陈念焯注释

src/net/micode/notes/data/Notes.java

@@ -14,12 +14,14 @@
  * limitations under the License.
  */
 
-package net.micode.notes.data;
+ 
+//这是一个Android应用中用于管理笔记数据的常量定义类，属于net.micode.notes.data包。
+package net.micode.notes.data;//导入包
 
-import android.net.Uri;
-public class Notes {
+import android.net.Uri;//导入了Android的Uri类用于处理内容URI
+public class Notes {//定义了三种类型常量：普通笔记、文件夹和系统文件夹
     public static final String AUTHORITY = "micode_notes";
-    public static final String TAG = "Notes";
+    public static final String TAG = "Notes";//TAG: 用于日志的标签
     public static final int TYPE_NOTE     = 0;
     public static final int TYPE_FOLDER   = 1;
     public static final int TYPE_SYSTEM   = 2;
@@ -30,11 +32,12 @@ public class Notes {
      * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
      * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
      */
+    //定义了系统文件夹的特殊ID值，包括根文件夹、临时文件夹、通话记录文件夹和回收站
     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;
-
+    //定义了用于Activity或Service间传递数据的Intent Extra键名
     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";
@@ -42,25 +45,25 @@ public class Notes {
     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";
 
+    //定义了笔记小部件的类型常量
     public static final int TYPE_WIDGET_INVALIDE      = -1;
     public static final int TYPE_WIDGET_2X            = 0;
     public static final int TYPE_WIDGET_4X            = 1;
 
+    //定义了数据类型常量，包括普通笔记和通话笔记
     public static class DataConstants {
         public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
         public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
     }
 
+    //定义了访问笔记和数据的ContentProvider URI
     /**
      * 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");
 
+    //定义了笔记表的列名常量，包括ID、父ID、创建日期、修改日期等
     public interface NoteColumns {
         /**
          * The unique ID for a row
@@ -167,6 +170,7 @@ public class Notes {
         public static final String VERSION = "version";
     }
 
+    //定义了数据表的列名常量，包括ID、MIME类型、笔记ID等
     public interface DataColumns {
         /**
          * The unique ID for a row
@@ -241,6 +245,7 @@ public class Notes {
         public static final String DATA5 = "data5";
     }
 
+    //表示文本笔记的数据结构，定义了检查列表模式和内容类型
     public static final class TextNote implements DataColumns {
         /**
          * Mode to indicate the text in check list mode or not
@@ -257,6 +262,7 @@ public class Notes {
         public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
     }
 
+    //表示通话笔记的数据结构，定义了通话日期和电话号码字段
     public static final class CallNote implements DataColumns {
         /**
          * Call date for this record
@@ -276,4 +282,4 @@ public class Notes {
 
         public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
     }
-}
+}