public class MainActivity extends AppCompatActivity {

    @BindView(R.id.button)
    Button btn;

    @BindView(R.id.loginEditText)
    EditText loginEditText;

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


        ButterKnife.bind(this);

    }

    @OnClick(R.id.button)
    public void onClick() {
        String login = loginEditText.getText().toString();
        Toast.makeText(this, login, Toast.LENGTH_LONG).show();
    }
}