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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.data;
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import android.content.Context;
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import android.database.Cursor;
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import android.provider.ContactsContract.CommonDataKinds.Phone;
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import android.provider.ContactsContract.Data;
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import android.telephony.PhoneNumberUtils;
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import android.util.Log;
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import java.util.HashMap;
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/**
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* 联系人工具类 - 提供根据电话号码查询联系人姓名的功能
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* 使用内存缓存避免重复查询，优化性能
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* 基于Android ContactsContract API实现联系人数据库查询
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*/
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public class Contact {
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// 联系人缓存：存储已查询过的电话号码与对应联系人姓名的映射关系
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private static HashMap<String, String> sContactCache;
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private static final String TAG = "Contact";
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// 联系人查询的SQL选择条件模板
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// 1. 使用PHONE_NUMBERS_EQUAL函数比较电话号码（考虑了格式差异）
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// 2. 限定数据类型为Phone类型
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// 3. 通过phone_lookup表进行优化查询
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private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
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+ ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
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+ " AND " + Data.RAW_CONTACT_ID + " IN "
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+ "(SELECT raw_contact_id "
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+ " FROM phone_lookup"
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+ " WHERE min_match = '+')";
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/**
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* 根据电话号码获取联系人姓名
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*
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* @param context 应用上下文，用于访问ContentResolver
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* @param phoneNumber 待查询的电话号码
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* @return 对应的联系人姓名，若未找到则返回null
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*/
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public static String getContact(Context context, String phoneNumber) {
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// 初始化缓存
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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// 优先从缓存获取，提高性能
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if(sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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// 构建查询条件：将电话号码转换为CallerID匹配格式
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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// 执行联系人数据库查询
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Cursor cursor = context.getContentResolver().query(
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Data.CONTENT_URI,
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new String [] { Phone.DISPLAY_NAME },
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selection,
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new String[] { phoneNumber },
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null);
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// 处理查询结果
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if (cursor != null && cursor.moveToFirst()) {
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try {
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// 获取联系人姓名并加入缓存
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String name = cursor.getString(0);
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sContactCache.put(phoneNumber, name);
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return name;
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} catch (IndexOutOfBoundsException e) {
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// 异常处理：查询结果格式错误
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Log.e(TAG, " Cursor get string error " + e.toString());
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return null;
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} finally {
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// 资源释放：确保游标关闭
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cursor.close();
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}
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} else {
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// 未找到匹配联系人
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Log.d(TAG, "No contact matched with number:" + phoneNumber);
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return null;
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}
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}
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}
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