From 2a7bc321fcf8783b245e9ff25aa9944b064442f5 Mon Sep 17 00:00:00 2001
From: dcy <182569992@qq.com>
Date: Sun, 22 Dec 2024 14:30:18 +0800
Subject: [PATCH] =?UTF-8?q?2024/11/30=20=E5=AF=B9contact=E5=8C=85=E6=94=B9?=
 =?UTF-8?q?=E8=BF=9B=E7=BC=93=E5=AD=98=E6=9C=BA=E5=88=B6=E5=B9=B6=E5=8A=A0?=
 =?UTF-8?q?=E6=B3=A8=E8=A7=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/net/micode/notes/data/Contact.java    | 46 +++++++++++++++----
 1 file changed, 36 insertions(+), 10 deletions(-)

diff --git a/src/Notes-master/src/net/micode/notes/data/Contact.java b/src/Notes-master/src/net/micode/notes/data/Contact.java
index f75313a..5fd3378 100644
--- a/src/Notes-master/src/net/micode/notes/data/Contact.java
+++ b/src/Notes-master/src/net/micode/notes/data/Contact.java
@@ -24,50 +24,76 @@ import android.telephony.PhoneNumberUtils;
 import android.util.Log;
 
 import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
 
 public class Contact { //联系人
-    private static HashMap<String, String> sContactCache;
+    // 定义最大缓存数量，可根据实际情况调整，这里假设最多缓存100个联系人信息
+    private static final int MAX_CACHE_SIZE = 100;
+    // 使用LinkedHashMap来实现缓存，它能保持插入顺序，方便后续按顺序清理较旧的缓存项
+    private static LinkedHashMap<String, String> sContactCache;
     private static final String TAG = "Contact";
 
     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 = '+')";
 
+    /**
+     * 根据给定的电话号码获取对应的联系人姓名
+     *
+     * @param context     Android应用上下文，用于访问系统资源，如联系人数据库
+     * @param phoneNumber 要查询对应联系人姓名的电话号码
+     * @return 如果找到对应的联系人，则返回联系人姓名，否则返回null
+     */
     public static String getContact(Context context, String phoneNumber) {
-        if(sContactCache == null) {
-            sContactCache = new HashMap<String, String>();
+        // 初始化缓存，如果缓存还未创建，则创建一个新的LinkedHashMap实例
+        if (sContactCache == null) {
+            sContactCache = new LinkedHashMap<String, String>() {
+                // 重写removeEldestEntry方法，用于定义在何种情况下移除最老的缓存项
+                @Override
+                protected boolean removeEldestEntry(Map.Entry<String, String> eldest) {
+                    // 当缓存的数量大于等于最大缓存数量时，返回true，表示需要移除最老的缓存项
+                    return size() >= MAX_CACHE_SIZE;
+                }
+            };
         }
 
-        if(sContactCache.containsKey(phoneNumber)) {
+        // 先检查缓存中是否已经存在该电话号码对应的联系人姓名
+        if (sContactCache.containsKey(phoneNumber)) {
             return sContactCache.get(phoneNumber);
         }
 
+        // 根据传入的电话号码构建查询条件，替换特定的占位符等
         String selection = CALLER_ID_SELECTION.replace("+",
                 PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
         Cursor cursor = context.getContentResolver().query(
                 Data.CONTENT_URI,
-                new String [] { Phone.DISPLAY_NAME },
+                new String[]{Phone.DISPLAY_NAME},
                 selection,
-                new String[] { phoneNumber },
+                new String[]{phoneNumber},
                 null);
 
-        if (cursor != null && cursor.moveToFirst()) {
+        if (cursor!= null && cursor.moveToFirst()) {
             try {
                 String name = cursor.getString(0);
+                // 将查询到的联系人姓名存入缓存
                 sContactCache.put(phoneNumber, name);
                 return name;
             } catch (IndexOutOfBoundsException e) {
+                // 如果在获取游标数据时出现越界等异常，记录错误日志
                 Log.e(TAG, " Cursor get string error " + e.toString());
                 return null;
             } finally {
+                // 无论是否出现异常，都要关闭游标，释放资源
                 cursor.close();
             }
         } else {
+            // 如果没有查询到对应的联系人，记录一条调试日志
             Log.d(TAG, "No contact matched with number:" + phoneNumber);
             return null;
         }
     }
-}
+}
\ No newline at end of file