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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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/*这段代码是一个用于获取联系人信息的工具类。主要功能是根据电话号码查询对应的联系人名称。*/
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package net.micode.notes.data;
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/**/
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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;
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/*sContactCache是一个哈希映射，缓存已经查询过的联系人*/
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private static final String TAG = "Contact";
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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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public static String getContact(Context context, String phoneNumber) {
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if(sContactCache == null) {
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sContactCache = new HashMap<String, String>();
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}
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if(sContactCache.containsKey(phoneNumber)) {
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return sContactCache.get(phoneNumber);
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}
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/*检查是否包含了需要查询的变量*/
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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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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/*如果sContactCache中不包含该电话号码，则构建查询条件selection，将电话号码转换为最小匹配模式，并替换查询语句中的占位符。
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*/
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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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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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/*接下来通过内容解析器ContentResolver查询联系人数据表Data.CONTENT_URI，查询列为联系人名称Phone.DISPLAY_NAME。
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查询条件为电话号码与查询语句中的电话号码相等，并且数据类型为电话号码类型。
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如果查询结果不为空且移动到第一条记录，则从查询结果中获取联系人名称，并将电话号码和联系人名称存入sContactCache中。
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最后关闭查询结果的游标并返回联系人名称。*/
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}
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/*该类中的方法getContact()接受一个上下文Context和一个电话号码phoneNumber作为参数，返回与该电话号码相关联的联系人名称。*/
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}
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