I have read this question
[How to disable Button if EditText is empty ?](https://stackoverflow.com/questions/22680106/how-to-disable-button-if-edittext-is-empty)

But there it is only 1 `EditText` field. What is an elegant solution to use a TextWatcher to enable or disable a `Button` if both of two `EditText` fields are either empty or contain text?

This is my approach and it works, but it makes no use of any of the arguments passed in `onTextChanged`. What do you think?

```
public class MainActivity extends AppCompatActivity implements TextWatcher {
private EditText editTextUsername;
private EditText editTextPassword;
private Button buttonConfirm;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    editTextUsername = findViewById(R.id.edit_text);
    editTextPassword = findViewById(R.id.edit_password);
    buttonConfirm = findViewById(R.id.button_confirm);

    editTextUsername.addTextChangedListener(this);
    editTextPassword.addTextChangedListener(this);
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {

}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
    String usernameInput = editTextUsername.getText().toString().trim();
    String passwordInput = editTextPassword.getText().toString().trim();

    buttonConfirm.setEnabled(!usernameInput.isEmpty() && !passwordInput.isEmpty());
}

@Override
public void afterTextChanged(Editable s) {

}
}

```