Android仿微信公众号文章页面加载进度条

@SuppressWarnings("deprecation")
public class ProgressWebView extends WebView {

 private ProgressBar progressbar;

 public ProgressWebView(Context context) {
  super(context);
  init(context);
 }

 private void init(Context context) {
  progressbar = new ProgressBar(context, null,
    android.R.attr.progressBarStyleHorizontal);
  progressbar.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
    6, 0, 0));
  progressbar.setProgressDrawable(this.getResources().getDrawable(
    R.drawable.btn_progress_webview));
  addView(progressbar);
  setWebChromeClient(new WebChromeClient());
 }

 public ProgressWebView(Context context, AttributeSet attrs) {
  super(context, attrs);
  init(context);
 }

 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);
 }
}

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

 <!-- 设置背景色（黑色） -->
 <item android:id="@android:id/background">
  <shape>

   <!-- 进度条的四个棱角大小 0 为都是直角 随着值的增大角越圆滑 -->
   <corners android:radius="0dip" />

   <gradient
    android:endColor="#c0c0c0"
    android:startColor="#c0c0c0" />
  </shape>
 </item>

 <!-- 设置进度条颜色（绿色） -->
 <item android:id="@android:id/progress">
  <clip>
   <shape>
    <corners android:radius="0dip" />

    <gradient
     android:endColor="#a13864"
     android:startColor="#a13864" />
   </shape>
  </clip>
 </item>

</layer-list>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.summer.progresswebview.MainActivity" >

 <com.summer.progresswebview.ProgressWebView

  android:id="@+id/progresswebview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"/>

</RelativeLayout>

public class MainActivity extends Activity {
 private ProgressWebView progresswebview;

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

 private void initView() {
  progresswebview = (ProgressWebView) findViewById(R.id.progresswebview);
  progresswebview.getSettings()
    .setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
  progresswebview.getSettings().setJavaScriptEnabled(true);
  progresswebview.getSettings().setSupportZoom(true);
  progresswebview.getSettings().setLoadWithOverviewMode(true);
  progresswebview.getSettings().setUseWideViewPort(true);
  progresswebview.setVerticalScrollBarEnabled(false);
  progresswebview.setHorizontalScrollBarEnabled(false);// 水平不显示

  progresswebview.getSettings().setBuiltInZoomControls(true); // 支持页面放大缩小按钮
  progresswebview.setWebViewClient(client);
  progresswebview.loadUrl("https://www.baidu.com/"); // 加载百度首页网址
 }

private WebViewClient client = new WebViewClient() {

  @Override
  public void onPageFinished(WebView view, String url) {
   super.onPageFinished(view, url);
   progresswebview.getSettings().setLoadsImagesAutomatically(true);
  }

  @Override
  public void onPageStarted(WebView view, String url, Bitmap favicon) {
   super.onPageStarted(view, url, favicon);
  }


  public boolean shouldOverrideUrlLoading(WebView view, String url) {

    //调用拨号程序 
   if (url.startsWith("mailto:") || url.startsWith("geo:") ||url.startsWith("tel:")) { 
    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
    startActivity(intent); 
   }else
    view.loadUrl(url);


   return true;
  }

  public void onReceivedError(WebView view, int errorCode,
    String description, String failingUrl) {

  }

 };

}