Android 带进度条的WebView 示例代码

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/**
 * 带进度条的WebView
 * http://www.cnblogs.com/over140/archive/2013/03/07/2947721.html
 * 
 */
@SuppressWarnings("deprecation")
public class ProgressWebView extends WebView {

 private ProgressBar progressbar;

 public ProgressWebView(Context context, AttributeSet attrs) {
  super(context, attrs);
  progressbar = new ProgressBar(context, null, android.R.attr.progressBarStyleHorizontal);
  progressbar.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, 3, 0, 0));
  addView(progressbar);
  //  setWebViewClient(new WebViewClient(){});
  setWebChromeClient(new WebChromeClient());
 }

 public class WebChromeClient extends android.webkit.WebChromeClient {
  @Override
  public void onProgressChanged(WebView view, int newProgress) {
   if (newProgress == 100) {
    progressbar.setVisibility(GONE);
   } else {
    if (progressbar.getVisibility() == GONE)
     progressbar.setVisibility(VISIBLE);
    progressbar.setProgress(newProgress);
   }
   super.onProgressChanged(view, newProgress);
  }

 }

 @Override
 protected void onScrollChanged(int l, int t, int oldl, int oldt) {
  LayoutParams lp = (LayoutParams) progressbar.getLayoutParams();
  lp.x = l;
  lp.y = t;
  progressbar.setLayoutParams(lp);
  super.onScrollChanged(l, t, oldl, oldt);
 }
}
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public class WebActivity extends BaseActivity {

 private ProgressWebView webview;
 private String url;
 private String name;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.commom_web);

  // ~~~ 获取参数
  url = getIntent().getStringExtra("url");
  name = getIntent().getStringExtra("name");

  // ~~~ 绑定控件
  webview = (ProgressWebView) findViewById(R.id.webview);

  // ~~~ 设置数据
  titleText.setText(name);
  webview.getSettings().setJavaScriptEnabled(true);
  webview.setDownloadListener(new DownloadListener() {
   @Override
   public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
    if (url != null && url.startsWith("http://"))
     startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
   }
  });

  webview.loadUrl(url);
 }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >

 <include layout="@layout/include_title" />

 <com.nmbb.ui.widget.ProgressWebView
  android:id="@+id/webview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" />

</LinearLayout>