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POIs it necessary to implement both LoaderCallbacks and OnLoadCompleteListener to get notifications of changes in a ContentProvider?
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I have an application which is using <code>Loader</code>s to get at a database which is also being edited by an <code>IntentService</code>. I receive data from the <code>Loader</code> through a <code>LoaderCallbacks</code> implementation, which is working fine. I am also using <code>ContentResolver#notifyChange(Uri, ContentObserver)</code> to trigger reload. However, this only works when I call <code>Cursor#setNotificationUri(Uri)</code> beforehand. I can find no reference to the latter method in any documentation and it seems in fact this may be causing crashes: see also <a href="https://stackoverflow.com/questions/14956608/illegalstateexception-attempt-to-re-open-an-already-closed-object-in-simplecur">IllegalStateException "attempt to re-open an already-closed object" in SimpleCursorAdapter from ContentProvider</a> However, without this call on the <code>Cursor</code> the <code>LoaderCallbacks#onLoadFinished(Loader<Cursor>, Cursor)</code> is only hit after the initial load, and not after the notification. Do I also need to implement an <code>OnLoadCompleteListener</code> to do, well, exactly the same thing? <code>ContentProvider</code> query method: <pre><code>class MyContentProvider extends ContentProvider { //... @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { SQLiteDatabase db = mOpenHelper.getReadableDatabase(); Cursor query = db.query(getTableName(uri), projection, selection, selectionArgs, null, null, sortOrder); query.setNotificationUri(getContext().getContentResolver(), uri); return query; } //... } </code></pre> Typical <code>LoaderCallbacks</code>: <pre><code>LoaderCallbacks<Cursor> mCallbacks = new LoaderCallbacks<Cursor>() { @Override public void onLoaderReset(Loader<Cursor> loader) { mArticleAdapter.swapCursor(null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { if(cursor.isClosed()) { Log.d(TAG, "CURSOR RETURNED CLOSED"); Activity activity = getActivity(); if(activity!=null) { activity.getLoaderManager().restartLoader(mFragmentId, null, mCallbacks); } return; } mArticleAdapter.swapCursor(cursor); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { triggerArticleFeed(); CursorLoader cursorLoader = null; if(id == mFragmentId) { cursorLoader = new CursorLoader(getActivity(), MyContentProvider.ARTICLES_URI, null, ArticlesContentHelper.ARTICLES_WHERE, ArticlesContentHelper.ARTICLES_WHEREARGS, null); } return(cursorLoader); } }; </code></pre>
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<android><android-contentprovider><android-cursorloader>
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Is it necessary to implement both LoaderCallbacks and OnLoadCompleteListener to get notifications of changes in a ContentProvider?
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