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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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/**
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* 文件: Contact.java
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* 描述: 提供联系人相关功能的工具类，主要用于通过电话号码查询联系人姓名
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* 作用: 在便签应用中，当用户创建通话记录便签时，需要显示联系人姓名而不仅仅是电话号码
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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
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*
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* 提供通过电话号码查询联系人姓名的功能，使用缓存机制提高查询效率
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*/
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public class Contact {
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/** 联系人缓存，键为电话号码，值为联系人姓名 */
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private static HashMap<String, String> sContactCache;
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/** 日志标签 */
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private static final String TAG = "Contact";
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/**
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* SQL查询条件，用于通过电话号码查询联系人
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* 使用PHONE_NUMBERS_EQUAL函数比较电话号码
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* 限制MIMETYPE为电话类型
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* 通过phone_lookup表的min_match字段进行匹配
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*/
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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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* 通过电话号码获取联系人姓名
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*
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* @param context 上下文环境，用于访问ContentResolver
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* @param phoneNumber 需要查询的电话号码
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* @return 联系人姓名，如果未找到则返回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（如果需要）
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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// 检查缓存中是否已有该号码对应的联系人
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if(sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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// 替换SQL查询条件中的占位符，转换电话号码为标准格式
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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// 执行查询，获取联系人姓名
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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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// 获取联系人姓名并存入缓存
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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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// 处理索引越界异常
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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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// 确保关闭游标，释放资源
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cursor.close();
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}
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} else {
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// 未找到匹配的联系人
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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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