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POUpdate data in ListFragment as part of ViewPager
 

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    <p>I'm using the v4 compatibility ViewPager in Android. My FragmentActivity has a bunch of data which is to be displayed in different ways on different pages in my ViewPager. So far I just have 3 instances of the same ListFragment, but in the future I will have 3 instances of different ListFragments. The ViewPager is on a vertical phone screen, the lists are not side-by-side.</p> <p>Now a button on the ListFragment starts an separate full-page activity (via the FragmentActivity), which returns and FragmentActivity modifies the data, saves it, then attempts to update all views in its ViewPager. It is here, where I am stuck.</p> <pre><code>public class ProgressMainActivity extends FragmentActivity { MyAdapter mAdapter; ViewPager mPager; @Override public void onCreate(Bundle savedInstanceState) { ... mAdapter = new MyAdapter(getSupportFragmentManager()); mPager = (ViewPager) findViewById(R.id.viewpager); mPager.setAdapter(mAdapter); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { ... updateFragments(); ... } public void updateFragments() { //Attempt 1: //mAdapter.notifyDataSetChanged(); //mPager.setAdapter(mAdapter); //Attempt 2: //HomeListFragment fragment = (HomeListFragment) getSupportFragmentManager().findFragmentById(mAdapter.fragId[0]); //fragment.updateDisplay(); } public static class MyAdapter extends FragmentPagerAdapter implements TitleProvider { int[] fragId = {0,0,0,0,0}; public MyAdapter(FragmentManager fm) { super(fm); } @Override public String getTitle(int position){ return titles[position]; } @Override public int getCount(){ return titles.length; } @Override public Fragment getItem(int position) { Fragment frag = HomeListFragment.newInstance(position); //Attempt 2: //fragId[position] = frag.getId(); return frag; } @Override public int getItemPosition(Object object) { return POSITION_NONE; //To make notifyDataSetChanged() do something } } public class HomeListFragment extends ListFragment { ... public static HomeListFragment newInstance(int num) { HomeListFragment f = new HomeListFragment(); ... return f; } ... </code></pre> <p>Now as you can see, my first attempt was to notifyDataSetChanged on the entire FragmentPagerAdapter, and this showed to update the data sometimes, but others I got an IllegalStateException: Can not perform this action after onSaveInstanceState. </p> <p>My second attempt involed trying to call an update function in my ListFragment, but getId in getItem returned 0. As per the docs I tried by </p> <blockquote> <p>acquiring a reference to the Fragment from FragmentManager, using findFragmentById() or findFragmentByTag()</p> </blockquote> <p>but I don't know the tag or id of my Fragments! I have an android:id="@+id/viewpager" for ViewPager, and a android:id="@android:id/list" for my ListView in the ListFragment layout, but I don't think these are useful.</p> <p>So, how can I either: a) update the entire ViewPager safely in one go (ideally returning the user to the page he was on before) - it is ok that the user see the view change. Or preferably, b) call a function in each affected ListFragment to update the ListView manually.</p> <p>Any help would be gratefully accepted!</p>
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