@Override
                    public void onClick(DialogInterface dialog, int which) {
                        if (alertboxBlock) {
                            if (which == Dialog.BUTTON_POSITIVE) {
                                result.confirm(editText.getText().toString());
                            } else {
                                result.cancel();
                            }
                        }
                    }
This method can be called in any thread, and if it is not called in the main thread,
it will be automatically distributed to the main thread.

@param url
@param additionalHttpHeaders
app/src/main/java/com/example/jingbin/webviewstudy/view/WVJBWebView.java