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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;//当前文件所在的包名
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/*接下来引用android的一些库*/
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import android.content.Context;//调用Android自带的类
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import android.database.Cursor;//从数据库导入Cursor
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import android.provider.ContactsContract.CommonDataKinds.Phone;//导入联系人电话
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import android.provider.ContactsContract.Data;//存储通讯信息
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import android.telephony.PhoneNumberUtils;//格式化用户输入的电话号码
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import android.util.Log;//安卓日志输出工具类
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import java.util.HashMap;//用hashmap存储联系人信息
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public class Contact {//存放联系人信息
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private static HashMap<String, String> sContactCache;//存储联系人及对应的电话号码
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private static final String TAG = "Contact";//定义字符串常量 TAG指向Contact
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private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER//定义 CALLER_ID_SELECTION字符串，用于匹配联系人
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+ ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
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+ " AND " + Data.RAW_CONTACT_ID + " IN "//定义的callerIDSELEDTION所包含的各项数据
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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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/*获取联系人参数Context context内容 phoneNumber和电话号码
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*/
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public static String getContact(Context context, String phoneNumber) {//获取联系人
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if(sContactCache == null) {//如果当前还没有联系人，那么新建一个HashMap存储联系人
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sContactCache = new HashMap<String, String>();//创建哈希表
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}
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if(sContactCache.containsKey(phoneNumber)) {//如果hashmap实例里包含电话号码，则返回电话号码
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return sContactCache.get(phoneNumber);//如果根据电话号码phoneNumber索引到了对应的联系人，那么把对应的联系人的信息返回
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}
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String selection = CALLER_ID_SELECTION.replace("+",//将CALLER_ID_SELECTION的“+”号替代为号码的后MIN_MATCH位
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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Cursor cursor = context.getContentResolver().query(//通过selection的查询语句去数据库查询
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Data.CONTENT_URI,//提供联系人的内容的地址
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new String [] { Phone.DISPLAY_NAME },//返回联系人名字
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selection,//设置条件，相当于whlie
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new String[] { phoneNumber },//get..函数返回字符串类phoneNUmber（手机号码）
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null);//判定查询结果
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if (cursor != null && cursor.moveToFirst()) {// 判断查询结果，如果找到，并且成功返回第一天数据
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try {//得到cursor的第一个字符串name
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String name = cursor.getString(0);//从内容中获取联系人姓名
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sContactCache.put(phoneNumber, name);//将联系人姓名和电话号码写入缓存
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return name;//返回名字
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} catch (IndexOutOfBoundsException e) {//出现异常
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Log.e(TAG, " Cursor get string error " + e.toString());//Log.e为红色，可以想到error错误，这里仅显示红色的错误信息
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return null;
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} finally {//关闭数据库的访问
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cursor.close();//关闭数据库的访问
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}
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} else {//未找到相关信息,返回空指针
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Log.d(TAG, "No contact matched with number:" + phoneNumber);//如果没有找到信息，返回没有匹配到该电话
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return null;//返回空
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}
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}
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}
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