How to queue API calls when you're offline while using Retrofit

Question

I'm using Retrofit in combination with rx-java and have the following question:

Is there a way to queue API calls to a server when the device is offline so that they can be fired when the device is back online again.

Answer 1

EDIT: March 2021 you should now use Work Manager instead.

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You need to add queue to your project in the first place and pipe Retrofit jobs thru that queue. So either create own queue or check if libraries like android-priority-jobqueue fit your requirements (that one also handles persistency of queued jobs, so app kill/reboot is less painful)