闹钟ui注释

src/Notes-master/src/net/micode/notes/ui/AlarmInitReceiver.java

@@ -27,39 +27,53 @@ import android.database.Cursor;
 import net.micode.notes.data.Notes;
 import net.micode.notes.data.Notes.NoteColumns;
 
-
+/**
+ * 闹钟初始化广播接收器
+ * 功能：在设备启动后重新设置所有未触发的便签提醒
+ */
 public class AlarmInitReceiver extends BroadcastReceiver {
 
+    // 查询数据库的列投影
     private static final String [] PROJECTION = new String [] {
-        NoteColumns.ID,
-        NoteColumns.ALERTED_DATE
+        NoteColumns.ID,           // 便签ID列
+        NoteColumns.ALERTED_DATE  // 提醒日期列
     };
 
-    private static final int COLUMN_ID                = 0;
-    private static final int COLUMN_ALERTED_DATE      = 1;
+    // 列索引常量
+    private static final int COLUMN_ID                = 0; // ID列索引
+    private static final int COLUMN_ALERTED_DATE      = 1; // 提醒日期列索引
 
     @Override
     public void onReceive(Context context, Intent intent) {
+        // 获取当前系统时间
         long currentDate = System.currentTimeMillis();
+        
+        // 查询所有未触发且类型为普通便签的提醒
         Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
                 PROJECTION,
                 NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
-                new String[] { String.valueOf(currentDate) },
+                new String[] { String.valueOf(currentDate) }, // 参数：当前时间
                 null);
 
         if (c != null) {
             if (c.moveToFirst()) {
                 do {
+                    // 获取提醒时间
                     long alertDate = c.getLong(COLUMN_ALERTED_DATE);
+                    // 创建闹钟触发时要发送的Intent
                     Intent sender = new Intent(context, AlarmReceiver.class);
+                    // 设置便签URI
                     sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
+                    // 创建PendingIntent
                     PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
+                    // 获取AlarmManager服务
                     AlarmManager alermManager = (AlarmManager) context
                             .getSystemService(Context.ALARM_SERVICE);
+                    // 设置闹钟
                     alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
                 } while (c.moveToNext());
             }
             c.close();
         }
     }
-}
+}