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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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* 该类用于根据电话号码从联系人数据库中获取联系人姓名，并对获取结果进行缓存，避免重复查询。
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*/
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public class Contact {
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// 用于缓存电话号码和对应的联系人姓名，避免重复查询联系人数据库
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private static HashMap<String, String> sContactCache;
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// 日志标签，方便调试和日志记录
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private static final String TAG = "Contact";
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// 查询联系人姓名的SQL语句模板，根据电话号码匹配联系人信息
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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 = '+')";
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/**
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* 根据电话号码获取联系人姓名。
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* 如果联系人姓名已缓存，则直接从缓存中获取；否则，查询联系人数据库并将结果缓存。
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*
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* @param context 上下文对象，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 联系人姓名，如果未找到匹配的联系人则返回null
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*/
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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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// 检查缓存中是否已存在该电话号码对应的联系人姓名
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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SQL语句模板中的占位符，生成最终的查询语句
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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// 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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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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// 将电话号码和联系人姓名存入缓存
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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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// 处理游标获取字符串时可能出现的索引越界异常
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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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// 关闭游标，释放资源
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cursor.close();
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}
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} else {
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// 未找到匹配的联系人，记录日志
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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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} |
