From b7c007a30c9de358c93eebf2c463e61d7a25af77 Mon Sep 17 00:00:00 2001
From: pfe7gr36y <3301904562@qq.com>
Date: Tue, 17 Jun 2025 20:05:25 +0800
Subject: [PATCH] Update Contact.java

---
 java/net/micode/notes/data/Contact.java | 42 ++++++++++++++-----------
 1 file changed, 23 insertions(+), 19 deletions(-)

diff --git a/java/net/micode/notes/data/Contact.java b/java/net/micode/notes/data/Contact.java
index d97ac5d..0e411fb 100644
--- a/java/net/micode/notes/data/Contact.java
+++ b/java/net/micode/notes/data/Contact.java
@@ -25,47 +25,51 @@ import android.util.Log;
 
 import java.util.HashMap;
 
-public class Contact {
-    private static HashMap<String, String> sContactCache;
+public class Contact {// 联系人缓存，用于存储电话号码和对应姓名的映射关系
+    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
+    // 用于查找与给定电话号码匹配的联系人
     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 = '+')";
-
-    public static String getContact(Context context, String phoneNumber) {
+//根据电话号码获取联系人姓名
+     //* @param context 上下文对象
+     //* @param phoneNumber 要查询的电话号码
+     //* @return 联系人的姓名，如果找不到则返回null
+    public static String getContact(Context context, String phoneNumber) {// 如果缓存为空，则初始化
         if(sContactCache == null) {
-            sContactCache = new HashMap<String, String>();
+            sContactCache = new HashMap<String, String>();// 如果缓存中已有该号码的姓名，直接返回
         }
 
-        if(sContactCache.containsKey(phoneNumber)) {
+        if(sContactCache.containsKey(phoneNumber)) {// 替换选择语句中的最小匹配参数
             return sContactCache.get(phoneNumber);
         }
 
         String selection = CALLER_ID_SELECTION.replace("+",
-                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));// 查询联系人数据库
         Cursor cursor = context.getContentResolver().query(
-                Data.CONTENT_URI,
-                new String [] { Phone.DISPLAY_NAME },
-                selection,
-                new String[] { phoneNumber },
-                null);
-
+                Data.CONTENT_URI, // 数据URI
+                new String [] { Phone.DISPLAY_NAME },// 要查询的列（显示名称）
+                selection,// 选择条件
+                new String[] { phoneNumber }, // 选择参数
+                null);// 排序方式（无）
+// 处理查询结果
         if (cursor != null && cursor.moveToFirst()) {
-            try {
-                String name = cursor.getString(0);
+            try {// 获取第一行第一列的联系人姓名
+                String name = cursor.getString(0);// 将结果存入缓存
                 sContactCache.put(phoneNumber, name);
                 return name;
-            } catch (IndexOutOfBoundsException e) {
+            } catch (IndexOutOfBoundsException e) {// 处理数组越界异常
                 Log.e(TAG, " Cursor get string error " + e.toString());
                 return null;
-            } finally {
+            } finally {// 确保关闭Cursor
                 cursor.close();
             }
-        } else {
+        } else {// 没有找到匹配的联系人
             Log.d(TAG, "No contact matched with number:" + phoneNumber);
             return null;
         }