# Agent-Powered Scheduled Reminder Development

## When to Use

You can set your application to call the **ReminderRequest** class to create scheduled reminders for countdown timers, calendar events, and alarm clocks. When the created reminders are published, the timing and pop-up notification functions of your application will be taken over by the reminder agent in the background, even when your application is frozen or exits.


## Available APIs

**reminderAgent** encapsulates the methods for publishing and canceling reminders.

**Table 1** Major APIs in reminderAgent

| Name| Description|
| -------- | -------- |
| function publishReminder(reminderReq: ReminderRequest, callback: AsyncCallback&lt;number&gt;): void;<br>function publishReminder(reminderReq: ReminderRequest): Promise&lt;number&gt;; | Publishes a scheduled reminder.<br>The maximum number of valid notifications (excluding expired ones that will not pop up again) is 30 for one application and 2000 for the entire system. |
| function cancelReminder(reminderId: number, callback: AsyncCallback&lt;void&gt;): void;<br>function cancelReminder(reminderId: number): Promise&lt;void&gt;; | Cancels a specified reminder. (The value of **reminderId** is obtained from the return value of **publishReminder**.)|
| function getValidReminders(callback: AsyncCallback&lt;Array&lt;ReminderRequest&gt;&gt;): void;<br>function getValidReminders(): Promise&lt;Array&lt;ReminderRequest&gt;&gt;; | Obtains all valid reminders set by the current application.|
| function cancelAllReminders(callback: AsyncCallback&lt;void&gt;): void;<br>function cancelAllReminders(): Promise&lt;void&gt;; | Cancels all reminders set by the current application.|
| function addNotificationSlot(slot: NotificationSlot, callback: AsyncCallback&lt;void&gt;): void;<br>function addNotificationSlot(slot: NotificationSlot): Promise&lt;void&gt;; | Registers a **NotificationSlot** instance to be used by the reminder. |
| function removeNotificationSlot(slotType: notification.SlotType, callback: AsyncCallback&lt;void&gt;): void;<br>function removeNotificationSlot(slotType: notification.SlotType): Promise&lt;void&gt;; | Removes a **NotificationSlot** instance of a specified type. |

**ActionButtonType** enumerates types of buttons displayed in a reminder notification.

**Table 2** ActionButtonType enums

| Name| Description|
| -------- | -------- |
| ACTION_BUTTON_TYPE_CLOSE | Close button, which can stop the reminder alert tone, close the reminder notification, and cancel the reminder snoozing.|
| ACTION_BUTTON_TYPE_SNOOZE | Snooze button, which can snooze the reminder.|

**ReminderType** enumerates the reminder types.

**Table 3** ReminderType enums

| Name| Description|
| -------- | -------- |
| REMINDER_TYPE_TIMER | Countdown reminder.|
| REMINDER_TYPE_CALENDAR | Calendar reminder.|
| REMINDER_TYPE_ALARM | Alarm reminder.|

**ActionButton** defines a button displayed in the reminder notification.

**Table 4** ActionButton

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| title | string | Yes| Text on the button.|
| type | ActionButtonType | Yes| Button type.|

**WantAgent** sets the package and ability that are redirected to when the reminder notification is clicked.

**Table 5** WantAgent

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| pkgName | string | Yes| Name of the package redirected to when the reminder notification is clicked.|
| abilityName | string | Yes| Name of the ability redirected to when the reminder notification is clicked.|

**MaxScreenWantAgent** sets the name of the target package and ability to start automatically when the reminder arrives and the device is not in use. If the device is in use, a notification will be displayed.

**Table 6** MaxScreenWantAgent

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| pkgName | string | Yes| Name of the package that is automatically started when the reminder arrives and the device is not in use.|
| abilityName | string | Yes| Name of the ability that is automatically started when the reminder arrives and the device is not in use.|

**ReminderRequest** defines the reminder to publish.

**Table 7** ReminderRequest

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| reminderType | ReminderType | Yes| Type of the reminder.|
| actionButton | [ActionButton?,ActionButton?] | No| Action button displayed in the reminder notification.|
| wantAgent | WantAgent | No| Information about the ability that is redirected to when the notification is clicked.|
| maxScreenWantAgent | MaxScreenWantAgent | No| Information about the ability that is automatically started when the reminder arrives. If the device is in use, a notification will be displayed.|
| ringDuration | number | No| Ring duration.|
| snoozeTimes | number | No| Number of reminder snooze times.|
| timeInterval | number | No| Reminder snooze interval.|
| title | string | No| Reminder title.|
| content | string | No| Reminder content.|
| expiredContent | string | No| Extended content to be displayed when the reminder expires.|
| snoozeContent | string | No| Extended content to be displayed when the reminder is snoozing.|
| notificationId | number | No| Notification ID used by the reminder. For details, see **NotificationRequest::SetNotificationId(int32_t id)**.|
| slotType | SlotType | No| Type of the slot used by the reminder. |

**ReminderRequestCalendar** extends **ReminderRequest** and defines a reminder for a calendar event.

For the application to run properly, if both **repeatMonths** and **repeatDays** are not specified, the earliest reminder time must be later than the current time.

