diff --git a/Contact.java b/Contact.java
deleted file mode 100644
index 119de7a..0000000
--- a/Contact.java
+++ /dev/null
@@ -1,91 +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 {
-    // 静态缓存，用于存储已查询过的电话号码对应的联系人姓名
-    private static HashMap<String, String> sContactCache;
-    // 用于日志记录的标签
-    private static final String TAG = "Contact";
-
-    // 查询条件，用于根据电话号码查询联系人姓名
-    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 = '+')";
-
-    /**
-     * 获取电话号码对应的联系人姓名
-     * @param context 应用程序的上下文
-     * @param phoneNumber 要查询的电话号码
-     * @return 返回电话号码对应的联系人姓名，如果找不到则返回null
-     */
-    public static String getContact(Context context, String phoneNumber) {
-        // 初始化缓存
-        if(sContactCache == null) {
-            sContactCache = new HashMap<String, String>();
-        }
-
-        // 如果缓存中已经有该电话号码的联系人信息，直接返回
-        if(sContactCache.containsKey(phoneNumber)) {
-            return sContactCache.get(phoneNumber);
-        }
-
-        // 使用电话号码生成查询条件
-        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 },  // 需要获取的字段，这里是联系人姓名
-                selection,  // 查询条件
-                new String[] { phoneNumber },  // 查询参数，填充到查询条件中
-                null);  // 排序方式，null表示不排序
-
-        // 检查查询结果并返回联系人姓名
-        if (cursor != null && cursor.moveToFirst()) {
-            try {
-                String name = cursor.getString(0);  // 获取查询到的联系人姓名
-                sContactCache.put(phoneNumber, name);  // 将结果缓存起来
-                return name;  // 返回联系人姓名
-            } catch (IndexOutOfBoundsException e) {
-                // 捕捉异常并记录错误日志
-                Log.e(TAG, " Cursor get string error " + e.toString());
-                return null;
-            } finally {
-                // 关闭游标，释放资源
-                cursor.close();
-            }
-        } else {
-            // 如果没有匹配的联系人，记录日志并返回null
-            Log.d(TAG, "No contact matched with number:" + phoneNumber);
-            return null;
-        }
-    }
-}