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Code-Reading-MiNote/zhushi1.txt

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package net.micode.notes.data;
import android.net.Uri;
public class Notes {
// 用于表示笔记应用中的各种类型、标识符以及Intent的额外数据
public static final String AUTHORITY = "micode_notes";
public static final String TAG = "Notes";
//对NoteColumns.TYPE的值进行设置时使用
//即不同种类:笔记、文件夹和系统文件夹
public static final int TYPE_NOTE = 0;
public static final int TYPE_FOLDER = 1;
public static final int TYPE_SYSTEM = 2;
/**
* 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
*/
//以下id是系统文件夹的标识符即系统文件夹的分类
//ID_ROOT_FOLDER默认文件夹
//ID_TEMPARAY_FOLDER不属于文件夹的笔记
//ID_CALL_RECORD_FOLDER用于存储通话记录以便返回
//ID_TRASH_FOLER垃圾回收站
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;
// 额外的数据键个人理解为就是定义一些布局的ID
// 这部分就是用于设置UI界面的一些布局或小组件的id给它定义成常量了。
// 这样的封装性可能比较好因为如果有部分要修改则直接来这边修改即可不用在activity部分一个一个修改。
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";
public static final int TYPE_WIDGET_INVALIDE = -1;
public static final int TYPE_WIDGET_2X = 0;
public static final int TYPE_WIDGET_4X = 1;
// 数据常量:里面定义了两种类型:文本便签和通话记录
public static class DataConstants {
public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
}
//下面这些有类似指针的效果? 其实就是定义一堆访问笔记和文件的uri
//GPTAndroid开发中常见的用于定义内容提供者Content ProviderURI
//内容提供者是一种Android组件它允许应用程序共享和存储数据。这里定义了一个URI来查询数据
/**
* Uri to query all notes and folders
*/
public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
/**
* Uri to query data
*/
public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
public interface NoteColumns {
// 雨:这个接口定义了一系列静态的、最终的字符串常量,这些常量代表数据库表中的列名。
// 作用:用于后面创建数据库的表头
// 总的属性有ID、父级ID、创建日期、修改日期、提醒日期、文件标签摘要、小部件ID、小部件类型、背景颜色ID、附件、文件中的标签数量、
// 文件标签类型、最后一个同步ID、本地修改标签、移动前的ID、谷歌任务ID、代码版本信息。
// GPT提示在Android开发中当使用SQLite数据库时通常会为表中的每一列定义一个常量以便在代码中引用。
// 这样做的好处是,如果以后需要更改列名,只需要在一个地方修改,而不需要在整个代码中搜索和替换。
/**
* The unique ID for a row
* <P> Type: INTEGER (long) </P>
*/
public static final String ID = "_id";
/**
* The parent's id for note or folder
* <P> Type: INTEGER (long) </P>
*/
public static final String PARENT_ID = "parent_id";
/**
* Created data for note or folder
* <P> Type: INTEGER (long) </P>
*/
public static final String CREATED_DATE = "created_date";
/**
* Latest modified date
* <P> Type: INTEGER (long) </P>
*/
public static final String MODIFIED_DATE = "modified_date";
/**
* Alert date
* <P> Type: INTEGER (long) </P>
*/
public static final String ALERTED_DATE = "alert_date";
/**
* Folder's name or text content of note
* <P> Type: TEXT </P>
*/
// 摘要?
