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POViewPager Activity to notify a Fragment of a specific event
 

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    <p>I have a <code>ViewPager</code> and it is using a <code>FragmentAdapter</code> in order to display several fragments of the same kind. Although these Fragments are basically instantiated from the same class, they are using a <code>ListView</code> to display different information. (Obviously the <code>ListView</code> is being poulated by an <code>ArrayAdapter</code>.)<br> A background service is also running and is constantly receiving data from the Internet. I want to be able to update a specific Fragment in the <code>ViewPager</code> when my background service has notified me of a specific event.<br> How can I do that? A code snippet would be hugely appreciated!</p> <p>(By the way, I have saw <a href="https://stackoverflow.com/questions/6101958/how-should-a-fragment-get-notified-about-the-result-of-an-asynchronous-task">this similar question</a> but I have no idea how to use their suggestion!)</p> <p>To make it all more simple: My activity with the ViewPager:<br> <strong>[Fragment 0] [Fragment 1] [Fragment 2]</strong></p> <p>The background service tells me (via a broadcast) to update the <code>ListView</code> in <strong>Fragment 1</strong>. </p> <p><strong>EDIT:</strong> Here are sample codes: </p> <pre><code>public class ChatWindowPager extends FragmentActivity { private ViewPager mViewPager = null; private ChatFragmentAdapter mAdapter = null; @Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.chat_window_pager); this.mViewPager = (ViewPager) findViewById(R.id.chatPager); this.mAdapter = new ChatFragmentAdapter(getSupportFragmentManager()); this.mViewPager.setAdapter(this.mAdapter); . . . } class ChatFragmentAdapter extends FragmentPagerAdapter implements ViewProvider { public ChatFragmentAdapter(final FragmentManager fm) { super(fm); } @Override public Fragment getItem(final int arg0) { String friendId = ..... // Some initializations ChatWindowFragment f = ChatWindowFragment.newInstance(friendId); return f; } @Override public int getCount() { ... } @Override public View getView(final int position) { View v = getLayoutInflater().inflate(R.layout.tab_holder, null); . . . return v; } } } </code></pre> <p>Now the fragments is defined like this: </p> <pre><code>public class ChatWindowFragment extends Fragment { public String friendId; private ListView lv; public static ChatWindowFragment newInstance(final String friendId) { ChatWindowFragment chatWindowFragment = new ChatWindowFragment(); Bundle bundle = new Bundle(); bundle.putString("friendId", friendId); chatWindowFragment.setArguments(bundle); return chatWindowFragment; } @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.friendId = getArguments().getString("friendId"); } @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { View v = inflater.inflate(R.layout.chat_window, container, false); this.friendId = getArguments().getString("friendId"); . . . return v; } //The rest of the class } </code></pre> <p>As I am using a <code>FragmentPagerAdapter</code> I don't see how I can set the tag of each fragment! (Obviously, I am not using transactions to add the Fragments!)</p> <p><strong>EDIT 2:</strong> I would like to know whether what I'm doing, is the correct way to handle what I want to do... Any other solution is also welcome!</p>
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