how to format credit card expiry date in mm/yy when entered by user

android:maxLength="5"

And set as phone to editText so that it can display "/"

android:inputType="phone"

on the textWatcher do this .... I will validate later for the correct mm/yy month year to avoid users input data like 55/66 max should be 12/31 but it should be validated for months with less or 30 days...

 @Override
    public void afterTextChanged(Editable editable) {


        if (editable.length() > 0 && (editable.length() % 3) == 0) {
            final char c = editable.charAt(editable.length() - 1);
            if ('/' == c) {
                editable.delete(editable.length() - 1, editable.length());
            }
        }
        if (editable.length() > 0 && (editable.length() % 3) == 0) {
            char c = editable.charAt(editable.length() - 1);
            if (Character.isDigit(c) && TextUtils.split(editable.toString(), String.valueOf("/")).length <= 2) {
                editable.insert(editable.length() - 1, String.valueOf("/"));
            }
        }
    }

I just implement a method like Uber credit card date format with auto check, autocomplete, auto move to CVV edittext.

 <EditText
            android:id="@+id/credit_card_expire_et"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginRight="@dimen/activity_horizontal_margin"
            android:layout_weight="1"
            android:hint="MM/YY"
            android:inputType="number"
            android:maxLength="5"
            android:maxLines="1" />

    <EditText
        android:id="@+id/credit_card_cvv_et"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_weight="1"
        android:hint="CVV"
        android:inputType="number"
        android:maxLength="3"
        android:maxLines="1" />

.

@BindView(R.id.credit_card_expire_et)
EditText creditExpireEt;
@BindView(R.id.credit_card_cvv_et)
EditText creditCVVEt;


@OnTextChanged(value = R.id.credit_card_expire_et, callback = BEFORE_TEXT_CHANGED)
    void beforeExpireEtChanged() {
        previousLength = creditExpireEt.getText().toString().length();
    }

    @OnTextChanged(R.id.credit_card_expire_et)
    void autoFixAndMoveToNext() {
        int length = creditExpireEt.getText().toString().trim().length();

        if (previousLength <= length && length < 3) {
            int month = Integer.parseInt(creditExpireEt.getText().toString());
            if (length == 1 && month >= 2) {
                String autoFixStr = "0" + month + "/";
                creditExpireEt.setText(autoFixStr);
                creditExpireEt.setSelection(3);
            } else if (length == 2 && month <= 12) {
                String autoFixStr = creditExpireEt.getText().toString() + "/";
                creditExpireEt.setText(autoFixStr);
                creditExpireEt.setSelection(3);
            } else if (length ==2 && month > 12) {
                creditExpireEt.setText("1");
                creditExpireEt.setSelection(1);
            }
        } else if (length == 5) {
            creditCVVEt.requestFocus(); // auto move to next edittext
        }
    }