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xiaomi/Contact.java

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/*
* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.micode.notes.data; // 声明该类所在的包
import android.content.Context; // 导入用于访问应用程序上下文的类
import android.database.Cursor; // 导入用于处理数据库查询结果的类
import android.provider.ContactsContract.CommonDataKinds.Phone; // 导入与联系人电话号码相关的类
import android.provider.ContactsContract.Data; // 导入与联系人数据相关的类
import android.telephony.PhoneNumberUtils; // 导入用于处理电话号码的工具类
import android.util.Log; // 导入用于日志记录的类
import java.util.HashMap; // 导入用于创建键值对映射的哈希表类
// 定义一个名为Contact的类用于处理联系人相关的操作
public class Contact {
// 声明一个静态的HashMap用于缓存联系人电话号码和对应的姓名
private static HashMap<String, String> sContactCache;
// 定义一个静态的字符串常量,用于日志记录的标签
private static final String TAG = "Contact";
// 定义一个SQL查询条件字符串用于查询联系人姓名
private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
+ ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
+ " AND " + Data.RAW_CONTACT_ID + " IN "
+ "(SELECT raw_contact_id "
+ " FROM phone_lookup"
+ " WHERE min_match = '+')";
// 定义一个静态方法,用于根据电话号码获取联系人姓名
public static String getContact(Context context, String phoneNumber) {
// 如果联系人缓存为空则创建一个新的HashMap
if (sContactCache == null) {
sContactCache = new HashMap<String, String>();
}
// 如果缓存中已经包含该电话号码对应的联系人姓名,则直接返回
if (sContactCache.containsKey(phoneNumber)) {
return sContactCache.get(phoneNumber);
}
// 根据传入的电话号码,替换查询条件中的占位符
String selection = CALLER_ID_SELECTION.replace("+",
PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
// 使用ContentResolver查询联系人数据
Cursor cursor = context.getContentResolver().query(
Data.CONTENT_URI, // 联系人数据的URI
new String[]{Phone.DISPLAY_NAME}, // 需要查询的列,这里只查询显示名称
selection, // 查询条件
new String[]{phoneNumber}, // 查询条件中的参数值
null); // 排序方式这里为null表示不排序
// 如果查询结果不为空且游标可以移动到第一行
if (cursor!= null && cursor.moveToFirst()) {
try {
// 从查询结果中获取联系人的显示名称
String name = cursor.getString(0);
// 将电话号码和对应的联系人姓名存入缓存
sContactCache.put(phoneNumber, name);
// 返回联系人姓名
return name;
} catch (IndexOutOfBoundsException e) {
// 如果在获取字符串时发生索引越界异常,记录错误日志
Log.e(TAG, " Cursor get string error " + e.toString());
return null;
} finally {
// 无论是否发生异常,最终都要关闭游标以释放资源
cursor.close();
}
} else {
// 如果没有找到匹配的联系人,记录调试日志
Log.d(TAG, "No contact matched with number:" + phoneNumber);
return null;
}
}
}