To make / between expiration month and year

CreditExpirationDate Edittext

        mEdtPaymentAuthorCreditExpirationDate.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                mLength = mEdtPaymentAuthorCreditExpirationDate.getText().length();
            }

            @Override
            public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
                int currentLength = mEdtPaymentAuthorCreditExpirationDate.getText().length();
                boolean ignoreBecauseIsDeleting = false;
                if (mLength > currentLength) {
                    ignoreBecauseIsDeleting = true;
                }
                if (ignoreBecauseIsDeleting) {
                    return;
                }
                if (charSequence.length() == 2 && !charSequence.toString().contains("/")) {

                    String cleanString = charSequence.toString().replaceAll("[/,.]", "");

                    mEdtPaymentAuthorCreditExpirationDate.setText(cleanString + " / ");
                    mEdtPaymentAuthorCreditExpirationDate.setSelection(charSequence.length() + 3);

                    mEdtPaymentAuthorCreditExpirationDate.addTextChangedListener(this);
                }
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });