ADD file via upload

Contact.java

@@ -0,0 +1,91 @@
+/*
+ * 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.
+ */
+
+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 {
+    ////用于缓存联系人姓名和对应的电话号码
+    private static HashMap<String, String> sContactCache;
+    private static final String TAG = "Contact";
+    //查询电话号码和联系人关联的数据表和列
+    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 = '+')";
+
+    /**
+     * 获取给定电话号码对应的联系人姓名
+     *
+     * @param context 上下文，用于访问数据
+     * @param phoneNumber 需要查询的电话号码
+     * @return 给定电话号码对应的联系人姓名，若查询失败则返回null
+     */
+    public static String getContact(Context context, String phoneNumber) {
+        //如果联系人信息的缓存未创建，则先创建缓存
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+    //如果该电话号码的联系人姓名已经在缓存中，直接返回联系人姓名
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+        //构建查询表达式，查找号码对应的联系人
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+    //查询数据
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,
+                new String [] { Phone.DISPLAY_NAME },//需要查询的列，即联系人姓名
+                selection,//查询表达式
+                new String[] { phoneNumber },//查询表达式中需要的参数，即要查询的电话号码
+                null);//不需要排序
+        
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+
+                String name = cursor.getString(0);//获取查询结果的第一列，即联系人姓名
+                sContactCache.put(phoneNumber, name);//将查询结果缓存起来，便于下次查询时直接使用缓存
+                return name;
+
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;//若查询结果的第一列不是联系人姓名，返回null
+            } finally {
+                cursor.close();//关闭数据查询游标
+            }
+
+        } else {
+            //如果没有查询到联系人信息，记录日志并返回null值
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+    }
+}