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I was looking at a scheduling tutorial by Vogella. It mentions the Job Scheduler API that was introduced in API 21 of Android. My question is can it be implemented in APIs lower than 21 (Lollipop) but not less than Android version 3 (Honeycomb)?
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The job scheduler API. The Android 5.0 Lollipop (API 21) release introduces a job scheduler API via the JobScheduler class. This API allows to batch jobs when the device has more resources available.
As mentioned in the previous section, WorkManager internally uses the JobScheduler API on Android 6.0 (API Level 23 – Marshmallow) and above devices. Therefore, there won't be any major differences between the WorkManager and JobScheduler on Android 6.0 and above devices.
JobScheduler is introduced while the Android set limitation on background Execution. It means that the system will automatically destroy the background execution to save battery and memory. So if you want to perform some background job like some network operations no matter your app is running or not.
from now on (after I/O 2015), you can also use new GcmNetworkManager. How to use it and how it works is described here - https://developers.google.com/cloud-messaging/network-manager
It does a lot cool stuff like it persists your tasks trough reboots. On Lolipop it uses JobScheduler, on pre-Lolipop it uses it's own implementation.
EDIT:
An example code on how to use it : https://github.com/jacktech24/gcmnetworkmanager-android-example
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