Fragment Communication Example

/////////////////////////////////////////////////////////////////////////////////
// ContentListFragment
////////////////////////////////////////////////////////////////////////////////
private int             mBookTypeId;
private final static String     BOOK_TYPE_ID    = "BOOKTYPE_ID";

public ContentListFragment() {}

/**
* Returns a new instance of this fragment for the given section number.
*/
public static ContentListFragment newInstance(int bookTypeId) {
   ContentListFragment fragment = new ContentListFragment();
   Bundle args = new Bundle();
   args.putInt(BOOK_TYPE_ID, bookTypeId);
   fragment.setArguments(args);
   return fragment;
}


/**
 * This method will only be called once when the retained Fragment is first
 * created.
 */
@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setRetainInstance(true);
   Bundle args = getArguments();
   mBookTypeId = args.getInt(BOOK_TYPE_ID);
}


/////////////////////////////////////////////////////////////////////////////////////////////////////////
// MainActivity
////////////////////////////////////////////////////////////////////////////////////////////////////////
int mBookNumber = 1;
public static final String  CONTENT_LIST_FRAGMENT_TAG   = "ContentListFragment";
private FragmentTransaction     mFragmentTransaction                = null;
@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   if (savedInstanceState == null) {
      mFragmentTransaction = getSupportFragmentManager().beginTransaction();
      mFragmentTransaction.replace(R.id.content_frame,
                                   ContentListFragment.newInstance(mBookNumber),
                   CONTENT_LIST_FRAGMENT_TAG);
      mFragmentTransaction.commit();
   }
}