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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;//属于data这个包
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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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* @Package: net.micode.notes.data
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* @ClassName: Contact
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* @Description:
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* Contact类用于查询联系人信息并进行缓存。
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* 该类包含一个静态的HashMap作为缓存，存储电话号码和对应的联系人名字。
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* 通过调用getContact方法可以根据给定的电话号码查询联系人名字。
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* 如果缓存中已经存在该电话号码对应的联系人名字，则直接返回缓存中的结果，否则通过查询数据库获取联系人名字并更新缓存。
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* 该类还定义了一个私有的SQL筛选语句用于查询联系人信息。
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* 注意：该类是线程不安全的，如果需要在多线程环境下使用，请做好同步控制
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* @Author: YangYizhe
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* @CreateDate: 12/17/2023 10:10 AM
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* @Version: 1.0
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*/
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public class Contact {
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/**
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* 作为缓存,存储电话号码和对应的联系人名字
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*/
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private static HashMap<String, String> sContactCache;
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private static final String TAG = "Contact";//设置日志TAG标签
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//查询联系人的SQL筛选语句
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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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//获取联系人
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public static String getContact(Context context, String phoneNumber) {
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if(sContactCache == null) {/*如果缓存为空，就新建一个*/
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sContactCache = new HashMap<String, String>();
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}
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if(sContactCache.containsKey(phoneNumber)) {/*如果缓存中已经有该电话号码对应的联系人名字，就直接返回*/
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return sContactCache.get(phoneNumber);
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}
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));//将电话号码转换为最小匹配模式，用于筛选
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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,//使用筛选条件
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new String[] { phoneNumber },
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null);
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if (cursor != null && cursor.moveToFirst()) {//如果找到了符合条件的联系人
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try {
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String name = cursor.getString(0);//获取联系人名字
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sContactCache.put(phoneNumber, name);//将电话号码和联系人名字添加到缓存中
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return name;//返回联系人名字
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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();//关闭游标
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}
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} else {/*没找到*/
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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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