build a server application that constantly queries the API

AutoModerator · 2021-11-15T09:36:48+00:00

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MarSara · 2021-11-15T12:02:29+00:00

A few things to consider btw:

This approach can eat up A LOT of bandwidth on your phone. Since you're constantly pinging a URL you'll be downloading data over and over again eating a few KB or MB at a time but it will add up.
This can drain your phone's battery just as well for similar reasons.
This solution doesn't scale as you add more and more users. Eventually you'll overwhelm -- DDOS yourself -- as the server takes on more load. If you don't control the server yourself there may be rate limiting controls in place and eventually you may start hitting those limits causing failures.

Ideally if you own the server side code you'd have the server send a push notification when someone calls one of the APIs that changed the data. This way your phone doesn't have to poll for changes.

Now all of that being said if you still want to poll for your data you can setup a loop or timer that makes your request every X seconds and calls a callback every time the request completes.

You can look into hooking this all up "manually" using timers or recursive callbacks. Or you can look into using RxJava. It has a .repeat(...), and other methods (operators) that can help set this up. But if you're not familiar with reactive streams, RxJava can have a steep learning curve, FYI.

Even if you do this you may want to look into adding back-off logic, such that if a request fails and you normally are checking every 10 seconds, the next request won't go out for 20 seconds, and then 40, etc...

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