Pantalla de Login para autentificar usuarios.

public class Login {
  private String username;
  private String password;
  public Login() {
    username="";
    password="";
  }
  public void setUsername(String _username) {
    this.username = _username;
  }
  public String getUsername() {
    return username;
  }
  public void setPassword(String _password) {
    this.password = _password;
  }
  public String getPassword() {
    return password;
  }
}