Android :: How To Force Main Activity To Wait In Android?

I am calling a subactivity from main activity. This subactivity should take few numbers from user (i'm using Edit text control to achieve this), save them to static variable in another class and terminate. I want main activity to wait for subactivity but both are just running simultaneously. Even doing sth like that doesn't help:

Thread t = new Thread(new Runnable(){
public void run(){
Log.v("==================", "run "+new Date());
startActivityForResult(new Intent(ctx,myCustomSubactivity.class),1);
} } );
Log.v("==================", "calling run "+new Date());
t.start(); try { t.join();
} catch (InterruptedException e) {Log.v("==================", "can't join");
}
Log.v("==================", "back from activity "+new Date());

Do you know how to force main activity to wait? Thread.wait() method is not supported in Android (program throws error).