Update cursor for Android Search Suggestions ContentProvider asynchronously

Question

I am using a ContentProvider to provide search suggestions for a Searchable Configuration in my app.

I successfully receive query calls and when I create a MatrixCursor, add several rows, and return the cursor, they are properly displayed in the search results.

However, if I make an asynchronous network request to fetch results, then populate the same MatrixCursor with additional rows, these items are not populated in the search results.

I have tried calling

synchronized (cursor) {
    cursor.notifyAll();
}

after adding the additional rows, but this does not appear to produce the desired result.

What is the best practice for asynchronously providing search results by way of a network request?