diff --git a/src/data/Contact.java b/src/data/Contact.java
deleted file mode 100644
index dcf2f1f..0000000
--- a/src/data/Contact.java
+++ /dev/null
@@ -1,84 +0,0 @@
-/*
- * 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;
-
-//联系人管理类，用于获取手机联系人的信息
-public class Contact {
-    private static HashMap<String, String> sContactCache;
-    private static final String TAG = "Contact";
-
-    //定义字符串CALLER_ID_SELECTION
-    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 = '+')";
-
-    //获取指定手机号码对应的联系人的姓名
-    public static String getContact(Context context, String phoneNumber) {
-        //查找HashMap中是否已有phoneNumber信息
-        //是否存在该手机号码的联系人信息
-        if(sContactCache == null) {
-            sContactCache = new HashMap<String, String>();//如果没有，则根据给定的号码查询系统数据库，获取联系人姓名
-        }
-
-        if(sContactCache.containsKey(phoneNumber)) {
-            return sContactCache.get(phoneNumber);//如果有，那就直接返回缓存结果就可以了
-        }
-
-        //查找数据库中phoneNumber的信息
-        //查询联系人名CALLER_ID_SELECTION
-        String selection = CALLER_ID_SELECTION.replace("+",
-                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
-        Cursor cursor = context.getContentResolver().query(//ContentResolver对象查询数据，将结果给cursor对象
-                Data.CONTENT_URI,
-                new String [] { Phone.DISPLAY_NAME },
-                selection,
-                new String[] { phoneNumber },
-                null);
-
-        //判定查询结果，moveToFirst()返回第一条
-        if (cursor != null && cursor.moveToFirst()) {//如果查询成功且不为空，
-            try {
-                //找到相关信息
-                String name = cursor.getString(0);//那么就从cursor中获取联系人的姓名
-                sContactCache.put(phoneNumber, name);//并且存入sContactCache中作为缓存
-                return name;
-                //找到异常
-            } catch (IndexOutOfBoundsException e) {
-                Log.e(TAG, " Cursor get string error " + e.toString());
-                return null;
-            } finally {
-                cursor.close();
-            }
-            //未找到相关信息
-        } else {
-            Log.d(TAG, "No contact matched with number:" + phoneNumber);
-            return null;//查询失败或者没有结果，那么就返回空值null
-        }
-    }
-}