public class ListViewLoader extends ListActivity
        implements LoaderManager.LoaderCallbacks<Cursor> {

// This is the Adapter being used to display the list's data
    SimpleCursorAdapter mAdapter;

// These are the Contacts rows that we will retrieve
    static final String[] PROJECTION = new String[] {ContactsContract.Data._ID,
            ContactsContract.Data.DISPLAY_NAME};

// This is the select criteria
    static final String SELECTION = "((" +
            ContactsContract.Data.DISPLAY_NAME + " NOTNULL)AND (" +
            ContactsContract.Data.DISPLAY_NAME + " != ''))";

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

// Create a progress bar to display whilethe list loads
        ProgressBar progressBar = new ProgressBar(this);
        progressBar.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT, Gravity.CENTER));
        progressBar.setIndeterminate(true);
        getListView().setEmptyView(progressBar);

// Must add the progress bar to the root ofthe layout
        ViewGroup root = (ViewGroup) findViewById(android.R.id.content);
        root.addView(progressBar);

// For the cursor adapter, specify whichcolumns go into which views
        String[] fromColumns = {ContactsContract.Data.DISPLAY_NAME};
        int[] toViews = {android.R.id.text1}; // The TextViewin simple_list_item_1

// Create an empty adapter we will use todisplay the loaded data.
        // We pass null for the cursor, then updateit in onLoadFinished()
        mAdapter = new SimpleCursorAdapter(this,
                android.R.layout.simple_list_item_1, null,
                fromColumns, toViews, 0);
        setListAdapter(mAdapter);

// Prepare the loader.  Eitherre-connect with an existing one,
        // or start a new one.
        getLoaderManager().initLoader(0, null, this);
    }

// Called when a new Loader needs to be created
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        // Now create and return a CursorLoaderthat will take care of
        // creating a Cursor for the data beingdisplayed.
        return new CursorLoader(this, ContactsContract.Data.CONTENT_URI,
                PROJECTION, SELECTION, null, null);
    }

// Called when a previously created loader has finished loading
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        // Swap the new cursor in.  (Theframework will take care of closing the
        // old cursor once we return.)
        mAdapter.swapCursor(data);
    }

// Called when a previously created loader is reset, making the dataunavailable
    public void onLoaderReset(Loader<Cursor> loader) {
        // This is called when the last Cursorprovided to onLoadFinished()
        // above is about to be closed.  We needto make sure we are no
        // longer using it.
        mAdapter.swapCursor(null);
    }

@Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // Do something when a list item is clicked
    }
}