There seems to be a lot of partial information in this post. Let me try and clear some of it up.
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Google Calendar has a RESTful API which you should be able to use network.request() to access. The keyword there is “should”. I did a quick lookup for their API and its really complex. Their authentications seems to go beyond a simple OAUTH2 setup.
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I don’t think versions of Android are going to have any effect on this. This is simply trying to network to the Google Calendar servers and the mobile OS shouldn’t come into play.
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Unless Google has various pre-built SDK’s for iOS and Android, were one could build a plugin around it, I’m not sure how native builds are going to be of much help here. You can of course use Objective-C/Swift for iOS, Java for Android or C++ for both to do native tasks.
Now this may not help the OP, since we don’t know what Arie wants to do, but for @zombieboffinstudioltd, you should look at:
https://holidayapi.com/ - not free, but super easy to use
https://www.programmableweb.com/category/holidays/api - lists more APIs
https://stackoverflow.com/questions/14203708/is-there-a-comprehensive-api-or-json-xml-list-with-public-bank-holidays-worldwid - more discussion.
https://www.predicthq.com/pricing/api
http://holidayapi.riccardoravaro.com/
I’m a bit confused on the holidayapi.com site, there is plenty of googling that says it’s free, but signing up, it’s clearly not. But the last link seems to say the source is open source, so you potentially could setup your own server. I don’t have time to do a full research on this for you, hopefully this will get you started.
Rob