ContactsListExample.java

 package course.examples.ContentProviders.ContactsList;

import android.app.ListActivity;
import android.app.LoaderManager;
import android.content.CursorLoader;
import android.content.Loader;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract.Contacts;

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

	private ContactInfoListAdapter mAdapter;

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

		// Create and set empty adapter
		mAdapter = new ContactInfoListAdapter(this, R.layout.list_item, null, 0);
		setListAdapter(mAdapter);

		// Initialize the loader
		getLoaderManager().initLoader(0, null, this);

	}

	// Contacts data items to extract
	static final String[] CONTACTS_ROWS = new String[] { Contacts._ID,
			Contacts.DISPLAY_NAME, Contacts.PHOTO_THUMBNAIL_URI };

	// Called when a new Loader should be created
	// Returns a new CursorLoader

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

		// String used to filter contacts with empty or missing names or are unstarred
		String select = "((" + Contacts.DISPLAY_NAME + " NOTNULL) AND ("
				+ Contacts.DISPLAY_NAME + " != '' ) AND (" + Contacts.STARRED
				+ "== 1))";

		// String used for defining the sort order
		String sortOrder = Contacts._ID + " ASC";

		return new CursorLoader(this, Contacts.CONTENT_URI, CONTACTS_ROWS,
				select, null, sortOrder);
	}

	// Called when the Loader has finished loading its data
	@Override
	public void onLoadFinished(Loader<Cursor> loader, Cursor data) {

		// Swap the new cursor into the List adapter
		mAdapter.swapCursor(data);

	}

	// Called when the last Cursor provided to onLoadFinished()
	// is about to be closed

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

		// set List adapter's cursor to null
		mAdapter.swapCursor(null);
	}
}