Spinner Selection Change To Different Activity

So I am new to developing android apps and had a question. I have a spinner and based on the selection I was wondering the best way to call another class / layout.Here is my main class

Code:
public class BestBuyMobileActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
[code]....