android - Adding loading spinner on Action Bar while the WebView loads? -

i developing android app. using webview render html page stays blank while page loads. want add loading spinner in action bar user knows loading , not blank.

please can guide me how that.

my existing code -

package com.pranavsethi.dpsrkp;  import android.annotation.targetapi; import android.app.actionbar; import android.app.activity; import android.content.intent; import android.net.uri; import android.os.build; import android.os.bundle; import android.view.keyevent; import android.view.menu; import android.view.menuinflater; import android.view.menuitem; import android.webkit.downloadlistener; import android.webkit.webview; import android.webkit.webviewclient;   public class achievements extends activity{      private webview mwebview;       @targetapi(build.version_codes.honeycomb)     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.webvew_client_layout);         actionbar actionbar = getactionbar();         actionbar.setdisplayhomeasupenabled(true);           //for web view          mwebview = (webview) findviewbyid(r.id.webview);         mwebview.getsettings().setjavascriptenabled(true); //enable javascript         mwebview.getsettings().setbuiltinzoomcontrols(true);  //enable zoom         mwebview.getsettings().setdisplayzoomcontrols(false);         mwebview.getsettings().setloadwithoverviewmode(true);           mwebview.getsettings().setusewideviewport(true);            mwebview.setscrollbarstyle(webview.scrollbars_outside_overlay);            mwebview.setscrollbarfadingenabled(true);            mwebview.setdownloadlistener(new downloadlistener() {             @override             public void ondownloadstart(string url, string useragent,                     string contentdisposition, string mimetype,                     long contentlength) {                 // handle download, here use brower download, can try other approach.                 uri uri = uri.parse(url);                 intent intent = new intent(intent.action_view, uri);                 startactivity(intent);             }         });         mwebview.loadurl("http://pranavsethi.tk");  // name of website load         mwebview.setwebviewclient(new hellowebviewclient());   //removing loading progressbar   }       private class hellowebviewclient extends webviewclient{    //our web client          @override             public void onreceivederror(webview view, int errorcode,                //code checking internet connection , return error if fails                     string description, string failingurl) {              intent intent = new intent(achievements.this, mainactivity.class);                intent.addflags(intent.flag_activity_clear_top);                 startactivity(intent);                    return;               }               @override         public boolean shouldoverrideurlloading(webview webview, string url)         {             webview.loadurl(url);             return true;          }     }      @override     public boolean onkeydown(int keycode, keyevent event)     {         if ((keycode)== keyevent.keycode_back && mwebview.cangoback())            {             mwebview.goback();             return true;          }         return super.onkeydown(keycode, event);     }      @override     public boolean oncreateoptionsmenu(menu menu) {          return true;     }       @override     public boolean onoptionsitemselected(menuitem item)       {        switch (item.getitemid())         {          case android.r.id.home:             intent intent = new intent(this, mainactivity.class);             intent.addflags(intent.flag_activity_clear_top);             startactivity(intent);             overridependingtransition  (r.anim.right_slide_in, r.anim.fade_out);             break;               default:             return super.onoptionsitemselected(item);          }     return true;       }      @override     public void onbackpressed()      {         this.finish();         overridependingtransition  (0, r.anim.right_slide_out);         return;     }     } 

solution

add following -

requestwindowfeature(window.feature_indeterminate_progress); setprogressbarindeterminatevisibility(true);  

after -

super.oncreate(savedinstancestate); 

and in webviewclient

private class hellowebviewclient extends webviewclient{        @override     public boolean shouldoverrideurlloading(webview webview, string url){             webview.loadurl(url);             setprogressbarindeterminatevisibility(true);                             return true;          }              @override                 public void onpagefinished(webview webview, string url){                     super.onpagefinished(webview, url);                     setprogressbarindeterminatevisibility(false);                  }     }