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 //GPT:Android开发中常见的用于定义内容提供者(Content Provider)URI //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)名(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 *

Type: INTEGER (long)

*/ public static final String ID = "_id"; /** * The parent's id for note or folder *

Type: INTEGER (long)

*/ public static final String PARENT_ID = "parent_id"; /** * Created data for note or folder *

Type: INTEGER (long)

*/ public static final String CREATED_DATE = "created_date"; /** * Latest modified date *

Type: INTEGER (long)

*/ public static final String MODIFIED_DATE = "modified_date"; /** * Alert date *

Type: INTEGER (long)

*/ public static final String ALERTED_DATE = "alert_date"; /** * Folder's name or text content of note *

Type: TEXT

*/ // 摘要? public static final String SNIPPET = "snippet"; /** * Note's widget id *

Type: INTEGER (long)

*/ public static final String WIDGET_ID = "widget_id"; /** * Note's widget type *

Type: INTEGER (long)

*/ public static final String WIDGET_TYPE = "widget_type"; /** * Note's background color's id *

Type: INTEGER (long)

*/ 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 *

Type: INTEGER

*/ public static final String HAS_ATTACHMENT = "has_attachment"; /** * Folder's count of notes *

Type: INTEGER (long)

*/ public static final String NOTES_COUNT = "notes_count"; /** * The file type: folder or note *

Type: INTEGER

*/ public static final String TYPE = "type"; /** * The last sync id *

Type: INTEGER (long)

*/ //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 *

Type: INTEGER

*/ public static final String LOCAL_MODIFIED = "local_modified"; /** * Original parent id before moving into temporary folder *

Type : INTEGER

*/ public static final String ORIGIN_PARENT_ID = "origin_parent_id"; /** * The gtask id *

Type : TEXT

*/ public static final String GTASK_ID = "gtask_id"; /** * The version code *

Type : INTEGER (long)

*/ 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 *

Type: INTEGER (long)

*/ public static final String ID = "_id"; /** * The MIME type of the item represented by this row. *

Type: Text

*/ //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 *

Type: INTEGER (long)

*/ //归属的Note的ID public static final String NOTE_ID = "note_id"; /** * Created data for note or folder *

Type: INTEGER (long)

*/ //创建日期 public static final String CREATED_DATE = "created_date"; /** * Latest modified date *

Type: INTEGER (long)

*/ //最近修改日期 public static final String MODIFIED_DATE = "modified_date"; /** * Data's content *

Type: TEXT

*/ //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 *

Type: INTEGER

*/ public static final String DATA1 = "data1"; /** * Generic data column, the meaning is {@link #MIMETYPE} specific, used for * integer data type *

Type: INTEGER

*/ public static final String DATA2 = "data2"; /** * Generic data column, the meaning is {@link #MIMETYPE} specific, used for * TEXT data type *

Type: TEXT

*/ public static final String DATA3 = "data3"; /** * Generic data column, the meaning is {@link #MIMETYPE} specific, used for * TEXT data type *

Type: TEXT

*/ public static final String DATA4 = "data4"; /** * Generic data column, the meaning is {@link #MIMETYPE} specific, used for * TEXT data type *

Type: TEXT

*/ 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 *

Type: Integer 1:check list mode 0: normal mode

*/ 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 *

Type: INTEGER (long)

*/ 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 *

Type: TEXT

*/ 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。 } }