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Li 1 year ago
parent 8463252205
commit 28ad3b3a60
5 changed files with 72 additions and 391 deletions
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171
Notes-master/src/net/micode/notes/data/NotesProvider.java
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@ -14,9 +14,10 @@
* limitations under the License.
*/
// 包声明，用于组织和访问控制。
package net.micode.notes.data;
// 导入各种Android框架和项目特定类的语句。
import android.app.SearchManager;
import android.content.ContentProvider;
import android.content.ContentUris;
@ -34,24 +35,25 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.NotesDatabaseHelper.TABLE;
// NotesProvider类的定义，它扩展了ContentProvider。
public class NotesProvider extends ContentProvider {
private static final UriMatcher mMatcher;
private static final UriMatcher mMatcher; // UriMatcher实例，用于匹配URI到相应的整型代码。
private NotesDatabaseHelper mHelper;
private NotesDatabaseHelper mHelper; // 数据库帮助类实例，用于访问SQLite数据库。
private static final String TAG = "NotesProvider";
private static final String TAG = "NotesProvider"; // 用于日志记录的标签。
private static final int URI_NOTE = 1;
private static final int URI_NOTE_ITEM = 2;
private static final int URI_DATA = 3;
private static final int URI_DATA_ITEM = 4;
private static final int URI_SEARCH = 5;
private static final int URI_SEARCH_SUGGEST = 6;
// 定义与URI匹配的整型代码。
private static final int URI_NOTE = 1;
private static final int URI_NOTE_ITEM = 2;
private static final int URI_DATA = 3;
private static final int URI_DATA_ITEM = 4;
private static final int URI_SEARCH = 5;
private static final int URI_SEARCH_SUGGEST = 6;
static {
mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
// 初始化UriMatcher，将URI路径映射到整型代码。
mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
@ -61,143 +63,101 @@ public class NotesProvider extends ContentProvider {
mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
}
/**
* x'0A' represents the '\n' character in sqlite. For title and content in the search result,
* we will trim '\n' and white space in order to show more information.
*/
private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+ " FROM " + TABLE.NOTE
+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
// onCreate()方法在ContentProvider创建时调用，用于初始化。
@Override
public boolean onCreate() {
mHelper = NotesDatabaseHelper.getInstance(getContext());
return true;
return true; // 返回true表示初始化成功。
}
// query()方法用于处理URI查询请求。
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
Cursor c = null;
SQLiteDatabase db = mHelper.getReadableDatabase();
String id = null;
String sortOrder) {
Cursor c = null; // 初始化游标。
SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库实例。
String id = null; // 用于存储从URI中解析出的ID。
// 根据UriMatcher匹配的结果，执行相应的查询操作。
switch (mMatcher.match(uri)) {
case URI_NOTE:
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
sortOrder);
// 查询笔记表。
c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
break;
case URI_NOTE_ITEM:
// 根据ID查询单个笔记。
id = uri.getPathSegments().get(1);
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_DATA:
c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
sortOrder);
break;
case URI_DATA_ITEM:
id = uri.getPathSegments().get(1);
c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
case URI_SEARCH:
case URI_SEARCH_SUGGEST:
if (sortOrder != null || projection != null) {
throw new IllegalArgumentException(
"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
}
String searchString = null;
if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
if (uri.getPathSegments().size() > 1) {
searchString = uri.getPathSegments().get(1);
}
} else {
searchString = uri.getQueryParameter("pattern");
}
if (TextUtils.isEmpty(searchString)) {
return null;
}
try {
searchString = String.format("%%%s%%", searchString);
c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
new String[] { searchString });
} catch (IllegalStateException ex) {
Log.e(TAG, "got exception: " + ex.toString());
}
c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder);
break;
// 其他case处理不同的URI类型...
