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
API | Description |
---|---|
function publishReminder(reminderReq: ReminderRequest, callback: AsyncCallback<number>): void; function publishReminder(reminderReq: ReminderRequest): Promise<number>; |
Publishes a scheduled reminder. 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<void>): void; function cancelReminder(reminderId: number): Promise<void>; |
Cancels a specified reminder. (The value of reminderId is obtained from the return value of publishReminder.) |
function getValidReminders(callback: AsyncCallback<Array<ReminderRequest>>): void; function getValidReminders(): Promise<Array<ReminderRequest>>; |
Obtains all valid reminders set by the current application. |
function cancelAllReminders(callback: AsyncCallback<void>): void; function cancelAllReminders(): Promise<void>; |
Cancels all reminders set by the current application. |
function addNotificationSlot(slot: NotificationSlot, callback: AsyncCallback<void>): void; function addNotificationSlot(slot: NotificationSlot): Promise<void>; |
Registers a NotificationSlot instance to be used by the reminder. |
function removeNotificationSlot(slotType: notification.SlotType, callback: AsyncCallback<void>): void;function removeNotificationSlot(slotType: notification.SlotType): Promise<void>; | Removes a NotificationSlot instance of a specified type. |
ActionButtonType enumerates types of buttons displayed in a reminder notification.
Table 2 ActionButtonType enumeration
Name | Description |
---|---|
ACTION_BUTTON_TYPE_CLOSE | Close button, which can be tapped to stop the reminder alert tone, close the reminder notification, and cancel the reminder snoozing. |
ReminderType enumerates the reminder types.
Table 3 ReminderType enumeration
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 instance
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 instance
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 instance
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 instance
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 the API reference of the NotificationRequest.setNotificationId(int id) method. |
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 instance
Name | Type | Mandatory | Description |
---|---|---|---|
dateTime | LocalDateTime | Yes | Reminder time, accurate to the minute. |
repeatMonths | Array<number> | No | Months in which the reminder repeats. The value range is 1 to 12. |
repeatDays | Array<number> | 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 instance
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<number> | 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 instance
Name | Type | Mandatory | Description |
---|---|---|---|
triggerTimeInSeconds | number | Yes | Number of seconds in the countdown timer. |
LocalDateTime defines a LocalDateTime instance.
Table 11 LocalDateTime instance
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.
-
Define a countdown timer instance.
import reminderAgent from '@ohos.reminderAgent'; import notification from '@ohos.notification'; export default { // In JS Project: // timer: { // In 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 } }
-
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:
// In JS Project:
// calendar: {
// In 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:
// In JS Project:
// alarm: {
// In 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
}