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    <p>I noticed the same problem in <a href="https://code.google.com/p/iosched/" rel="nofollow noreferrer">IOSched App</a> (Google I/O App for Android).</p> <p>They created <a href="https://code.google.com/p/iosched/source/browse/android/src/com/google/android/apps/iosched/util/DetachableResultReceiver.java?r=27a82ff10b436da5914a3961df245ff8f66b6252" rel="nofollow noreferrer">DetachableResultReceiver</a>, which extends SDK class <a href="http://developer.android.com/reference/android/os/ResultReceiver.html" rel="nofollow noreferrer">ResultReciever</a>.</p> <p>And they easily <a href="https://code.google.com/p/iosched/source/browse/android/src/com/google/android/apps/iosched/ui/HomeActivity.java?r=27a82ff10b436da5914a3961df245ff8f66b6252" rel="nofollow noreferrer">use it in Fragments</a>.</p> <p><strong>Receiver:</strong></p> <pre><code>/** * Proxy {@link ResultReceiver} that offers a listener interface that can be * detached. Useful for when sending callbacks to a {@link Service} where a * listening {@link Activity} can be swapped out during configuration changes. */ public class DetachableResultReceiver extends ResultReceiver { private static final String TAG = "DetachableResultReceiver"; private Receiver mReceiver; public DetachableResultReceiver(Handler handler) { super(handler); } public void clearReceiver() { mReceiver = null; } public void setReceiver(Receiver receiver) { mReceiver = receiver; } public interface Receiver { public void onReceiveResult(int resultCode, Bundle resultData); } @Override protected void onReceiveResult(int resultCode, Bundle resultData) { if (mReceiver != null) { mReceiver.onReceiveResult(resultCode, resultData); } else { Log.w(TAG, "Dropping result on floor for code " + resultCode + ": " + resultData.toString()); } } } </code></pre> <p><strong>Activity and Fragment:</strong></p> <pre><code>public class HomeActivity extends BaseActivity { private static final String TAG = "HomeActivity"; private SyncStatusUpdaterFragment mSyncStatusUpdaterFragment; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //... mTagStreamFragment = (TagStreamFragment) fm.findFragmentById(R.id.fragment_tag_stream); mSyncStatusUpdaterFragment = (SyncStatusUpdaterFragment) fm .findFragmentByTag(SyncStatusUpdaterFragment.TAG); if (mSyncStatusUpdaterFragment == null) { mSyncStatusUpdaterFragment = new SyncStatusUpdaterFragment(); fm.beginTransaction().add(mSyncStatusUpdaterFragment, SyncStatusUpdaterFragment.TAG).commit(); triggerRefresh(); } } private void triggerRefresh() { final Intent intent = new Intent(Intent.ACTION_SYNC, null, this, SyncService.class); intent.putExtra(SyncService.EXTRA_STATUS_RECEIVER, mSyncStatusUpdaterFragment.mReceiver); startService(intent); if (mTagStreamFragment != null) { mTagStreamFragment.refresh(); } } /** * A non-UI fragment, retained across configuration changes, that updates its activity's UI * when sync status changes. */ public static class SyncStatusUpdaterFragment extends Fragment implements DetachableResultReceiver.Receiver { public static final String TAG = SyncStatusUpdaterFragment.class.getName(); private boolean mSyncing = false; private DetachableResultReceiver mReceiver; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); mReceiver = new DetachableResultReceiver(new Handler()); mReceiver.setReceiver(this); } /** {@inheritDoc} */ public void onReceiveResult(int resultCode, Bundle resultData) { HomeActivity activity = (HomeActivity) getActivity(); if (activity == null) { return; } switch (resultCode) { case SyncService.STATUS_RUNNING: { mSyncing = true; break; } //... } activity.updateRefreshStatus(mSyncing); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); ((HomeActivity) getActivity()).updateRefreshStatus(mSyncing); } } } </code></pre>
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    1. POHow should a fragment get notified about the result of an asynchronous task?
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    1. POHow should a fragment get notified about the result of an asynchronous task?
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    1. COFor whatever reason the link to DetachableResultReceiver is not working for me, this works if anyone needs it: http://code.google.com/p/iosched/source/search?q=+DetachableResultReceiver&origq=+DetachableResultReceiver&btnG=Search+Trunk
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    2. COCan you please explain that how to use it?
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    3. COSimply linking to documentation and examples does not make a good answer. When these links decay this answer will be nearly useless. Please improve this answer by providing summaries of the documentation you have linked to.
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