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 while the 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 of the layout

        ViewGroup root = (ViewGroup) findViewById(android.R.id.content);

        root.addView(progressBar);

        // For the cursor adapter, specify which columns go into which views

        String[] fromColumns = {ContactsContract.Data.DISPLAY_NAME};

        int[] toViews = {android.R.id.text1}; // The TextView in simple_list_item_1

        // Create an empty adapter we will use to display the loaded data.

        // We pass null for the cursor, then update it in onLoadFinished()

        mAdapter = new SimpleCursorAdapter(this,

                android.R.layout.simple_list_item_1, null,

                fromColumns, toViews, 0);

        setListAdapter(mAdapter);

        // Prepare the loader.  Either re-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 CursorLoader that will take care of

        // creating a Cursor for the data being displayed.

        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.  (The framework will take care of closing the

        // old cursor once we return.)

        mAdapter.swapCursor(data);

    }

    // Called when a previously created loader is reset, making the data unavailable

    public void onLoaderReset(Loader<Cursor> loader) {

        // This is called when the last Cursor provided to onLoadFinished()

        // above is about to be closed.  We need to 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

    }

}