精简的小示例，用于在中显示联系人姓名
ListView。下面的
Fragment扩展
ListFragment具有默认布局。您无需指定自己的。列表项的布局也取自Android的默认布局（
android.R.layout.simple_list_item_1），它是每个项目的简单一行文本。
import android.content.Context;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.provider.ContactsContract.Contacts;import android.support.v4.app.ListFragment;import android.support.v4.app.LoaderManager.LoaderCallbacks;import android.support.v4.content.CursorLoader;import android.support.v4.content.Loader;import android.support.v4.widget.CursorAdapter;import android.support.v4.widget.SimpleCursorAdapter;public class ContactListFragment extends ListFragment implements LoaderCallbacks<Cursor> { private CursorAdapter mAdapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // create adapter once Context context = getActivity(); int layout = android.R.layout.simple_list_item_1; Cursor c = null; // there is no cursor yet int flags = 0; // no auto-requery! Loader requeries. mAdapter = new SimpleCursorAdapter(context, layout, c, FROM, TO, flags); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // each time we are started use our listadapter setListAdapter(mAdapter); // and tell loader manager to start loading getLoaderManager().initLoader(0, null, this); } // columns requested from the database private static final String[] PROJECTION = { Contacts._ID, // _ID is always required Contacts.DISPLAY_NAME_PRIMARY // that's what we want to display }; // and name should be displayed in the text1 textview in item layout private static final String[] FROM = { Contacts.DISPLAY_NAME_PRIMARY }; private static final int[] TO = { android.R.id.text1 }; @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { // load from the "Contacts table" Uri contentUri = Contacts.CONTENT_URI; // no sub-selection, no sort order, simply every row // projection says we want just the _id and the name column return new CursorLoader(getActivity(), contentUri, PROJECTION, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { // once cursor is loaded, give it to adapter mAdapter.swapCursor(data); } @Override public void onLoaderReset(Loader<Cursor> loader) { // on reset take any old cursor away mAdapter.swapCursor(null); }}