default:
throw new IllegalArgumentException("Unknown URI " + uri);
throw new IllegalArgumentException("未知URI " + uri);
}
if (c != null) {
// 设置通知URI，当数据改变时可以通知外部。
c.setNotificationUri(getContext().getContentResolver(), uri);
}
return c;
return c; // 返回查询结果游标。
}
@Override
public Uri insert(Uri uri, ContentValues values) {
// 获取数据库写入权限
SQLiteDatabase db = mHelper.getWritableDatabase();
long dataId = 0, noteId = 0, insertedId = 0;
// 根据传入的URI判断是插入note还是data
switch (mMatcher.match(uri)) {
case URI_NOTE:
// 插入note并获取插入行的ID
insertedId = noteId = db.insert(TABLE.NOTE, null, values);
break;
case URI_DATA:
// 插入data之前需要检查是否包含note的ID
if (values.containsKey(DataColumns.NOTE_ID)) {
noteId = values.getAsLong(DataColumns.NOTE_ID);
} else {
Log.d(TAG, "Wrong data format without note id:" + values.toString());
}
// 插入data并获取插入行的ID
insertedId = dataId = db.insert(TABLE.DATA, null, values);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// Notify the note uri
// 如果noteId有效，则通知note的URI数据已更改
if (noteId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
}
// Notify the data uri
// 如果dataId有效，则通知data的URI数据已更改
if (dataId > 0) {
getContext().getContentResolver().notifyChange(
ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
}
// 返回插入数据的URI
return ContentUris.withAppendedId(uri, insertedId);
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
// 初始化删除计数和ID
int count = 0;
String id = null;
// 获取数据库写入权限
SQLiteDatabase db = mHelper.getWritableDatabase();
boolean deleteData = false;
// 根据传入的URI判断是删除note还是data
switch (mMatcher.match(uri)) {
case URI_NOTE:
// 构建删除note的条件
selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
count = db.delete(TABLE.NOTE, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
// 获取note的ID
id = uri.getPathSegments().get(1);
/**
* ID that smaller than 0 is system folder which is not allowed to
* trash
*/
// 删除指定ID的note，注意ID必须大于0
long noteId = Long.valueOf(id);
if (noteId <= 0) {
break;
@ -206,10 +166,12 @@ public class NotesProvider extends ContentProvider {
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
break;
case URI_DATA:
// 删除data表中满足条件的记录
count = db.delete(TABLE.DATA, selection, selectionArgs);
deleteData = true;
break;
case URI_DATA_ITEM:
// 获取data的ID并删除指定ID的记录
id = uri.getPathSegments().get(1);
count = db.delete(TABLE.DATA,
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
@ -218,37 +180,46 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 如果有记录被删除，则通知相应的URI数据已更改
if (count > 0) {
if (deleteData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
}
// 返回被删除的记录数
return count;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
// 初始化更新计数和ID
int count = 0;
String id = null;
// 获取数据库写入权限
SQLiteDatabase db = mHelper.getWritableDatabase();
boolean updateData = false;
// 根据传入的URI判断是更新note还是data
switch (mMatcher.match(uri)) {
case URI_NOTE:
// 更新note表中满足条件的记录
increaseNoteVersion(-1, selection, selectionArgs);
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
break;
case URI_NOTE_ITEM:
// 获取note的ID并更新指定ID的记录
id = uri.getPathSegments().get(1);
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);
break;
case URI_DATA:
// 更新data表中满足条件的记录
count = db.update(TABLE.DATA, values, selection, selectionArgs);
updateData = true;
break;
case URI_DATA_ITEM:
// 获取data的ID并更新指定ID的记录
id = uri.getPathSegments().get(1);
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+ parseSelection(selection), selectionArgs);
@ -257,49 +228,51 @@ public class NotesProvider extends ContentProvider {
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// 如果有记录被更新，则通知相应的URI数据已更改
if (count > 0) {
if (updateData) {
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
}
getContext().getContentResolver().notifyChange(uri, null);
}
// 返回被更新的记录数
return count;
}
private String parseSelection(String selection) {
// 构建额外的条件
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
}
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
StringBuilder sql = new StringBuilder(120);
sql.append("UPDATE ");
sql.append(TABLE.NOTE);
sql.append(" SET ");
sql.append(NoteColumns.VERSION);
sql.append("=" + NoteColumns.VERSION + "+1 ");
sql.append("UPDATE "); // 更新语句
sql.append(TABLE.NOTE); // 表名
sql.append(" SET "); // 设置要更新的字段
sql.append(NoteColumns.VERSION); // 版本字段
sql.append("=" + NoteColumns.VERSION + "+1 "); // 版本号加1
if (id > 0 || !TextUtils.isEmpty(selection)) {
sql.append(" WHERE ");
sql.append(" WHERE "); // 添加WHERE子句，用于指定更新的条件
}
if (id > 0) {
sql.append(NoteColumns.ID + "=" + String.valueOf(id));
sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 拼接ID条件
}
if (!TextUtils.isEmpty(selection)) {
String selectString = id > 0 ? parseSelection(selection) : selection;
for (String args : selectionArgs) {
String selectString = id > 0 ? parseSelection(selection) : selection; // 解析选择条件
for (String args : selectionArgs) { // 替换选择参数
selectString = selectString.replaceFirst("\\?", args);
}
sql.append(selectString);
