2

AlarmInitReceiver.txt

@@ -0,0 +1,52 @@
+
+/**
+ * 闹钟初始化接收器，用于设置便签的闹钟提醒。
+ */
+public class AlarmInitReceiver extends BroadcastReceiver {
+
+    // 查询字段
+    private static final String [] PROJECTION = new String [] {
+        NoteColumns.ID,        // 便签ID
+        NoteColumns.ALERTED_DATE // 便签的提醒日期
+    };
+
+    // 查询字段对应的列索引
+    private static final int COLUMN_ID                = 0;
+    private static final int COLUMN_ALERTED_DATE      = 1;
+
+    /**
+     * 接收到广播时调用。
+     * @param context 上下文对象
+     * @param intent 广播时传递的Intent
+     */
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        // 获取当前日期
+        long currentDate = System.currentTimeMillis();
+        // 查询所有未提醒且类型为便签的便签项
+        Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                PROJECTION,
+                NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
+                new String[] { String.valueOf(currentDate) },
+                null);
+
+        if (c != null) {
+            if (c.moveToFirst()) {
+                // 遍历查询结果，为每个便签设置闹钟
+                do {
+                    long alertDate = c.getLong(COLUMN_ALERTED_DATE);
+                    Intent sender = new Intent(context, AlarmReceiver.class);
+                    // 设置闹钟接收器的数据，以便知道是哪个便签需要提醒
+                    sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
+                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);
+                    AlarmManager alermManager = (AlarmManager) context
+                            .getSystemService(Context.ALARM_SERVICE);
+                    // 设置闹钟，使用RTC_WAKEUP模式确保设备在提醒时间被唤醒
+                    alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
+                } while (c.moveToNext());
+            }
+            c.close();
+        }
+    }
+}
+