example1.java

@Override
public Object instantiateItem(View container, int position) {
  if (mCurTransaction == null) {
    mCurTransaction = mFragmentManager.beginTransaction();
  }

  // Do we already have this fragment?
  String name = makeFragmentName(container.getId(), position);
  Fragment fragment = mFragmentManager.findFragmentByTag(name);
  if (fragment != null) {
      if (DEBUG) Log.v(TAG, "Attaching item #" + position + ": f=" + fragment);
      mCurTransaction.attach(fragment);
  } else {
      fragment = getItem(position);
      if (DEBUG) Log.v(TAG, "Adding item #" + position + ": f=" + fragment);
      mCurTransaction.add(container.getId(), fragment, 
                          makeFragmentName(container.getId(), position));
  }
  if (fragment != mCurrentPrimaryItem) {
      fragment.setMenuVisibility(false);
  }

  return fragment;
}