java - Unable to show interstitial ads with admob in andengine -

i have been trying show interstitials in andengine developed game unable to. have integrated banner ads though. prefer using coding layout. below gameactivity.java , gamescene.java classes, please in understanding root error?

public class gameactivity extends basegameactivity {     private smoothcamera camera;     public music music;`      public static int flag=0;       @override     public engine oncreateengine(engineoptions pengineoptions)      {         return new limitedfpsengine(pengineoptions, 60);     }      public engineoptions oncreateengineoptions()     {         camera = new smoothcamera(0, 0, 720, 1280,5000000,5000000,1);         engineoptions engineoptions = new engineoptions(true, screenorientation.portrait_fixed, new fillresolutionpolicy(), this.camera);         engineoptions.getaudiooptions().setneedsmusic(true).setneedssound(true);         engineoptions.getrenderoptions().getconfigchooseroptions().setrequestedmultisampling(true);         engineoptions.setwakelockoptions(wakelockoptions.screen_on);         engineoptions.gettouchoptions().setneedsmultitouch(true);         return engineoptions;     }      @override     public boolean onkeydown(int keycode, keyevent event)      {           if (keycode == keyevent.keycode_back)         {             scenemanager.getinstance().getcurrentscene().onbackkeypressed();         }         return false;      }      public void oncreateresources(oncreateresourcescallback poncreateresourcescallback) throws ioexception     {         resourcesmanager.preparemanager(mengine, this, camera, getvertexbufferobjectmanager());         poncreateresourcescallback.oncreateresourcesfinished();           try         {             music = musicfactory.createmusicfromasset(mengine.getmusicmanager(), this,"music/music.ogg");         }         catch (ioexception e)         {             e.printstacktrace();         }      }      adview adview ;@override     @suppresslint("newapi")     protected void onsetcontentview() {           final framelayout framelayout = new framelayout(this);         final framelayout.layoutparams framelayoutlayoutparams = new framelayout.layoutparams(                 framelayout.layoutparams.match_parent, framelayout.layoutparams.match_parent, gravity.fill);         final framelayout.layoutparams adviewlayoutparams = new framelayout.layoutparams(framelayout.layoutparams.wrap_content,                 framelayout.layoutparams.wrap_content, gravity.center | gravity.top);          adview = new adview(this);         adview.setadunitid("admobid");         //adview.setadunitid("admobid");         adview.setadsize(adsize.);          adview.setvisibility(adview.visible);         adview.refreshdrawablestate();          adrequest adrequest = new adrequest.builder().build();         adview.loadad(adrequest);          if (android.os.build.version.sdk_int > android.os.build.version_codes.gingerbread_mr1) {             adview.setlayertype(view.layer_type_software, null);         }           this.mrendersurfaceview = new rendersurfaceview(this);         mrendersurfaceview.setrenderer(mengine, this);            final framelayout.layoutparams surfaceviewlayoutparams = new framelayout.layoutparams(                 android.view.viewgroup.layoutparams.match_parent, android.view.viewgroup.layoutparams.match_parent);         surfaceviewlayoutparams.gravity = gravity.center;          framelayout.addview(this.mrendersurfaceview, surfaceviewlayoutparams);          adview.setadlistener(new adlistener() {             public void onadloaded(){                  if(flag==0)                 {flag=1;                 framelayout.addview(adview, adviewlayoutparams);                  }             }         });           this.setcontentview(framelayout, framelayoutlayoutparams);      }      public void oncreatescene(oncreatescenecallback poncreatescenecallback) throws ioexception     {         scenemanager.getinstance().createsplashscene(poncreatescenecallback);     }      public void onpopulatescene(scene pscene, onpopulatescenecallback ponpopulatescenecallback) throws ioexception     {         mengine.registerupdatehandler(new timerhandler(2f, new itimercallback()          {             public void ontimepassed(final timerhandler ptimerhandler)              {                 mengine.unregisterupdatehandler(ptimerhandler);                 scenemanager.getinstance().createmenuscene();              }         }));         ponpopulatescenecallback.onpopulatescenefinished();     }     @override     protected void onpause() {         scenemanager.getinstance().gamescene.onbackkeypressed();         super.onpause();     }     @override     protected void ondestroy()     {         super.ondestroy();         system.exit(0);      } } 

gameover method trying put interstitial

private void gameover() {this.gameovercheck = 1; this.setignoreupdate(true); sprite gameover = new sprite(camera.getcenterx(), camera.getcentery(), resourcesmanager.gameover, vbom); this.attachchild(gameover); rocket.setcurrenttileindex(2);         activity.runonuithread(new runnable(){          @override         public void run() {             // todo auto-generated method stub              interstitialad interstitial = new interstitialad(activity);             interstitial.setadunitid("ca-app-pub-3940256099942544/1033173712");              adrequest adrequest = new adrequest.builder().build();               interstitial.loadad(adrequest);                  interstitial.show();            }      }); soundonbtn1 = new sprite(camera.getcenterx(),camera.getcentery()-200, resourcesmanager.retry, vbom) {      public boolean onareatouched(touchevent pscenetouchevent, float x, float y)     {if(pscenetouchevent.isactiondown())          scenemanager.getinstance().loadgamescene1(engine);     gameovercheck=0;     editor.commit();     editor.commit();     return true;     }; }; this.attachchild(soundonbtn1); this.registertoucharea(soundonbtn1); 

you have make sure interstitial ad preloaded, otherwise won't shown.

preload interstitial.loadad(adrequest); e.g. when start scene.

and in gameover method check isloaded this

boolean loaded = interstitialad.isloaded(); if (loaded) {   interstitial.show(); } else { //loadyourinterstitial }