When the user call a "Configuration" ítem of the app's menu and get back to the Main activity I want to execute something else ... I guess, I have to use startActivityForResult function correct?, but I have one question, the second Activity(PreferenceActivity / Configuration) does not has a "OK" or "CANCEL" button, so Where I have to put the finish() function to return to main activity ?, only the user get back to the main Activity when press back
Override onBackPressed() nad use setResult(...) method in second Activity