BaseColumns以及自定义Column

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;    }

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