        if (button.hasRoutableHref()) {
            Router.getInstance().launch(getShopifyActivity(), button.getHref());
        } else {
            String script = "this[\"__extension\"].send(\"" + button.getPostMessage() + "\");";
            webView.evaluateJavascript(script, value -> {});
        }
    }