AdRequest adRequest;
        InterstitialAd mInterstitialAd;
        MyCountDownTimer myCountDownTimer;
         mInterstitialAd = new InterstitialAd(getActivity());
            mInterstitialAd.setAdUnitId("ca-app-pub-
     9547225037870226/6863551510");

            adRequest = new AdRequest.Builder()
                    .build();
            mInterstitialAd.setAdListener(new AdListener() {
                @Override
                public void onAdFailedToLoad(int i) {
                    super.onAdFailedToLoad(i);
                    Toast.makeText(getActivity(), "ad failed to load",
     Toast.LENGTH_SHORT).show();


                }
                @Override
                public void onAdLoaded() {
                    Toast.makeText(getActivity(), "ad loaded",
    Toast.LENGTH_SHORT).show();

                    showInterstitial();
                }

                @Override
                public void onAdClicked() {
                    super.onAdClicked();
  //use can see here i have added toast but its not toasting message
                    Toast.makeText(getActivity(), "ad clicked",
   Toast.LENGTH_SHORT).show();

                    myCountDownTimer = new MyCountDownTimer(10000, 1000);
                    myCountDownTimer.start();
                }

                @Override
                public void onAdOpened() {
                    super.onAdOpened();
                    Toast.makeText(getActivity(), "ad open",
    Toast.LENGTH_SHORT).show();

                }

                @Override
                public void onAdImpression() {
                    super.onAdImpression();
                    Toast.makeText(getActivity(), "ad impression",
    Toast.LENGTH_SHORT).show();

                }

                @Override
                public void onAdClosed() {
                    super.onAdClosed();
                    Toast.makeText(getActivity(), "ad close",
    Toast.LENGTH_SHORT).show();

                }
            });
     clickme.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    mInterstitialAd.loadAd(adRequest);
                }
            });

      private void showInterstitial() {
            if (mInterstitialAd.isLoaded()) {
                mInterstitialAd.show();
            }
        }