edittext_asterix.md

EditText - Change EditText password mask character to asterisk (*)

When we create an EditText and set the inputType to android:inputType="textPassword", the default character that is used to mask the input is a ..

Sometimes, we need to change the default character to something else like an *. Let's see how it works.

• Create a custom class called PasswordCharSequence that inherits from CharSequence class. We can override the charAt method to return *.

      private class PasswordCharSequence implements CharSequence {
          private CharSequence mSource;
          public PasswordCharSequence(CharSequence source) {
              mSource = source;
          }
        
  
        public char charAt(int index) {
            return '*';
        }
        
        public int length() {
            return mSource.length();
        }
        
        public CharSequence subSequence(int start, int end) {
            return mSource.subSequence(start, end);
        }
    }
  

• Create a new custom class called AsteriskPasswordTransformationMethod that inherits the PasswordTransformationMethod class. We can override the getTransformation method.

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

  
  
  Our final class looks like this:

  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;
        }
        
        public char charAt(int index) {
            return '*';
        }
        
        public int length() {
            return mSource.length();
        }
        
        public CharSequence subSequence(int start, int end) {
            return mSource.subSequence(start, end);
        }
     }
  };