**Table 8** ReminderRequestCalendar

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| dateTime | LocalDateTime | Yes| Reminder time, accurate to the minute.|
| repeatMonths | Array&lt;number&gt; | No| Months in which the reminder repeats. The value range is 1 to 12.|
| repeatDays | Array&lt;number&gt; | No| Date on which the reminder repeats. The value range is 1 to 31.|

**ReminderRequestAlarm** extends **ReminderRequest** and defines a reminder for the alarm clock.

**Table 9** ReminderRequestAlarm

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| hour | number | Yes| Hour portion of the reminder time. The value range is 0 to 23.|
| minute | number | Yes| Minute portion of the reminder time. The value range is 0 to 59.|
| daysOfWeek | Array&lt;number&gt; | No| Days of a week when the reminder repeats. The value range is 1 to 7.|

**ReminderRequestTimer** extends **ReminderRequest** and defines a reminder for a scheduled timer.

**Table 10** ReminderRequestTimer

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| triggerTimeInSeconds | number | Yes| Number of seconds in the countdown timer.|

**LocalDateTime** defines a **LocalDateTime** instance.

**Table 11** LocalDateTime

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| year | number | Yes| Year.|
| month | number | Yes| Month.|
| day | number | Yes| Date.|
| hour | number | Yes| Hour.|
| minute | number | Yes| Minute.|
| second | number | No| Second.|


## How to Develop

> **NOTE**
>
> To publish a reminder, your application needs to apply for the **ohos.permission.PUBLISH_AGENT_REMINDER** permission.

Publish a 10-second countdown reminder.

1. Define a countdown timer instance.
   ```
   import reminderAgent from '@ohos.reminderAgent';
   import notification from '@ohos.notification';
   export default {
       // For a JS project:
       // timer: {
       // For an eTS project:
       let timer : reminderAgent.ReminderRequestTimer = {
           reminderType: reminderAgent.ReminderType.REMINDER_TYPE_TIMER,
           triggerTimeInSeconds: 10,
           actionButton: [
               {
                   title: "close",
                   type: reminderAgent.ActionButtonType.ACTION_BUTTON_TYPE_CLOSE
               }
           ],
           wantAgent: {
               pkgName: "com.example.device",
               abilityName: "com.example.device.MainAbility"
           },
           maxScreenWantAgent: {
               pkgName: "com.example.device",
               abilityName: "com.example.device.MainAbility"
           },
           title: "this is title",
           content: "this is content",
           expiredContent: "this reminder has expired",
           notificationId: 100,
           slotType: notification.SlotType.SOCIAL_COMMUNICATION
       }
   }
   ```

2. Publish the reminder.
   ```
   startTimer() {
       reminderAgent.publishReminder(this.timer, (err, reminderId) =>{
           this.printInfo(JSON.stringify(err));
           this.printInfo("reminderId:" + reminderId);
       });
   }
   ```

   HML page code:
   ```
   <div class="container">
       <button type="text" value="publishReminder" onclick="startTimer"></button>
   </div>
   ```

Sample code for defining a calendar reminder instance:

```
// For a JS project:
// calendar: {
// For an eTS project:
let calendar : reminderAgent.ReminderRequestCalendar = {
    reminderType: reminderAgent.ReminderType.REMINDER_TYPE_CALENDAR,
    dateTime: {
        year: 2050,
        month: 7,
        day: 30,
        hour: 11,
        minute: 14,
        second: 30
    },
    repeatMonths: [1],
    repeatDays: [1],
    actionButton: [
        {
            title: "close",
            type: reminderAgent.ActionButtonType.ACTION_BUTTON_TYPE_CLOSE
        },
        {
            title: "snooze",
            type: reminderAgent.ActionButtonType.ACTION_BUTTON_TYPE_SNOOZE
        },
    ],
    wantAgent: {
        pkgName: "com.example.device",
        abilityName: "com.example.device.MainAbility"
    },
    maxScreenWantAgent: {
        pkgName: "com.example.device",
        abilityName: "com.example.device.MainAbility"
    },
    ringDuration: 5,
    snoozeTimes: 2,
    timeInterval: 5,
    title: "this is title",
    content: "this is content",
    expiredContent: "this reminder has expired",
    snoozeContent: "remind later",
    notificationId: 100,
    slotType: notification.SlotType.SOCIAL_COMMUNICATION
}
```

Sample code for defining an alarm reminder instance:

```
// For a JS project:
// alarm: {
// For an eTS project:
let alarm : reminderAgent.ReminderRequestAlarm = {
    reminderType: reminderAgent.ReminderType.REMINDER_TYPE_ALARM,
    hour: 11,
    minute: 14,
    daysOfWeek: [0],
    actionButton: [
        {
            title: "close",
            type: reminderAgent.ActionButtonType.ACTION_BUTTON_TYPE_CLOSE
        },
        {
            title: "snooze",
            type: reminderAgent.ActionButtonType.ACTION_BUTTON_TYPE_SNOOZE
        },
    ],
    wantAgent: {
        pkgName: "com.example.device",
        abilityName: "com.example.device.MainAbility"
    },
    maxScreenWantAgent: {
        pkgName: "com.example.device",
        abilityName: "com.example.device.MainAbility"
    },
    ringDuration: 5,
    snoozeTimes: 2,
    timeInterval: 5,
    title: "this is title",
    content: "this is content",
    expiredContent: "this reminder has expired",
    snoozeContent: "remind later",
    notificationId: 100,
    slotType: notification.SlotType.SOCIAL_COMMUNICATION
}
```