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Note.java代码注释

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Notes.java
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/*
* 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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