diff --git a/Contact.java b/Contact.java
deleted file mode 100644
index f0fccea..0000000
--- a/Contact.java
+++ /dev/null
@@ -1,81 +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;
-
-public class Contact {             //缓存联系人信息的HashMap，键为电话号码，值为联系人姓名
-    private static HashMap<String, String> sContactCache;  //日志标签
-    private static final String TAG = "Contact";       //查询联系人信息的SQL选择语句模板  
-
-    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 = '+')";
-    
-    /*
-     * 根据电话号码获取联系人姓名
-     * @param context  上下文对象
-     * @param phoneNumber  电话号码
-     * @return 联系人姓名，如果未找到则返回null
-     */
-
-    public static String getContact(Context context, String phoneNumber) {   //初始化缓存
-        if(sContactCache == null) {
-            sContactCache = new HashMap<String, String>();
-        }
-    //如果缓存中存在该电话号码对应的联系人姓名，直接返回
-        if(sContactCache.containsKey(phoneNumber)) {
-            return sContactCache.get(phoneNumber);
-        }
-    //替换SQL选择语句中的占位符
-        String selection = CALLER_ID_SELECTION.replace("+",
-                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
-    //查询联系人信息
-        Cursor cursor = context.getContentResolver().query(
-                Data.CONTENT_URI,
-                new String [] { Phone.DISPLAY_NAME },  //查询联系人显示名称
-                selection,
-                new String[] { phoneNumber },  //查询参数
-                null);
-    //如果查询不为空且有数据
-        if (cursor != null && cursor.moveToFirst()) {
-            try {    //获取联系人姓名
-                String name = cursor.getString(0);  //将联系人信息存入缓存
-                sContactCache.put(phoneNumber, name);
-                return name;
-            } catch (IndexOutOfBoundsException e) {  //捕获并记录异常
-                Log.e(TAG, " Cursor get string error " + e.toString());
-                return null;
-            } finally {    //关闭游标
-                cursor.close();
-            }
-        } else {    //记录未找到联系人的日志
-            Log.d(TAG, "No contact matched with number:" + phoneNumber);
-            return null;
-        }
-    }
-}