Convert Password Characters into a placeholder character.

Overview

This code is used to covert password characters into an Asterisk. To do that you have to create a class and extend the class with PasswordTransformationMethod

 public class AsteriskMethod extends PasswordTransformationMethod {
    public CharSequence mPassword;

    @Override
    public CharSequence getTransformation(CharSequence source, View view) {
        return new AsteriskMethod.PasswordCharSequence(source);
    }

    private class PasswordCharSequence implements CharSequence {

        public PasswordCharSequence(CharSequence source) {
            mPassword = source;
            // Store char sequence
        }

        public char charAt(int index) {
            return '*'; // This is the important part
        }

        public int length() {
            return mPassword.length(); // Return default
        }

        public CharSequence subSequence(int start, int end) {
            return mPassword.subSequence(start, end); // Return default
        }
    }
 }

To use this class, you can use the following code

 inputUserPassword.setTransformationMethod(new AsteriskMethod()); // inputUserPassword is an EditText

Reference