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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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////用于缓存联系人姓名和对应的电话号码
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private static HashMap<String, String> sContactCache;
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private static final String TAG = "Contact";
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//查询电话号码和联系人关联的数据表和列
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private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL("
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+ 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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* 获取给定电话号码对应的联系人姓名
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*
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* @param context 上下文，用于访问数据
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* @param phoneNumber 需要查询的电话号码
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* @return 给定电话号码对应的联系人姓名，若查询失败则返回null
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*/
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public static String getContact(Context context, String phoneNumber) {
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//如果联系人信息的缓存未创建，则先创建缓存
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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//如果该电话号码的联系人姓名已经在缓存中，直接返回联系人姓名
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if(sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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//构建查询表达式，查找号码对应的联系人
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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//查询数据
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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 },//需要查询的列，即联系人姓名
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selection,//查询表达式
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new String[] { phoneNumber },//查询表达式中需要的参数，即要查询的电话号码
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null);//不需要排序
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if (cursor != null && cursor.moveToFirst()) {
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try {
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String name = cursor.getString(0);//获取查询结果的第一列，即联系人姓名
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sContactCache.put(phoneNumber, name);//将查询结果缓存起来，便于下次查询时直接使用缓存
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return name;
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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;//若查询结果的第一列不是联系人姓名，返回null
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} finally {
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cursor.close();//关闭数据查询游标
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}
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} else {
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//如果没有查询到联系人信息，记录日志并返回null值
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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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