sql.append(selectString); // 拼接选择条件
}
mHelper.getWritableDatabase().execSQL(sql.toString());
mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL语句
}
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
return null;
return null; // 返回类型暂未实现
}
}

290
Notes.java
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@ -1,290 +0,0 @@
/*
* 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;//包声明
import android.net.Uri;//导入Android框架中的Uri类
public class Notes
{
public static final String AUTHORITY = "micode_notes";
public static final String TAG = "Notes";
public static final int TYPE_NOTE = 0;
public static final int TYPE_FOLDER = 1;
public static final int TYPE_SYSTEM = 2;//定义了公共静态常量，用于提供一些固定的值
/**
* Following IDs are system folders' identifiers
* {@link Notes#ID_ROOT_FOLDER } is default folder
* {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
* {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
*/
public static final int ID_ROOT_FOLDER = 0;
public static final int ID_TEMPARAY_FOLDER = -1;
public static final int ID_CALL_RECORD_FOLDER = -2;
public static final int ID_TRASH_FOLER = -3;//定义了四个public static final整型常量
public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";//同样定义了四个public static final字符串常量
//用于在Android开发中标识Intent的额外数据
public static final int TYPE_WIDGET_INVALIDE = -1;
public static final int TYPE_WIDGET_2X = 0;
public static final int TYPE_WIDGET_4X = 1;//定义了三个public static final整数常量，它们很可能用于标识不同类型的小部件或视图
public static class DataConstants {
public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
}//定义了一个DataConstants的静态类，该类包含两个静态的、不可变的（final）字符串常量
/**
* Uri to query all notes and folders
*/
public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
//定义了一个公共的、静态的、不可变的（final）Uri对象，名为CONTENT_NOTE_URI。这个Uri对象表示一个特定的内容URI，用于Android的内容提供者来标识和访问数据
/**
* Uri to query data
*/
public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
public interface NoteColumns //NoteColumns这样的接口通常用于定义数据库表的列名常量
{
/**
* The unique ID for a row
* <P> Type: INTEGER (long) </P>
*/
public static final String ID = "_id";//NoteColumns接口定义了一个公共的静态最终（public static final）字符串常量ID，其值为"_id"
/**
* The parent's id for note or folder
* <P> Type: INTEGER (long) </P>
*/
public static final String PARENT_ID = "parent_id";//NoteColumns接口定义了一个公共的静态最终（public static final）字符串常量PARENT_ID，其值为"parent_id"
/**
* Created data for note or folder
* <P> Type: INTEGER (long) </P>
*/
public static final String CREATED_DATE = "created_date";//NoteColumns接口定义了一个公共的静态最终（public static final）字符串常量CREATED_DATE，其值为"created_date"
/**
* Latest modified date
* <P> Type: INTEGER (long) </P>
*/
public static final String MODIFIED_DATE = "modified_date";//定义一个字符串常量，命名为modified_date
/**
* Alert date
* <P> Type: INTEGER (long) </P>
*/
public static final String ALERTED_DATE = "alert_date";//定义一个字符串常量，命名为alert_date
/**
* Folder's name or text content of note
* <P> Type: TEXT </P>
*/
public static final String SNIPPET = "snippet";//定义一个字符串常量，命名为snippet
/**
* Note's widget id
* <P> Type: INTEGER (long) </P>
*/
public static final String WIDGET_ID = "widget_id";//定义一个字符串常量，命名为widget_id
/**
* Note's widget type
* <P> Type: INTEGER (long) </P>
*/
public static final String WIDGET_TYPE = "widget_type";//定义一个字符串常量，命名为widget_type
/**
* Note's background color's id
* <P> Type: INTEGER (long) </P>
*/
public static final String BG_COLOR_ID = "bg_color_id";//定义一个字符串常量，命名为bg_color_id
/**
* For text note, it doesn't has attachment, for multi-media
* note, it has at least one attachment
* <P> Type: INTEGER </P>
*/
public static final String HAS_ATTACHMENT = "has_attachment";//定义一个字符串常量，命名为has_attachment
/**
* Folder's count of notes
* <P> Type: INTEGER (long) </P>
*/
public static final String NOTES_COUNT = "notes_count";//定义一个字符串常量，命名为notes_count
/**
* The file type: folder or note
* <P> Type: INTEGER </P>
*/
public static final String TYPE = "type";//定义一个字符串常量，命名为type
/**
* The last sync id
* <P> Type: INTEGER (long) </P>
*/
public static final String SYNC_ID = "sync_id";//定义一个字符串常量，命名为sync_id
/**
* Sign to indicate local modified or not
* <P> Type: INTEGER </P>
*/
public static final String LOCAL_MODIFIED = "local_modified";//定义一个字符串常量，命名为local_modified
/**
* Original parent id before moving into temporary folder
* <P> Type : INTEGER </P>
*/
public static final String ORIGIN_PARENT_ID = "origin_parent_id";//定义一个字符串常量，命名为origin_parent_id
/**
* The gtask id
* <P> Type : TEXT </P>
*/
public static final String GTASK_ID = "gtask_id";//定义一个字符串常量，命名为gtask_id
/**
* The version code
* <P> Type : INTEGER (long) </P>
*/
public static final String VERSION = "version";//定义一个字符串常量，命名为version
}
//其实质上就是对之前出现过的变量与常量进行初始化与处理，
public interface DataColumns //同样是一个定义数据库列名常量的地方
{
/**
* The unique ID for a row
* <P> Type: INTEGER (long) </P>
*/
public static final String ID = "_id";//定义了一个名为 ID 的常量，其值为字符串 _id
/**
* The MIME type of the item represented by this row.
