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MINotes/Contact.java

102 lines
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`Contact.java`
```java
/*
* 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;
import android.content.Context;
import android.database.Cursor;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.Data;
import android.telephony.PhoneNumberUtils;
import android.util.Log;
import java.util.HashMap;
/**
* 联系人工具类,用于根据电话号码查询联系人名称。
*/
public class Contact {
// 用于缓存联系人信息的HashMap避免重复查询。
private static HashMap<String, String> sContactCache;
// 日志标签,用于标识日志输出的来源。
private static final String TAG = "Contact";
// 用于查询联系人的SQL语句模板。
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 = '+')";
/**
* 根据电话号码查询联系人名称。
*
* @param context 上下文对象,用于访问系统服务。
* @param phoneNumber 需要查询的电话号码。
* @return 返回联系人名称如果未找到则返回null。
*/
public static String getContact(Context context, String phoneNumber) {
// 如果缓存未初始化则初始化HashMap。
if(sContactCache == null) {
sContactCache = new HashMap<String, String>();
}
// 如果电话号码已在缓存中,直接返回缓存的联系人名称。
if(sContactCache.containsKey(phoneNumber)) {
return sContactCache.get(phoneNumber);
}
// 替换SQL语句模板中的占位符以匹配输入的电话号码。
String selection = CALLER_ID_SELECTION.replace("+",
PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
// 执行查询操作,获取联系人名称。
Cursor cursor = context.getContentResolver().query(
Data.CONTENT_URI,
new String [] { Phone.DISPLAY_NAME },
selection,
new String[] { phoneNumber },
null);
// 如果查询结果不为空且至少有一条记录。
if (cursor != null && cursor.moveToFirst()) {
try {
// 从游标中获取联系人名称,并放入缓存。
String name = cursor.getString(0);
sContactCache.put(phoneNumber, name);
return name;
} catch (IndexOutOfBoundsException e) {
// 如果发生索引越界异常,记录错误日志。
Log.e(TAG, " Cursor get string error " + e.toString());
return null;
} finally {
// 关闭游标,释放资源。
cursor.close();
}
} else {
// 如果未找到匹配的联系人记录日志并返回null。
Log.d(TAG, "No contact matched with number:" + phoneNumber);
return null;
}
}
}
```