ADD file via upload

src/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;
+
+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，用于通过电话号码查询联系人姓名，并支持缓存机制
+ */
+public class Contact {
+    // 联系人缓存（电话号码 -> 联系人姓名）
+
+    private static HashMap<String, String> sContactCache;
+    private static final String TAG = "Contact"; // 日志标签
+
+    // 查询条件模板，用于匹配电话号码对应的联系人
+    private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER// 电话号码匹配函数
+
+            + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'" // 限制为电话类型数据
+
+            + " AND " + Data.RAW_CONTACT_ID + " IN "
+            + "(SELECT raw_contact_id "  // 原始联系人ID筛选
+
+            + " FROM phone_lookup"
+            + " WHERE min_match = '+')"; // 匹配最小匹配规则
+
+
+
+
+    /**
+     * 通过电话号码获取联系人姓名（带缓存）
+     * @param context 上下文对象
+     * @param phoneNumber 要查询的电话号码
+     * @return 对应的联系人姓名，未找到返回null
+     */
+    public static String getContact(Context context, String phoneNumber) {
+        // 初始化缓存（首次调用时）
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+        // 缓存命中直接返回
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+        // 动态构建查询条件（替换模板中的占位符）
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+        // 执行内容提供者查询
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,  // 查询URI（联系人数据表）
+                new String [] { Phone.DISPLAY_NAME },// 查询字段（显示名称）
+                selection,// 筛选条件
+                new String[] { phoneNumber },// 参数占位符值
+
+                null);   // 排序方式
+        // 处理查询结果
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                // 获取第一条结果的显示名称
+                String name = cursor.getString(0);
+                sContactCache.put(phoneNumber, name);// 存入缓存
+                return name;
+            } catch (IndexOutOfBoundsException e) {
+                // 异常处理（列索引越界）
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;
+            } finally {
+                // 确保关闭游标释放资源
+                cursor.close();
+            }
+        } else {
+            // 未找到匹配联系人
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+    }
+}