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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;//定义包名
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import android.content.Context;//导入Context类，用于访问应用环境
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import android.database.Cursor;// 导入 Cursor 类，用于操作查询结果
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import android.provider.ContactsContract.CommonDataKinds.Phone;// 导入电话常量
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import android.provider.ContactsContract.Data;// 导入数据常量
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import android.telephony.PhoneNumberUtils;// 导入电话工具类
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import android.util.Log; // 导入日志工具类
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import java.util.HashMap;// 导入 HashMap 类，用于存储联系人缓存
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public class Contact { // 定义 Contact 类
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private static HashMap<String, String> sContactCache;
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// 静态 HashMap 用于缓存联系人姓名
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private static final String TAG = "Contact";
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// 日志标签，用于标识日志信息
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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 = '+')"; // 查询选项字符串，用于匹配来电显示的电话号码
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//根据电话号码获取联系人姓名的方法
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public static String getContact(Context context, String phoneNumber) {
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//初始化联系人缓存
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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//如果缓存中已存在该电话号码，则直接返回对应的联系人姓名
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if(sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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//替换查询字符串中的“+”，使用电话号码的最小匹配形式
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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//执行内容解析器查询，获取与电话号码匹配的联系人姓名
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Cursor cursor = context.getContentResolver().query(
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//查询的 UIR
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Data.CONTENT_URI,
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//查询的列，这里只查询显示姓名
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new String [] { Phone.DISPLAY_NAME },
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//查询条件
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selection,
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//查询参数
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new String[] { phoneNumber },
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//排序方式
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null);
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//检查游标是否有效，并尝试移动到第一条记录
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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
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String name = cursor.getString(0);
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//将联系人的电话号码和姓名存入缓存
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sContactCache.put(phoneNumber, name);
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//返回联系人姓名
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return name;
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}
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//捕获索引越界异常
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catch (IndexOutOfBoundsException e) {
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// 记录错误日志
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Log.e(TAG, " Cursor get string error " + e.toString());
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// 返回 null
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return null;
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} finally {
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// 确保游标被关闭以释放资源
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cursor.close();
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}
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} else { // 如果没有找到匹配的联系人
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// 记录调试日志
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Log.d(TAG, "No contact matched with number:" + phoneNumber);
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// 返回 null
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return null;
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}
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}
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}
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