Edittext input type password, not hiding text after clear focus android

I am using a view to enter user's four digit PIN. the UI consists of 4 edittext each having maxLength set to 1. On entering value to edit text1, focus is then shifted to the second edittext and so on. each Edittext input type is : numberPassword.

<EditText
            android:id="@+id/ed_1"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:gravity="center"
            android:inputType="numberPassword"
            android:maxLength="1" />

In java, to shift the focus, we have applied following text watcher to each of the edittext:

ed1.addTextChangedListener(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().length() == 1) {
                ed1.clearFocus();
                ed2.requestFocus();
                ed2.setCursorVisible(true);
            }
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });

Problem is, value of edittext are not changing to *, it shows the real input number (not changing to password). Only 1st and last are changing to *, where as center two that means edittext 2 and edittext 3 are still have visible passwords.

Right now: We have 4 input Edittexts

desired output should be: | * | * | * | * |

When we fill the values, and switches the focus, by using java code specified, they get change to: (input value: 1234): | * | 2 | 3 | * |

If we focus back on either of the center edit texts, then value changes to password. Is it because of removing focus, and the transformation time required to change a field to password takes more time? Is there any method with which we can forcefully change the value to password.