EASY WAY 2 IN

From Android version 8.0 (Oreo) on wards there are limitations in executing background services and there are some limitations in receiving certain broadcasts. The android team implement all these restrictions to improve app performance and device battery life. If your app target API 26 then you have to consider some other mechanisms to do your background job.  Fortunately there is JobScheduler API that solve the problem regarding the background job limitations in newer versions of android. Google suggests Android App developers to use the JobScheduler API for their background job execution rather than using a background service.  But the problem is that the android framework JobScheduler API is available from android API version 21(Lollipop) and above. If your app support start from Lollipop and above then you can go for the framework JobScheduler API for your background job. If your App support start from android API lower than 21 then you can use the Firebase JobDispat