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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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public class Contact {
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private static HashMap<String, String> sContactCache; // 静态HashMap用于缓存联系人信息
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private static final String TAG = "Contact"; // 用于日志记录的标签
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// 这是一个SQL查询片段，用于在联系人数据库中查找与给定电话号码匹配的联系人
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// 此查询片段使用了PHONE_NUMBERS_EQUAL函数来匹配电话号码，并检查MIME类型是否为联系人类型
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// 然后，它使用子查询从phone_lookup表中选择具有最佳匹配的raw_contact_id
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// 请注意，这里的"?"是一个参数占位符，用于在执行查询时插入实际的电话号码
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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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* 根据电话号码从联系人数据库中获取联系人的姓名，并缓存结果。
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*
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* @param context 当前应用的上下文，用于访问内容解析器。
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* @param phoneNumber 要查询的电话号码。
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* @return 匹配电话号码的联系人姓名，如果未找到匹配项或发生错误，则返回null。
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*/
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public static String getContact(Context context, String phoneNumber) {
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// 检查缓存是否已初始化，如果未初始化，则进行初始化
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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// 检查缓存中是否已经存在该电话号码的联系人姓名
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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CALLER_ID_SELECTION中的占位符"+"为实际的电话号码匹配最小值
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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// 使用内容解析器查询联系人数据库
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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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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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// 如果Cursor中没有预期的列，则记录错误并返回null
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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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} 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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