Format credit card in edit text in android

Question

How to make EditText accept input in format:

4digit 4digit 4digit 4digit 

I tried Custom format edit text input android to acc

Answer 1

int          keyDel;
String       a;
String       a0;
int          isAppent = 0;
final String ch       = " ";

private void initListner() {


    txtCreditNumber.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

            boolean flag = true;
            if (s.length() > 19) {
                txtCreditNumber.setText(a0);
                txtCreditNumber.setSelection(txtCreditNumber.getText().length());
                return;
            }
            String eachBlock[] = s.toString().split(ch);
            for(int i = 0; i < eachBlock.length; i++) {
                if (eachBlock[i].length() > 4) {
                    flag = false;
                }
            }
            if (a0.length() > s.toString().length()) {
                keyDel = 1;
            }
            if (flag) {
                if (keyDel == 0) {

                    if (((txtCreditNumber.getText().length() + 1) % 5) == 0) {

                        if (s.toString().split(ch).length <= 3) {
                            isAppent = 1;
                            txtCreditNumber.setText(s + ch);
                            isAppent = 0;
                            txtCreditNumber.setSelection(txtCreditNumber.getText().length());
                            a = txtCreditNumber.getText().toString();
                            return;
                        }
                    }
                    if (isAppent == 0) {
                        String str = s.toString();
                        if (str.lastIndexOf(ch) == str.length() - 1) {
                            str = str.substring(0, str.lastIndexOf(ch));
                            keyDel = 1;
                            txtCreditNumber.setText(str);
                            keyDel = 0;
                            txtCreditNumber.setSelection(txtCreditNumber.getText().length());
                            a = txtCreditNumber.getText().toString();
                            return;
                        }
                    }

                }
                else {
                    String str = s.toString();
                    if (str.length() > 0 && str.lastIndexOf(ch) == str.length() - 1) {
                        str = str.substring(0, str.lastIndexOf(ch));
                        keyDel = 1;
                        txtCreditNumber.setText(str);
                        keyDel = 0;
                        txtCreditNumber.setSelection(txtCreditNumber.getText().length());
                        a = txtCreditNumber.getText().toString();
                        return;
                    }
                    else {
                        a = txtCreditNumber.getText().toString();
                        keyDel = 0;
                    }
                }

            }
            else {
                String str = s.toString();
                str = str.substring(0, str.length() - 1) + ch + str.substring(str.length() - 1, str.length());

                a = str;
                txtCreditNumber.setText(a);
                txtCreditNumber.setSelection(txtCreditNumber.getText().length());
            }

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            // TODO Auto-generated method stub
            a0 = s.toString();
        }

        @Override
        public void afterTextChanged(Editable s) {
        }
    });
}