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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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//表示在哪个包，相应的依赖关系
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package net.micode.notes.data;
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//导入android自带的Context类
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import android.content.Context;
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//从数据库导入cursor，表示数据库中的每行数据下标
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import android.database.Cursor;
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//android系统应用开发框架功能之一，提供访问android内容提供者的类。导入里面联系人的号码，这个是需要CommonDataKinds提供权限
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import android.provider.ContactsContract.CommonDataKinds.Phone;
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//导入Data，包含通讯录中的每个人的全部信息。
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import android.provider.ContactsContract.Data;
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//1.Telephony 服务为电话应用程序编程接口 (TAPI) 提供支持。通过使用此硬件，您可以通过直接连接到本地计算机、电话线、LAN、WAN 和 Internet 以进行通信。提供处理Phone Number的各种应用工具
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import android.telephony.PhoneNumberUtils;
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//安卓的日志类工具，方便后面调试使用
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import android.util.Log;
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//引用了STL里面的HashMap，用来映射联系人和电话号码
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import java.util.HashMap;
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//change
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public class Contact { //联系人类
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private static HashMap<String, String> sContactCache;
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//写入Cache，而创建的一个成员变量
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private static final String TAG = "Contact";
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//在日志中查看由哪个类打印的日志
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// 定义字符串CALLER_ID_SELECTION，表示为每个用户存储了相应的信息，当插入新的用户时，系统会检查系统中是否已存在用户
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private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL("
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+ Phone.NUMBER + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'" + " AND " + Data.RAW_CONTACT_ID + " IN " + "(SELECT raw_contact_id " + " FROM phone_lookup" + " WHERE min_match = '+')";
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// 获取联系人
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/**
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* 本方法用于根据传入参数获取联系人信息
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*
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* @param context
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* @param phoneNumber
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* @return
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*/
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public static String getContact(Context context, String phoneNumber) {
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//判断联系人cache是否为空，如果为空，则初始化一个cache
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if (sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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// 查找HashMap中是否已有对应联系人phoneNumber信息
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if (sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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// 修改原先数据库语句Caller_ID_SELECTION，用函数形参phonenumber的后七位电话号码代替"+"
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String selection = CALLER_ID_SELECTION.replace("+", PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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//从数据库中读取数据，query是查询方法。cursor类是对数据库的操作，获取整行的数据.Ressolver是对联系人内容的读取，其中provider提供了联系人数据
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Cursor cursor = context.getContentResolver().query(Data.CONTENT_URI,//uri是区别provider的标志
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new String[]{Phone.DISPLAY_NAME},
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//该参数告诉provider要返回的内容，这里是要返回联系人的名字
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selection,
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//该参数相当于数据库中where条件，筛选只拥有特定电话号码的信息
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new String[]{phoneNumber},
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//筛选条件，即参数phonenumber
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null);
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//设置查询是否按顺序排列，这里的意思是不按顺序排列
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/**
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* 判断上面的查询是否查到相关信息，如果查询到将查询到的数据移动到第一行
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* 如果没有查询到相关信息，就写入日志
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*/
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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，写入联系人缓存
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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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// 异常
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} catch (IndexOutOfBoundsException e) {
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// 将异常信息写入日志
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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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cursor.close();
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}
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// 未找到相关信息就写入日志
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} else {
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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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