From 848714bdc239a637ed4e6972b8aed2a5436e82ea Mon Sep 17 00:00:00 2001
From: pe7tcwbso <2761467147@qq.com>
Date: Thu, 26 Oct 2023 20:06:32 +0800
Subject: [PATCH] ADD file via upload

---
 Contact.java | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Contact.java

diff --git a/Contact.java b/Contact.java
new file mode 100644
index 0000000..32d9948
--- /dev/null
+++ b/Contact.java
@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+/*这段代码是一个用于获取联系人信息的工具类。主要功能是根据电话号码查询对应的联系人名称。*/
+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;
+
+public class Contact {
+    private static HashMap<String, String> sContactCache;
+    /*sContactCache是一个哈希映射，缓存已经查询过的联系人*/
+    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 "
+            + "(SELECT raw_contact_id "
+            + " FROM phone_lookup"
+            + " WHERE min_match = '+')";
+
+    public static String getContact(Context context, String phoneNumber) {
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+        /*检查是否包含了需要查询的变量*/
+
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,
+                new String [] { Phone.DISPLAY_NAME },
+                selection,
+                new String[] { phoneNumber },
+                null);
+/*如果sContactCache中不包含该电话号码，则构建查询条件selection，将电话号码转换为最小匹配模式，并替换查询语句中的占位符。
+ */
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                String name = cursor.getString(0);
+                sContactCache.put(phoneNumber, name);
+                return name;
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;
+            } finally {
+                cursor.close();
+            }
+        } else {
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+        /*接下来通过内容解析器ContentResolver查询联系人数据表Data.CONTENT_URI，查询列为联系人名称Phone.DISPLAY_NAME。
+
+        查询条件为电话号码与查询语句中的电话号码相等，并且数据类型为电话号码类型。
+
+        如果查询结果不为空且移动到第一条记录，则从查询结果中获取联系人名称，并将电话号码和联系人名称存入sContactCache中。
+
+        最后关闭查询结果的游标并返回联系人名称。*/
+    }
+    /*该类中的方法getContact()接受一个上下文Context和一个电话号码phoneNumber作为参数，返回与该电话号码相关联的联系人名称。*/
+
+}