* <P> Type: Text </P>
*/
public static final String MIME_TYPE = "mime_type";//定义了一个名为MIME_TYPE的常量，其值为字符串 mime_type
/**
* The reference id to note that this data belongs to
* <P> Type: INTEGER (long) </P>
*/
public static final String NOTE_ID = "note_id";//对其NOTE_ID进行定义与初始化
/**
* Created data for note or folder
* <P> Type: INTEGER (long) </P>
*/
public static final String CREATED_DATE = "created_date";//对其CREATED_DATE进行定义与初始化
/**
* Latest modified date
* <P> Type: INTEGER (long) </P>
*/
public static final String MODIFIED_DATE = "modified_date";//对其MODIFIED_DATE进行定义与初始化
/**
* Data's content
* <P> Type: TEXT </P>
*/
public static final String CONTENT = "content";//对其CONTENT进行定义与初始化
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* integer data type
* <P> Type: INTEGER </P>
*/
public static final String DATA1 = "data1";//对其DATA1进行定义与初始化
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* integer data type
* <P> Type: INTEGER </P>
*/
public static final String DATA2 = "data2";//对其DATA2 进行定义与初始化
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA3 = "data3";//对其DATA3进行定义与初始化
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA4 = "data4";//对其 DATA4 进行定义与初始化
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA5 = "data5";//对其DATA5进行定义与初始化
}
public static final class TextNote implements DataColumns //TextNote 是一个公共的静态最终类（public static final class），它实现了 DataColumns 接口。
//这意味着 TextNote 类将继承 DataColumns 接口中定义的所有公共和受保护的常量和方法
{
/**
* Mode to indicate the text in check list mode or not
* <P> Type: Integer 1:check list mode 0: normal mode </P>
*/
public static final String MODE = DATA1;//定义了一个名为 MODE 的公共静态最终字符串常量
public static final int MODE_CHECK_LIST = 1;//定义了一个名为 MODE_CHECK_LIST 的公共静态最终整数常量，并赋值为 1
public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";//这行代码定义了一个名为 CONTENT_TYPE 的公共静态最终字符串常量，用来表示文本笔记内容类型的MIME类型
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";//这行代码定义了一个名为 CONTENT_ITEM_TYPE 的公共静态最终字符串常量，
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");//定义了一个公共的、静态的、最终的 Uri 对象
}
public static final class CallNote implements DataColumns //定义了一个名为CallNote的静态内部类，并且这个类实现了DataColumns接口
{
/**
* Call date for this record
* <P> Type: INTEGER (long) </P>
*/
public static final String CALL_DATE = DATA1;//CALL_DATE是一个公共的、静态的、最终的字符串常量，它的值被设置为DATA1
/**
* Phone number for this record
* <P> Type: TEXT </P>
*/
public static final String PHONE_NUMBER = DATA3;//同样地，PHONE_NUMBER是一个公共的、静态的、最终的字符串常量，它的值被设置为DATA3
public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";//CONTENT_TYPE是一个表示MIME类型的常量，用于描述CallNote类型的数据集是一个目录（dir）
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";//CONTENT_ITEM_TYPE是一个表示MIME类型的常量，用于描述CallNote类型的数据项是一个单个项目
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");//定义了一个公共的、静态的、最终的Uri对象，名为CONTENT_URI。
}
}

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# ReadCodeAndAnalyse

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