reusing fragments in a fragmentpageradapter

Question

I have a viewpager that pages through fragments. My FragmentPagerAdapter subclass creates a new fragment in the getItem method which seems wasteful. Is there a FragmentPagerAdapter equivalent to the convertView in the listAdapter that will enable me to reuse fragments that have already been created? My code is below.

public class ProfilePagerAdapter extends FragmentPagerAdapter {      ArrayList<Profile> mProfiles = new ArrayList<Profile>();      public ProfilePagerAdapter(FragmentManager fm) {         super(fm);     }      /**      * Adding a new profile object created a new page in the pager this adapter is set to.      * @param profile      */     public void addProfile(Profile profile){         mProfiles.add(profile);     }      @Override     public int getCount() {         return mProfiles.size();     }      @Override     public Fragment getItem(int position) {         return new ProfileFragment(mProfiles.get(position));     } } 

Answer 1

The FragmentPagerAdapter already caches the Fragments for you. Each fragment is assigned a tag, and then the FragmentPagerAdapter tries to call findFragmentByTag. It only calls getItem if the result from findFragmentByTag is null. So you shouldn't have to cache the fragments yourself.

Answer 2

Appendix for Geoff's post:

You can get reference to your Fragment in FragmentPagerAdapter using findFragmentByTag(). The name of the tag is generated this way:

private static String makeFragmentName(int viewId, int index) {      return "android:switcher:" + viewId + ":" + index; } 

where viewId is id of ViewPager

Look at this link: http://code.google.com/p/openintents/source/browse/trunk/compatibility/AndroidSupportV2/src/android/support/v2/app/FragmentPagerAdapter.java#104