From d5cba8d4746fb59a173c150696c3b53ad3289f04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=BD=95=E6=80=9D=E6=BA=90?= <1308063943@qq.com>
Date: Sun, 29 Jun 2025 20:59:07 +0800
Subject: [PATCH] data/Contact.java

---
 .../java/net/micode/notes/data/Contact.java   | 41 ++++++++++++++++++-
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/net/micode/notes/data/Contact.java b/app/src/main/java/net/micode/notes/data/Contact.java
index d97ac5d..88d54ef 100644
--- a/app/src/main/java/net/micode/notes/data/Contact.java
+++ b/app/src/main/java/net/micode/notes/data/Contact.java
@@ -25,28 +25,59 @@ import android.util.Log;
 
 import java.util.HashMap;
 
+/**
+ * 联系人信息处理类
+ * 提供根据电话号码获取联系人名称的功能
+ */
 public class Contact {
+    /**
+     * 缓存联系人信息的哈希表
+     * 键：电话号码
+     * 值：联系人名称
+     */
     private static HashMap<String, String> sContactCache;
+
+    /**
+     * 日志标签
+     */
     private static final String TAG = "Contact";
 
+    /**
+     * 查询联系人的SQL条件语句
+     * 用于匹配电话号码并获取联系人名称
+     * 使用PHONE_NUMBERS_EQUAL函数进行模糊匹配
+     * 并限制MIME类型为Phone.CONTENT_ITEM_TYPE
+     * 同时限定RAW_CONTACT_ID在phone_lookup表中min_match为'+'的记录
+     */
     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 "
+            + ",?) 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名称
+     * @param context 应用程序上下文
+     * @param phoneNumber 电话号码
+     * @return 联系人名称，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>();
         }
 
+        // 如果缓存中已存在该电话号码对应的联系人名称，则直接返回
         if(sContactCache.containsKey(phoneNumber)) {
             return sContactCache.get(phoneNumber);
         }
 
+        // 构建查询条件，将电话号码转换为最小匹配格式
         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 },
@@ -54,18 +85,24 @@ public class Contact {
                 new String[] { phoneNumber },
                 null);
 
+        // 处理查询结果
         if (cursor != null && cursor.moveToFirst()) {
             try {
+                // 获取联系人名称
                 String name = cursor.getString(0);
+                // 将结果缓存
                 sContactCache.put(phoneNumber, name);
                 return name;
             } catch (IndexOutOfBoundsException e) {
+                // 捕获索引越界异常并记录日志
                 Log.e(TAG, " Cursor get string error " + e.toString());
                 return null;
             } finally {
+                // 关闭游标
                 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;
         }