diff --git a/app/build/intermediates/dex/debug/mergeDexDebug/classes.dex b/app/build/intermediates/dex/debug/mergeDexDebug/classes.dex
index 27757cb..7e1ecf3 100644
Binary files a/app/build/intermediates/dex/debug/mergeDexDebug/classes.dex and b/app/build/intermediates/dex/debug/mergeDexDebug/classes.dex differ
diff --git a/app/build/intermediates/incremental/packageDebug/tmp/debug/dex-renamer-state.txt b/app/build/intermediates/incremental/packageDebug/tmp/debug/dex-renamer-state.txt
index 7afb3f1..e1e5665 100644
--- a/app/build/intermediates/incremental/packageDebug/tmp/debug/dex-renamer-state.txt
+++ b/app/build/intermediates/incremental/packageDebug/tmp/debug/dex-renamer-state.txt
@@ -1,4 +1,4 @@
-#Fri Mar 31 15:48:56 CST 2023
-base.0=E\:\\AdvancedMiNotes\\app\\build\\intermediates\\dex\\debug\\mergeDexDebug\\classes.dex
+#Fri Mar 31 16:49:37 CST 2023
+base.0=D\:\\Android_projects\\app\\build\\intermediates\\dex\\debug\\mergeDexDebug\\classes.dex
 renamed.0=classes.dex
 path.0=classes.dex
diff --git a/app/build/intermediates/javac/debug/classes/net/micode/notes/data/Contact.class b/app/build/intermediates/javac/debug/classes/net/micode/notes/data/Contact.class
index 393e865..4a446db 100644
Binary files a/app/build/intermediates/javac/debug/classes/net/micode/notes/data/Contact.class and b/app/build/intermediates/javac/debug/classes/net/micode/notes/data/Contact.class differ
diff --git a/app/build/intermediates/project_dex_archive/debug/out/net/micode/notes/data/Contact.dex b/app/build/intermediates/project_dex_archive/debug/out/net/micode/notes/data/Contact.dex
index 1f9ff81..4a523e4 100644
Binary files a/app/build/intermediates/project_dex_archive/debug/out/net/micode/notes/data/Contact.dex and b/app/build/intermediates/project_dex_archive/debug/out/net/micode/notes/data/Contact.dex differ
diff --git a/app/build/tmp/compileDebugJavaWithJavac/previous-compilation-data.bin b/app/build/tmp/compileDebugJavaWithJavac/previous-compilation-data.bin
index cf78007..9e3f619 100644
Binary files a/app/build/tmp/compileDebugJavaWithJavac/previous-compilation-data.bin and b/app/build/tmp/compileDebugJavaWithJavac/previous-compilation-data.bin differ
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 5bd6ac3..b132d43 100644
--- a/app/src/main/java/net/micode/notes/data/Contact.java
+++ b/app/src/main/java/net/micode/notes/data/Contact.java
@@ -36,20 +36,23 @@ public class Contact {
             + " FROM phone_lookup"
             + " WHERE min_match = '+')";
 
-/*判断是否存在映射关系
-* 若不存在，创建并存储在哈希表中
-* 存在，则返回Phonenumber*/
+
+    /**
+     * 判断是否存在映射关系
+     * 若不存在，创建并存储在哈希表中
+     */
     public static String getContact(Context context, String phoneNumber) {
         if (sContactCache == null) {
             sContactCache = new HashMap<String, String>();
         }
-
+        // 查找HashMap中是否已有phoneNumber信息，如果存在则返回phoneNumber信息
         if (sContactCache.containsKey(phoneNumber)) {
             return sContactCache.get(phoneNumber);
         }
-/*
-“+”号
-*/
+
+        /**
+         * 查找数据库中phoneNumber的信息
+         */
         String selection = CALLER_ID_SELECTION.replace("+",
                 PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
         Cursor cursor = context.getContentResolver().query(
@@ -59,12 +62,22 @@ public class Contact {
                 new String[]{phoneNumber},
                 null);
 
+        /**
+         * 判定查询结果，若不为空，moveToFirst()返回第一条；否则返回空
+         */
         if (cursor != null && cursor.moveToFirst()) {
+            /**
+             * 找到相关情况时
+             */
             try {
                 String name = cursor.getString(0);
                 sContactCache.put(phoneNumber, name);
                 return name;
-            } catch (IndexOutOfBoundsException e) {
+            }
+            /**
+             * 异常
+             */
+            catch (IndexOutOfBoundsException e) {
                 Log.e(TAG, " Cursor get string error " + e.toString());
                 return null;
             } finally {