graph LR
A[用户操作] --> B[创建/编辑/删除待办事项]
B --> C[Room 数据库操作]
C --> D[更新数据列表]
D --> E[设置/取消提醒]
E --> F[AlarmManager 触发]
F --> G[BroadcastReceiver 接收]
G --> H[NotificationManager 发送通知]
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@Entity(tableName = "tasks")
public class Task {
    @PrimaryKey(autoGenerate = true)
    private int id;
    private String title;
    private String description;
    private long date;
    private int priority;

    // Getters and Setters...
}

@Dao
public interface TaskDao {
    @Insert
    void insert(Task task);

    @Update
    void update(Task task);

    @Delete
    void delete(Task task);

    @Query("SELECT * FROM tasks ORDER BY date ASC")
    LiveData<List<Task>> getAllTasks();
}

@Database(entities = {Task.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
    public abstract TaskDao taskDao();
}
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public class ReminderBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "reminderChannel")
                .setSmallIcon(R.drawable.ic_notification)
                .setContentTitle(intent.getStringExtra("title"))
                .setContentText(intent.getStringExtra("description"))
                .setPriority(NotificationCompat.PRIORITY_HIGH);

        notificationManager.notify((int) System.currentTimeMillis(), builder.build());
    }
}

public class ReminderHelper {
    public static void setReminder(Context context, Task task) {
        Intent intent = new Intent(context, ReminderBroadcastReceiver.class);
        intent.putExtra("title", task.getTitle());
        intent.putExtra("description", task.getDescription());

        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, task.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.setExact(AlarmManager.RTC_WAKEUP, task.getDate(), pendingIntent);
    }

    public static void cancelReminder(Context context, int taskId) {
        Intent intent = new Intent(context, ReminderBroadcastReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, taskId, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.cancel(pendingIntent);
    }
}
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@Test
public void testDatabaseInsertAndRetrieve() {
    Task task = new Task("Test Title", "Test Description", System.currentTimeMillis(), 1);
    appDatabase.taskDao().insert(task);
    List<Task> tasks = appDatabase.taskDao().getAllTasks().getValue();

    assertNotNull(tasks);
    assertFalse(tasks.isEmpty());
    assertEquals("Test Title", tasks.get(0).getTitle());
}

@Test
public void testReminderSetAndCancel() {
    Task task = new Task("Test Title", "Test Description", System.currentTimeMillis() + 10000, 1);
    ReminderHelper.setReminder(context, task);
    // Check if the reminder is set by verifying pending intents.
    ReminderHelper.cancelReminder(context, task.getId());
    // Further assertions to verify that the reminder has been canceled.
}
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