If you use RESULT_OK, onActivityResult() is not called.

http://developer.android.com/reference/android/app/Activity.html

public void startActivityForResult (Intent intent, int requestCode)

Added in API level 1

Same as calling startActivityForResult(Intent, int, Bundle) with no options.

Parameters

intent	The intent to start.
requestCode	If >= 0, this code will be returned in onActivityResult() when the activity exits.

Throws

	android.content.ActivityNotFoundException

See Also

• startActivity(Intent)

If you set the requestCode as RESULT_OK, you can't receive the callback data in onActivityResult() function. For RESULT_OK is -1.