To connect SQLite to the and to save the data in SQLite, implement the activity LoaderManager.LoaderCallbacks<Cursor> and instatiate the datasource in the onCreate method:

mDataSource = new MemoriesDataSource(this);
getLoaderManager().initLoader(0,null,this);

Implement the callback methods for the LoaderManager.LoaderCallbacks<Cursor> interface:

@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    return null;
}

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {

}

@Override
public void onLoaderReset(Loader<Cursor> loader) {

}

Now, refactor the addingMarker code in a method as follows:

private void addMarker(Memory memory) {
    Marker marker = mMap.addMarker(new MarkerOptions()
            .draggable(true)
            .position(new LatLng(memory.latitude, memory.longitude)));

    mMemories.put(marker.getId(), memory);
}

We still need to work with dragging the marker for future implementation...