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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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*
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* @Package: net.micode.notes.data
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* @ClassName: Contact
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* @Description: 通过传入的电话号码获取对应的姓名
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*/
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public class Contact {
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//哈希图型变量sContactCache，用于存储联系人姓名和电话号码的映射关系
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private static HashMap<String, String> sContactCache;
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private static final String TAG = "Contact";
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/**
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* 查找联系人的sql语句:
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* 执行过程：从phone_lookup中查询符合最小匹配值的raw_contact_id，在data表里找到raw_contact_id，选择电话号码类型，并与传入的电话号码进行精确匹配
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*/
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private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER + ",?) AND " + Data.MIMETYPE
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+ "='" + Phone.CONTENT_ITEM_TYPE + "'" + " AND " + Data.RAW_CONTACT_ID + " IN " + "(SELECT raw_contact_id "
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+ " FROM phone_lookup" + " WHERE min_match = '+')";
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/**
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* @method getContact
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* @description 通过传入的电话号码获取对应的姓名
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* @param context 上下文
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* @param phoneNumber 传入的电话号码
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* @return string 姓名
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*/
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public static String getContact(Context context, String phoneNumber) {
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//初始化 sContactCache
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if (sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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//通过电话号码查找sContactCache，如果命中，直接返回对应的姓名
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if (sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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//selection:将CALLER_ID_SELECTION中的“+”替换成实际电话号码的最小匹配字符串
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String selection = CALLER_ID_SELECTION.replace("+", PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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/**查询数据库，返回光标
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* 数据库表：Data.CONTENT_URI
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* 查找的列：Phone.DISPLAY_NAME 只显示名称
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* 查找的sql语句：selection
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* 替换掉占位符“？”：phoneNumber
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* 排序方式：不排序
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*/
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Cursor cursor = context.getContentResolver().query(Data.CONTENT_URI, new String[]{Phone.DISPLAY_NAME},
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selection, new String[]{phoneNumber}, null);
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//如果光标不为空且移到第一行，即已在数据库中查询到
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if (cursor != null && cursor.moveToFirst()) {
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//获取联系人姓名 并将电话号码和联系人姓名的映射关系存到sContactCache中 返回姓名
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try {
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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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}
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//异常处理
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catch (IndexOutOfBoundsException e) {
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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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}
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//如果未在数据库中查询到，则记录错误日志
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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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