@Override
        public View getVideoLoadingProgressView() {
            if (webChromeClient != null) {
                return webChromeClient.getVideoLoadingProgressView();
            }
            return super.getVideoLoadingProgressView();
        }
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