android - Add a Progress Bar in WebView -

i trying add progress/loading bar application uses webview. confused on how implement progress bar appears every time link clicked.

current code:

public class culearnbrowser extends activity {      webview webview;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);         webview = (webview) findviewbyid(r.id.webview);         webview.setwebviewclient(new hellowebviewclient());         webview.getsettings().setjavascriptenabled(true);         webview.loadurl("https://culearn.colorado.edu/webct/entrypageins.dowebct");     }      private class hellowebviewclient extends webviewclient {         @override         public boolean shouldoverrideurlloading(webview view, string url) {             view.loadurl(url);             return true;         }     }      public boolean onkeydown(int keycode, keyevent event) {         if ((keycode == keyevent.keycode_back) && webview.cangoback()) {             webview.goback();             return true;         }         return super.onkeydown(keycode, event);     } } 

activity layout:

<?xml version="1.0" encoding="utf-8"?>  <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent">      <webview  xmlns:android="http://schemas.android.com/apk/res/android"         android:id="@+id/webview"         android:layout_width="fill_parent"         android:layout_height="fill_parent" />      <textview           android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:text="@string/hello" /> </linearlayout> 

this link may you.

i have added few lines in code , working fine progress bar.

        getwindow().requestfeature(window.feature_progress);         setcontentview(r.layout.main );         // makes progress bar visible         getwindow().setfeatureint( window.feature_progress, window.progress_visibility_on);          webview = (webview) findviewbyid(r.id.webview);         webview.setwebchromeclient(new webchromeclient() {             public void onprogresschanged(webview view, int progress)                {                 //make bar disappear after url loaded, , changes string loading...                 settitle("loading...");                 setprogress(progress * 100); //make bar disappear after url loaded                  // return app name after finish loading                 if(progress == 100)                    settitle(r.string.app_name);                 }             });         webview.setwebviewclient(new hellowebviewclient());         webview.getsettings().setjavascriptenabled(true);         webview.loadurl("http://www.google.com");