在Android中，当WebView加载URL时，如何显示进度条？

尝试此代码…您需要webChoromeClient来跟踪webview加载进度…

webView.setWebChromeClient(new WebChromeClient() {public void onProgressChanged(WebView view, int progress) {    progressBar.setProgress(progress);    if (progress == 100) {        progressBar.setVisibility(View.GONE);    } else {        progressBar.setVisibility(View.VISIBLE);    } }});

用此代码替换您的webview客户端。

private class MyWebViewClient extends WebViewClient {@Overridepublic boolean shouldOverrideUrlLoading(WebView view, String url) {    view.loadUrl(url);    return true;   }}