LoginDialogFragment.java

@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 the user receives an error message due to a blank field, this
 * automatically clears the error on the field once they remedy it.
 */
@Override
public void afterTextChanged(Editable s) {
    if (username.getText().length() > 0 && username.getError() != null)
        username.setError(null);

    if (password.getText().length() > 0 && password.getError() != null)
        password.setError(null);
}