webview加载时候弹出进度条

@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {// 网页页面开始加载的时候


if (progressDialog == null) {
progressDialog = new ProgressDialog(DetailActivity.this);
progressDialog.setMessage("数据加载中，请稍后。。。");
progressDialog.show();
webview.setEnabled(false);// 当加载网页的时候将网页进行隐藏
}
super.onPageStarted(view, url, favicon);
}


@Override
public void onPageFinished(WebView view, String url) {// 网页加载结束的时候
if (progressDialog != null && progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
webview.setEnabled(true);
}
}