public static final String SNIPPET = "snippet";
/**
* Note's widget id
* <P> Type: INTEGER (long) </P>
*/
public static final String WIDGET_ID = "widget_id";
/**
* Note's widget type
* <P> Type: INTEGER (long) </P>
*/
public static final String WIDGET_TYPE = "widget_type";
/**
* Note's background color's id
* <P> Type: INTEGER (long) </P>
*/
public static final String BG_COLOR_ID = "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";
/**
* Folder's count of notes
* <P> Type: INTEGER (long) </P>
*/
public static final String NOTES_COUNT = "notes_count";
/**
* The file type: folder or note
* <P> Type: INTEGER </P>
*/
public static final String TYPE = "type";
/**
* The last sync id
* <P> Type: INTEGER (long) </P>
*/
//雨在数据同步过程中这个ID可能用来跟踪和识别每次同步操作的唯一性确保数据的一致性。
public static final String SYNC_ID = "sync_id";
/**
* Sign to indicate local modified or not
* <P> Type: INTEGER </P>
*/
public static final String LOCAL_MODIFIED = "local_modified";
/**
* Original parent id before moving into temporary folder
* <P> Type : INTEGER </P>
*/
public static final String ORIGIN_PARENT_ID = "origin_parent_id";
/**
* The gtask id
* <P> Type : TEXT </P>
*/
public static final String GTASK_ID = "gtask_id";
/**
* The version code
* <P> Type : INTEGER (long) </P>
*/
public static final String VERSION = "version";
}
public interface DataColumns {
// DataColumns的接口这个接口包含了一系列静态常量这些常量代表了数据库表中用于存储数据的列名。
// 每个常量都有相应的注释,说明该列的作用和数据类型。
/**
* The unique ID for a row
* <P> Type: INTEGER (long) </P>
*/
public static final String ID = "_id";
/**
* The MIME type of the item represented by this row.
* <P> Type: Text </P>
*/
//MIME类型是一种标准用于标识文档、文件或字节流的性质和格式。在数据库中这个字段可以用来识别不同类型的数据例如文本、图片、音频或视频等。
public static final String MIME_TYPE = "mime_type";
/**
* The reference id to note that this data belongs to
* <P> Type: INTEGER (long) </P>
*/
//归属的Note的ID
public static final String NOTE_ID = "note_id";
/**
* Created data for note or folder
* <P> Type: INTEGER (long) </P>
*/
//创建日期
public static final String CREATED_DATE = "created_date";
/**
* Latest modified date
* <P> Type: INTEGER (long) </P>
*/
//最近修改日期
public static final String MODIFIED_DATE = "modified_date";
/**
* Data's content
* <P> Type: TEXT </P>
*/
//数据内容
public static final String CONTENT = "content";
// 以下5个是通用数据列它们的具体意义取决于MIME类型由MIME_TYPE字段指定
// 不同的MIME类型可能需要存储不同类型的数据这五个字段提供了灵活性允许根据MIME类型来存储相应的数据。
// 读后面的代码感觉这部分是在表示内容的不同状态?
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* integer data type
* <P> Type: INTEGER </P>
*/
public static final String DATA1 = "data1";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* integer data type
* <P> Type: INTEGER </P>
*/
public static final String DATA2 = "data2";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA3 = "data3";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA4 = "data4";
/**
* Generic data column, the meaning is {@link #MIMETYPE} specific, used for
* TEXT data type
* <P> Type: TEXT </P>
*/
public static final String DATA5 = "data5";
}
//以下是文本便签的定义
public static final class TextNote implements DataColumns {
/**
* 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; //模式这个被存在DATA1列中
public static final int MODE_CHECK_LIST = 1; //所处检查列表模式?
public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note"; // 定义了MIME类型用于标识文本标签的目录
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";// 定义了MIME类型用于标识文本标签的单个项
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");//文本标签内容提供者Content Provider的URI用于访问文本标签数据
}
// 通话记录的定义?
public static final class CallNote implements DataColumns {
/**
* Call date for this record
* <P> Type: INTEGER (long) </P>
*/
public static final String CALL_DATE = DATA1; //一个字符串常量,表示通话记录的日期
/**
* Phone number for this record
* <P> Type: TEXT </P>
*/
public static final String PHONE_NUMBER = DATA3; //意味着在数据库表中这个电话号码信息将被存储在DATA3列中
public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";// 同样定义了MIME类型是用于标识通话记录的目录。
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";// 同样定义了MIME类型是用于标识通话记录的单个项。
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");//定义了通话记录内容提供者的URI用于访问通话记录数据。
}
}