
回复
该应用程序是一个待办事项管理工具,主要功能包括:
Room 是一种持久化库,它在 SQLite 上提供了一个抽象层,我们可以方便地进行数据库操作。
NotificationManager 是 Android 框架的一部分,用于在指定时间发送通知提醒用户某个事件或任务。
使用 Room 数据库存储待办事项,每个待办事项包含以下字段:
利用 AlarmManager 设置提醒时间,在指定时间触发广播接收器,进而通过 NotificationManager 发送通知。
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]
@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();
}
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);
}
}
@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.
}
通过本项目,我们实现了一个功能全面的待办事项管理应用。其核心技术包括 Room 数据库和 NotificationManager 提醒功能,实现了待办事项的创建、编辑、删除以及按日期、优先级排序和提醒功能。在实际应用中,可以大大提高用户工作和生活的便利性和效率。
通过不断的优化和升级,我们相信鸿蒙生态下的待办事项管理应用将会有更广泛的应用前景。