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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 static String getContact(Context context, String phoneNumber) {
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if(sContactCache == null) { //如果缓存为空则创建一个新的 HashMap
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sContactCache = new HashMap<String, String>();
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}
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if(sContactCache.containsKey(phoneNumber)) { //如果缓存中已存在对应的电话号码则返回其对应的联系人姓名
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return sContactCache.get(phoneNumber);
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}
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//否则根据电话号码查询联系人姓名
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String selection = CALLER_ID_SELECTION.replace("+",
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PhoneNumberUtils.toCallerIDMinMatch(phoneNumber)); //将 "+" 替换为待查询电话号码的最小完全匹配
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Cursor cursor = context.getContentResolver().query(
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Data.CONTENT_URI, //uri为ContentProvider提供的数据查询接口的位置(Data.CONTENT_URI)
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new String [] { Phone.DISPLAY_NAME }, //需要查询的数据项，查询联系人姓名
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selection, //查询条件
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new String[] { phoneNumber }, //占位符对应的实际参数
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null); //排序方式为空
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if (cursor != null && cursor.moveToFirst()) { //如果查询结果非空，获取查询结果中的第一条记录
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try {
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String name = cursor.getString(0); //获取联系人姓名
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sContactCache.put(phoneNumber, name); //将电话号码及其联系人姓名加入 HashMap 缓存中
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return name; //返回联系人姓名
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} catch (IndexOutOfBoundsException e) { //处理异常
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Log.e(TAG, " Cursor get string error " + e.toString());
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return null; //返回null
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} finally {
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cursor.close(); //释放cursor
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}
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} else { //如果返回为空，打印调试信息并返回null
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Log.d(TAG, "No contact matched with number:" + phoneNumber);
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return null; //返回null
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}
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}
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