code: private TextWatcher createTextChangeListener() {
          return new TextWatcher() {
  
              @Override
              public final void beforeTextChanged(final CharSequence s, final int start,
                                                  final int count, final int after) {
  
              }
  
              @Override
              public final void onTextChanged(final CharSequence s, final int start, final int before,
                                              final int count) {
  
              }
  
              @Override
              public final void afterTextChanged(final Editable s) {
                  verifyPasswordStrength();
              }
  
          };
      }
docs: Creates and returns a listener, which allows to verify the password strength, when the
  password has been changed.
  
  @return The listener, which has been created, as an instance of the type {@link TextWatcher}