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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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//联系人数据库
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/*hashmap是一系列的键-值队（以键查找值），hashmap的特点是：无序，键不重复 <String,String>是泛型的概念，这里意思是，键是字符串，值也是字符串*/
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private static HashMap<String, String> sContactCache;//创建实体类来存储所写联系人信息
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private static final String TAG = "Contact";//定义该类的名称
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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 = '+')";//在数据库中查找电话号码
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public static String getContact(Context context, String phoneNumber) {
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if(sContactCache == null) {
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//创建实体类缓存列表
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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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//如果在数据库中包含此键值则返回电话号码
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return sContactCache.get(phoneNumber);
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}
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//toCallerIDMinMatch是安卓自带的号码匹配工具，截取查询号码的后7位作为匹配依据
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
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//cursor类是对数据库的操作，获取整行的数据，从数据库中查询联系人内容
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Cursor cursor = context.getContentResolver().query(
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Data.CONTENT_URI,//数据储存的地址
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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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//若数据库存在，则游标移动到游标所表示的信息元组的第一行开始
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try {
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String name = cursor.getString(0);
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sContactCache.put(phoneNumber, name);//把找到的联系人电话和名字移到缓存列表中
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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());//异常处理
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return null;
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} finally {
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cursor.close();//关闭数据库的访问
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}
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} else {
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//数据库不存在或没找到此联系电话
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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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