直接上程式碼

    wb.loadUrl(url);
    wb.setBackgroundColor(0);
    wb.setWebChromeClient(new WebChromeClient(){
        @Override
public void onReceivedTitle(WebView view, String title) {
            super.onReceivedTitle(view, title);
        }
        @Override
public void onProgressChanged(WebView view, int 
 
newProgress) {
            super.onProgressChanged(view, newProgress);
           bar.setProgress(newProgress);
        }
    });
    wb.setWebViewClient(new WebViewClient(){
        @Override
public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
              bar
 
.setVisibility(View.INVISIBLE);
        }
    });
}