CursorLoader的相关api，自行查询官网

实现效果： ContentPorvider情况下的CurSorLoader自动刷新 官方规定：CursorLoader的API必须使用ContentProvider才能实现数据加载和自动刷新

自定义ContentProvier:

public class MyContentProvider extends ContentProvider {

/*  * * 数据库发生改变时如何自动更新UI*  过程：数据库---contentprovider/contentresolver*             ---cursor的观察者-数据源发生改变*             ---cursorloader重新加载数据*             ---cursoradapter的changercursor提换数据*  做法：*  1. 对cursor数据设置监听的url，即在contentprovider中query()调用（或者loader的loadeingbackground()）调用cursor.setNotificationUri()*  2.ContentProvider的insert()、update()、delete()等方法中调用ContentResolver的notifyChange()方法*/public static final int TABLE1_DIR = 0;
public static final int TABLE1_ITEM = 1;
public static final String AUTHORITY = "com.example.datebasedemo.provider";
private static UriMatcher uriMatcher;
private MySQLite dbHelper;
static {uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);uriMatcher.addURI(AUTHORITY, MySQLite.TABLENAME, TABLE1_DIR);uriMatcher.addURI(AUTHORITY, MySQLite.TABLENAME + "/#", TABLE1_ITEM);
}@Override
public boolean onCreate() {dbHelper = new MySQLite(getContext());return true;
}@Override
public Cursor query(Uri uri, String[] projection, String selection,String[] selectionArgs, String sortOrder) {SQLiteDatabase db = dbHelper.getReadableDatabase();Cursor cursor = null;switch (uriMatcher.match(uri)) {case TABLE1_DIR:cursor = db.query(MySQLite.TABLENAME, projection, selection,selectionArgs, null, null, sortOrder);break;case TABLE1_ITEM:String bookId = uri.getPathSegments().get(1);cursor = db.query(MySQLite.TABLENAME, projection,MySQLite.COLUMN_ID + "= ?", new String[] { bookId }, null,null, sortOrder);break;default:break;}/** 在query（）设置NotificationUri监听* 缺点：上千次并发调用会造成gc操作* */if (cursor != null) {cursor.setNotificationUri(getContext().getContentResolver(), uri);}return cursor;
}@Override
public Uri insert(Uri uri, ContentValues values) {SQLiteDatabase db = dbHelper.getWritableDatabase();Uri uriReturn = null;switch (uriMatcher.match(uri)) {case TABLE1_DIR:case TABLE1_ITEM:long newTableId = db.insert(MySQLite.TABLENAME, null, values);uriReturn = Uri.parse("content://" + AUTHORITY + "/"+ MySQLite.TABLENAME + "/" + newTableId);break;default:break;}getContext().getContentResolver().notifyChange(uri, null);return uriReturn;
}@Override
public int update(Uri uri, ContentValues values, String selection,String[] selectionArgs) {SQLiteDatabase db = dbHelper.getWritableDatabase();int updatedRows = 0;switch (uriMatcher.match(uri)) {case TABLE1_DIR:updatedRows = db.update(MySQLite.TABLENAME, values, selection,selectionArgs);break;case TABLE1_ITEM:String bookId = uri.getPathSegments().get(1);updatedRows = db.update(MySQLite.TABLENAME, values,MySQLite.COLUMN_ID + "= ?", new String[] { bookId });break;}if (updatedRows > 0) {getContext().getContentResolver().notifyChange(uri, null);}return updatedRows;
}@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {SQLiteDatabase db = dbHelper.getWritableDatabase();int deletedRows = 0;switch (uriMatcher.match(uri)) {case TABLE1_DIR:deletedRows = db.delete(MySQLite.TABLENAME, selection,selectionArgs);break;case TABLE1_ITEM:String bookId = uri.getPathSegments().get(1);deletedRows = db.delete(MySQLite.TABLENAME, MySQLite.COLUMN_ID+ "= ?", new String[] { bookId });break;}getContext().getContentResolver().notifyChange(uri, null);return deletedRows;
}@Override
public String getType(Uri uri) {switch (uriMatcher.match(uri)) {case TABLE1_DIR:return "vnd.android.cursor.dir/vnd." + AUTHORITY+ MySQLite.TABLENAME;case TABLE1_ITEM:return "vnd.android.cursor.item/vnd." + AUTHORITY+ MySQLite.TABLENAME;default:break;}return null;
}

}

注册contentProvider:

 <provider android:name="com.example.datebasedemo.db.MyContentProvider"android:authorities="com.example.datebasedemo.provider"></provider>

自定义SQLiteOpenHelper：

public class MySQLite extends SQLiteOpenHelper {

public static final String DATABASENAME = "Book.db";
public static final String TABLENAME = "Book";
public static final String COLUMN_NAME = "name";
public static final String COLUMN_ID = "_id";
public static final String CRATETABLE_SQL = "create table " + MySQLite.TABLENAME+ "(" + MySQLite.COLUMN_ID + " integer primary key autoincrement, "+ MySQLite.COLUMN_NAME + " text" + ")";public MySQLite(Context context) {super(context, MySQLite.DATABASENAME, null, 1);
}@Override
public void onCreate(SQLiteDatabase db) {db.execSQL(CRATETABLE_SQL);Log.i("database", "create");
}@Override
public void onUpgrade(SQLiteDatabase db, int oldVerson, int newVerson) {db.execSQL("drop  table if exists "+TABLENAME);onCreate(db);
}

}

使用CursorLoader：

public class Zixuan_Fragment extends Fragment implements LoaderCallbacks<Cursor> {

private List<String> list = new ArrayList<String>();
private ListView listView;
private LinearLayout lin;
private ImageView img_add;
private SimpleCursorAdapter mCursorAdapter;
private View view;@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {getLoaderManager().initLoader(0, null, this);view = inflater.inflate(R.layout.zixuan_fragment, null);initViews(view);initListview(view);return view;
}private void initListview(View view) {listView = (ListView) view.findViewById(R.id.zixuan_listview);mCursorAdapter = new SimpleCursorAdapter(getActivity(), R.layout.item,null, new String[] { MySQLite.COLUMN_NAME },new int[] { R.id.item }, 0);listView.setAdapter(mCursorAdapter);}private void initViews(View v) {lin = (LinearLayout) v.findViewById(R.id.add_content);img_add = (ImageView) v.findViewById(R.id.addImg);img_add.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {startActivity(new Intent(getActivity(), Manager.class));}});
}@Override
public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {return new android.support.v4.content.CursorLoader(getActivity(),ContentController.uri,new String[]{MySQLite.COLUMN_ID,MySQLite.COLUMN_NAME}, null, null, null);
}@Override
public void onLoadFinished(Loader<Cursor> arg0, Cursor cursor) {mCursorAdapter.swapCursor(cursor);}@Override
public void onLoaderReset(Loader<Cursor> arg0) {mCursorAdapter.swapCursor(null);
}

}