Android Fragment handle back button press [duplicate]

Answer 1

I'm working with SlidingMenu and Fragment, present my case here and hope helps somebody.

Logic when [Back] key pressed :

1. When SlidingMenu shows, close it, no more things to do.
2. Or when 2nd(or more) Fragment showing, slide back to previous Fragment, and no more things to do.

3. SlidingMenu not shows, current Fragment is #0, do the original [Back] key does.

   public class Main extends SherlockFragmentActivity
   {
     private SlidingMenu menu=null;
     Constants.VP=new ViewPager(this);
   
     //Some stuff...
   
     @Override
     public void onBackPressed()
     {
       if(menu.isMenuShowing())
       {
         menu.showContent(true); //Close SlidingMenu when menu showing
         return;
       }
       else
       {
         int page=Constants.VP.getCurrentItem();
         if(page>0)
         {
           Constants.VP.setCurrentItem(page-1, true); //Show previous fragment until Fragment#0
           return;
         }
         else
         {super.onBackPressed();} //If SlidingMenu is not showing and current Fragment is #0, do the original [Back] key does. In my case is exit from APP
       }
     }
   }