Escribir en un EditText tipo tarjeta de crédito

private TextWatcher txtwatcher = new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(!s.toString().equals(current)){
                    String clean = s.toString().replaceAll("[^\\d.]", "");
                    String cleanC = current.replaceAll("[^\\d.]", "");
                    int cl = clean.length();
                    int sel = cl;
                    for (int i = 2; i <= cl && i < 6; i += 2) {
                        sel++;
                    }
                    if (clean.equals(cleanC)) sel--;

                    if (clean.length() < 8){
                        clean = clean + ddmmyyyy.substring(clean.length());
                    }else{
                        int day = Integer.parseInt(clean.substring(0,2));
                        int