@TargetApi(Build.VERSION_CODES.LOLLIPOP)
        @Override
        public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback,
                                         FileChooserParams fileChooserParams) {
            if (webChromeClient != null) {
                return webChromeClient.onShowFileChooser(webView, filePathCallback, fileChooserParams);
            }
            return super.onShowFileChooser(webView, filePathCallback, fileChooserParams);
        }
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