```java
@OnClick(R.id.sign_in_btn)
public void onSignInButtonClicked(View view){
    DisplayUtility.hideKeyboard(getContext(), view);

    String username = mEmailInputLayout.getEditText().getText().toString();
    String password = mPasswordInputLayout.getEditText().getText().toString();

    final boolean emailIsValid = validateEmail(username);
        final boolean passwordIsValid = validatePassword(password);

        if(emailIsValid && passwordIsValid){
            mEmailInputLayout.setError(null);
            mPasswordInputLayout.setError(null);

            disableError(mEmailInputLayout);
            disableError(mPasswordInputLayout);
//            mEmailInputLayout.setErrorEnabled(false);
//            mPasswordInputLayout.setErrorEnabled(false);
            doLogin();
            return;
        } else if(emailIsValid){
            mEmailInputLayout.setError(null);

            disableError(mEmailInputLayout);
//            mEmailInputLayout.setErrorEnabled(false);
        } else if(passwordIsValid){
            mPasswordInputLayout.setError(null);

            disableError(mPasswordInputLayout);
//            mPasswordInputLayout.setErrorEnabled(false);
        }

        if(!emailIsValid){
            enableError(mEmailInputLayout);
//            mEmailInputLayout.setErrorEnabled(true);

            mEmailInputLayout.setError("Not a valid email address!");
        }

        if(!passwordIsValid){
            enableError(mPasswordInputLayout);
//            mPasswordInputLayout.setErrorEnabled(true);

            mPasswordInputLayout.setError("Not a valid password!");
        }
}

private void enableError(TextInputLayout textInputLayout){
    if (textInputLayout.getChildCount() == 2)
        textInputLayout.getChildAt(1).setVisibility(View.VISIBLE);
}

private void disableError(TextInputLayout textInputLayout){
    if (textInputLayout.getChildCount() == 2)
        textInputLayout.getChildAt(1).setVisibility(View.GONE);
}
```