iniciar nuevas actividades desde ImageButtons

I have MainMenu. There's 3 different ImageButtons for starting new Activities. Everything work fine, but I wondering is possible another way to code this. I took this from example code with one button, and I think its not look good: setting nuevo OnClickListener () para cada botón.

public class MainMenu extends Activity implements OnClickListener{

ImageButton firstModule;
ImageButton secondModule;
ImageButton thirdModule;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_menu);

    //init buttons
    firstModule =  (ImageButton) findViewById(R.id.imageButton1);
    secondModule = (ImageButton) findViewById(R.id.imageButton2);
    thirdModule =  (ImageButton) findViewById(R.id.imageButton3);

    firstModule.setOnClickListener(this);
    secondModule.setOnClickListener(this);
    thirdModule.setOnClickListener(this);
}
public void onClick(View v) {

    switch(v.getId()){
    case R.id.imageButton1:
        startActivity(new Intent(MainMenu.this, BasicFunctions.class));
        break;
    case R.id.imageButton2:
        startActivity(new Intent(MainMenu.this, GpsModule.class));
        break;
    case R.id.imageButton3:
        startActivity(new Intent(MainMenu.this, Graphic3D.class));
        break;
    }

}

}