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POAndroid ContentProvider calls bursts of setNotificationUri() to CursorAdapter when many rows are inserted with a batch operation
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  1. POAndroid ContentProvider calls bursts of setNotificationUri() to CursorAdapter when many rows are inserted with a batch operation
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    copied!<p>I have a custom <code>ContentProvider</code> which manages the access to a SQLite database. To load the content of a database table in a <code>ListFragment</code>, I use the <code>LoaderManager</code> with a <code>CursorLoader</code> and a <code>CursorAdapter</code>:</p> <pre class="lang-java prettyprint-override"><code>public class MyListFragment extends ListFragment implements LoaderCallbacks&lt;Cursor&gt; { // ... CursorAdapter mAdapter; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mAdapter = new CursorAdapter(getActivity(), null, 0); setListAdapter(mAdapter); getLoaderManager().initLoader(LOADER_ID, null, this); } public Loader&lt;Cursor&gt; onCreateLoader(int id, Bundle args) { return new CursorLoader(getActivity(), CONTENT_URI, PROJECTION, null, null, null); } public void onLoadFinished(Loader&lt;Cursor&gt; loader, Cursor c) { mAdapter.swapCursor(c); } public void onLoaderReset(Loader&lt;Cursor&gt; loader) { mAdapter.swapCursor(null); } } </code></pre> <p>The SQLite database gets updated by a background task which fetches a number of items from a web service and inserts these items into the database through <code>ContentProvider</code> batch operations (<code>ContentResolver#applyBatch()</code>).</p> <p>Even if this is a batch operation, <code>ContentProvider#insert()</code> gets called for each row is inserted into the database and, in the current implementation, the <code>ContentProvider</code> calls <code>setNotificationUri()</code> for each insert command. </p> <p>The result is that the <code>CursorAdapter</code> receives bursts of notifications, resulting in the UI being updated too often with consequent annoying flickering effect.</p> <p>Ideally, when a batch operation is in progress, there should be a way to notify <code>ContentObserver</code> only at the end of any batch operation and not with each insert command.</p> <p>Does anybody know if this is possible? Please note I can change the <code>ContentProvider</code> implementation and override any of its methods.</p>
 

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