Best Way to set interstitial ads

Your_Activity.java

        Button button = findViewById(R.id.showAds);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                if (mInterstitialAd != null) {
                    mInterstitialAd.show(MainActivity.this);

                    mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback(){
                            
                            //Ads Dismissed here
                            
                        @Override
                        public void onAdDismissedFullScreenContent() {

                            Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
                            startActivity(intent);
                                
                                //Load your Ads Again

                        }
                    });

                } else {
                        
                    Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
                    startActivity(intent);
                        
                }
            }
        });