questionEditor = (WebView) findViewById(R.id.textfieldQuestion);

    questionEditor.setWebViewClient(new WebViewClient() {
        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
            questionEditor.loadUrl("javascript:disableAllButtons();");
        }
    });

    questionEditor.getSettings().setJavaScriptEnabled(true);
    questionEditor.loadUrl("file:///android_asset/ckeditor/myeditor.html");
    questionEditor.addJavascriptInterface(
            new BYGetHtmlFromEditorJavaScriptInterface(questionEditor
                    .getContext(), this), PRE_JAVASCRIPT_INTERFACE);

function disableAllButtons(isPremium) {

var editor_t = CKEDITOR.instances['by_textfield'];
var toolbar_lenght = editor_t.toolbox.toolbars.length;
for (i = 0; i < editor_t.toolbox.toolbars.length; i++) {
    var items_lenght = editor_t.toolbox.toolbars[i].items.length;
    for (j = 0; j < items_lenght; j++) {
        button = editor_t.toolbox.toolbars[i].items[j].button;
        button.setState(0);
        button.setState = function() {
        };
        button.click = function() {
        };
    }
}
}