using Caldav for synchronize - icalendar

I am going to realise service that will redirect user to add my calendar to his calendar list. I am going to use Caldav protocol. How can I add my calendar .ics to user? How can I synchronize all changes on user's calendar?

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Adding an event to a calendar from Flutter app

When user presses a button in my app, I want to save an event to the users calendar. By opening up an already filled calendar app. With Android to add an event to users calendar developer would use an Intent. How do accomplish this with Flutter?
I had in the same situation as you and then I met this library.
Check it out and let me know!
See this blog about adding event to device calender and didn't depend on any other packages.
the package name is add_2_calendar

Can google assistant ask an specific queestion hourly?

I want to create an app that every hour asks me "What are you doing?" through voice notification.
There are a few ways I can respond, "Working", "Playing", etc.
Then it can log it on my calendar. If this is possible, what are the correct terms that are used to describe this? So I can search for documentation.
Would like to build this with Google Actions https://developers.google.com/actions/ and with Google Home
You can try the Push notifications feature to trigger the wanted intent where you will prompt the user for the type of activity he/she is doing.
The user can respond and then your webhook can take care of logging to your activity to your calendar using the Calendar API (Assuming you are referring to Google Calendar)
Note that this feature is currently in Developer preview and will not work in a production environment. Also it is only intended for Google Assistant on mobile devices. Google Home devices do not support any push notification features at the moment.

Sync Facebook Events in Google Calendar programmatically in Android

How to Import Facebook Events in Google Calendar using Android, I have made an app in which i am fetching list of facebook friends with their name, profile pic and birthdays, but now i want to show all upcoming facebook events in Google Calendar...
Please tell me how can i do this?
Easy answer: install the Facebook application
If you want to do it programmatically or you want to be able to view the events on your web calendar, you need to push the Facebook events onto your Google Calendar using the Google Calendar API https://developers.google.com/google-apps/calendar/

How to add events to iPhone native Calendar from Google Calendar?

I want to add events to native calendar from google's calendar programmatically. I have a program that can fetch events from google calendar and show them in table view.How can i add these events to iphone's native calendar?

Showing Badges in iPhone Hybrid Application

We are developing a hybrid iPhone application. It has a webview that loads some mobile website. Website requires user authentication and once user is authenticated we need to show badge count for unread messages.
We are looking to use Push Notification to show badge count but I am not sure how should we register for push notification dynamically once user log-in and de-register once user log-out.
I believe if we can have some way to invoke native class method through javascript then we can achieve it.
Please suggest.
It is very simple whenever user logged-in, post a entry into the db and send notification for the records entered into the db and when user logging-out delete the entry from db