change public class Menu extends ListActivity {
to
public class Menu extends ListActivity implements OnItemClickListener {
and try listview.setOnItemClickListener(this);
update
add
ListView list1 = (ListView) findViewById(R.id.list);
list1.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, classes));
list1 = getListView();
to your onCreate
and then
list1.setOnItemClickListener(
new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View view,
int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
String positie = classes[position];
try{
Class ourClass = Class.forName("com.jacob.eindproject.MAIN" + positie);
Intent ourIntent = new Intent(Menu.this, ourClass);
startActivity(ourIntent);
}catch (ClassNotFoundException e){
e.printStackTrace();
}
}
}
);