Based on a question I answered on StackOverflow, I thought it would be a good idea to put this out in public for everyone to see.

This is an example of PasswordTransformationMethod that, in a password field, would display a paradigmic asterisk *, instead of the generic dot •.

Usage

If text were a TextView variable, preferably an EditText, you would call the method using this:

text.setTransformationMethod(new AsteriskPasswordTransformationMethod());

Code

You can find this code on GitHub.

public class AsteriskPasswordTransformationMethod extends PasswordTransformationMethod {
    @Override
    public CharSequence getTransformation(CharSequence source, View view) {
        return new PasswordCharSequence(source);
    }

    private class PasswordCharSequence implements CharSequence {
        private CharSequence mSource;
        public PasswordCharSequence(CharSequence source) {
            mSource = source; // Store char sequence
        }
        public char charAt(int index) {
            return '*'; // This is the important part
        }
        public int length() {
            return mSource.length(); // Return default
        }
        public CharSequence subSequence(int start, int end) {
            return mSource.subSequence(start, end); // Return default
        }
    }
};