Apps "onActivityResult" doesn't work

[Battleprof]

I'm developping an app:
there is main TabActivity, which has two tabs with two different Activities.
In one of them I have

Intent i = new Intent(getApplicationContext(), PrepareRequestTokenActivity.class);
startActivityForResult(i, OAUTH_REQUEST);

PrepareRequestTokenActivity executes OAuth authentification using a browser and when it's done, has these lines

setResult(RESULT_OK, null);
finish();

And, finally, I have onActivityResult method in Activity, which I was starting ActivityForResult from

@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {...}

As I see logs, result is set correctly, but there is no call of onActivityResult

What can be the problem?
Or should I provide the whole project to let you help me?

 

[Battleprof]

update:
Through the logs, onActivityResult is called right when activity that i'm starting BeGIN to work oO
not waiting setResult(..) and finish() methods.
Why is it that way?

 

[Battleprof]

Well, the problem is in

android:launchMode="singleTask"

But if I remove this, I can't use onNewIntent method, can I?

So what would be the solution, if I want to know, when does the activity end, but in this activity I want to catch an intent from browser?