android provider 包下自带的BaseColumn
/* * Copyright (C) 2006 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.provider; public interface BaseColumns { /** * The unique ID for a row. * <P>Type: INTEGER (long)</P> */ public static final String _ID = "_id"; /** * The count of rows in a directory. * <P>Type: INTEGER</P> */ public static final String _COUNT = "_count"; }
基于basecolumn自定义自己表的Column
public static final class PhoneLabelColumns implements BaseColumns {
//必要的部分 ---begin----- public static final String TABLE = "phone_label"; public static final String COUNT = "count"; public static final String NUMBER = "number"; public static final String LABEL = "label";
//必要的部分 ----end----- private static final String[] PROJECTION = { _ID, // 0 NUMBER, // 1 LABEL, // 2 COUNT, // 3 }; public static int COLUMN_NUMBER = 1; public static final int COLUMN_LABEL = 2; public static final int COLUMN_COUNT = 3; }