Interstial AD after certain clicks (Short Code)

 @SuppressLint("SetTextI18n")
    private void back() {
        if (position > 0) {
            position = (position - 1) % quotes_list.size();
            quotesTxt.setText(quotes_list.get(position));
            countTxt.setText(position + "/" + quotes_list.size());
            Log.d(TAG, quotes_list.toString());
        }
    }

    @SuppressLint("SetTextI18n")
    private void next() {
        position = (position + 1) % quotes_list.size();
        quotesTxt.setText(quotes_list.get(position));
        countTxt.setText(position + "/" + quotes_list.size());
        Log.d(TAG, quotes_list.toString());
    }

    @SuppressLint("SetTextI18n")
    private void random() {
        position = randomQ.nextInt(quotes_list.size());
        quotesTxt.setText(quotes_list.get(position));
        countTxt.setText(position + "/" + quotes_list.size());
        Log.d(TAG, quotes_list.toString());
    }


    private void copy() {
        if (mInterstitialAd != null) {
            mInterstitialAd.show(HomeActivity.this);
            mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback() {
                @Override
                public void onAdDismissedFullScreenContent() {
                    super.onAdDismissedFullScreenContent();
                    startActivity(new Intent(HomeActivity.this, HomeActivity.class));
                    mInterstitialAd = null;
                    intertitalAd();
                    ClipboardManager clipboardManager = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
                    ClipData clipData = ClipData.newPlainText("text", quotesTxt.getText());
                    if (clipboardManager != null) {
                        clipboardManager.setPrimaryClip(clipData);
                    }
                    Toast.makeText(getApplicationContext(), "Copied", Toast.LENGTH_SHORT).show();
                    Log.d(TAG, quotes_list.toString());
                }
            });
        } else {
            startActivity(new Intent(HomeActivity.this, HomeActivity.class));


        }

    }

    private void share() {
        clickCount += 1;
        if (clickCount < 4) {
            startActivity(new Intent(HomeActivity.this, HomeActivity.class));
            Intent intent = new Intent(Intent.ACTION_SEND);
            intent.setType("text/plain");
            intent.putExtra(Intent.EXTRA_TEXT, quotesTxt.getText());
            startActivity(Intent.createChooser(intent, "Share to"));
        } else {
            if (mInterstitialAd != null) {
                mInterstitialAd.show(HomeActivity.this);
                mInterstitialAd.setFullScreenContentCallback(new FullScreenContentCallback() {
                    @Override
                    public void onAdDismissedFullScreenContent() {
                        super.onAdDismissedFullScreenContent();
                        startActivity(new Intent(HomeActivity.this, HomeActivity.class));
                        mInterstitialAd = null;
                        intertitalAd();
                        Intent intent = new Intent(Intent.ACTION_SEND);
                        intent.setType("text/plain");
                        intent.putExtra(Intent.EXTRA_TEXT, quotesTxt.getText());
                        startActivity(Intent.createChooser(intent, "Share to"));
                        clickCount = 0;
                    }
                });
            } else {
                startActivity(new Intent(HomeActivity.this, HomeActivity.class));


            }
        }


    }

 @SuppressLint("SetTextI18n")
    private void latestQuote() {

        position = quotes_list.size() - 1;
        quotesTxt.setText(quotes_list.get(position));
        countTxt.setText(position + "/" + quotes_list.size());
        Log.d(TAG, quotes_list.toString());


    }

    @SuppressLint("SetTextI18n")
    private void firstQuote() {
        position = 0;
        quotesTxt.setText(quotes_list.get(position));
        countTxt.setText(position + "/" + quotes_list.size());
        Log.d(TAG, quotes_list.toString());
    }