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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; //声明该类属于net.micode.notes.data包
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import android.content.Context; //导入Context类，用于获取应用的上下文
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import android.database.Cursor; //导入Cursor类，用于处理数据库查询的结果
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import android.provider.ContactsContract.CommonDataKinds.Phone; //导入Phone类，访问联系人相关信息
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import android.provider.ContactsContract.Data; //导入Data类，用于访问数据表
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import android.telephony.PhoneNumberUtils; //导入PhoneNumberUtils类，用于处理电话号码
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import android.util.Log; //导入Log类，用于输出日志
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import java.util.HashMap; //导入HashMap类，用于存储电话号码和联系人名称的缓存
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public class Contact { //定义一个名为Contact的类
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private static HashMap<String, String> sContactCache; //定义一个静态的HashMap，用于缓存电话号码和对应的联系人名称
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private static final String TAG = "Contact"; //定义日志标记
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//定义一个常量字符串，用于查询符合条件的联系人
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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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//定义一个静态方法，用于获取联系人名称
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public static String getContact(Context context, String phoneNumber) {
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//如果缓存为空，则初始化缓存
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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//如果缓存中已经存在该电话号码的联系人，则直接返回缓存中的值
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if(sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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//使用PhoneNumberUtils将电话号码格式化为最小匹配格式
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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//通过ContentResolver执行查询操作，查询联系人表中的名称
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Cursor cursor = context.getContentResolver().query(
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Data.CONTENT_URI, //查询Data内容提供者
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new String [] { Phone.DISPLAY_NAME }, //查询显示名称字段
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selection, //查询条件
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new String[] { phoneNumber }, //查询参数，即电话号码
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null); //排序条件为空
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//如果查询结果不为空且有数据
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if (cursor != null && cursor.moveToFirst()) {
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try {
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//获取联系人名称
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String name = cursor.getString(0);
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//将电话号码和联系人名称缓存到HashMap中
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sContactCache.put(phoneNumber, name);
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return name; //返回联系人名称
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} catch (IndexOutOfBoundsException e) { //如果获取数据失败
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Log.e(TAG, " Cursor get string error " + e.toString()); //输出错误日志
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return null; //返回null表示未找到联系人
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} finally { //确保查询完成后关闭游标
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cursor.close();
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}
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} else { //如果没有找到联系人
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Log.d(TAG, "No contact matched with number:" + phoneNumber); //输出日志表示没有找到匹配的联系人
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return null; //返回null表示未找到联系人
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}
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}
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}
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