Android - Utilizing BroadcastReceiver to check for Device status updates [i.e. Location (GPS&Net)/Network (Wifi&Mobile)/Battery (Boot&Low)] in Realtime

Android - Utilizing BroadcastReceiver

BroadcastReceiver is an application component in which you can send broadcasts (via intents) from one component and receive it in another. 
Simply put, it is a great way of preparing your app to listen out for changes to your mobile in realtime actively (by users) or passively (Operating System).
In this example we will demonstrate how to implement both a minimal and optimal implementation of the BroadcastReceiver.
This solution below checks specifically for Device Location State updates.

Minimal Solution:
Go to URL https://github.com/Aeonitis/lh-and/commit/6a4c271736a32ef107e88fd5575108787cbdf25e
or search for my commit '6a4c271736a32ef107e88fd5575108787cbdf25e' on Github, in case I changed my repo name

Optimal Solution (using interfaces):
Go to URL https://github.com/Aeonitis/lh-and/commit/8f4a6f2d90b6203a3a9a5eec10585ad089190f14
or search for my commit '8f4a6f2d90b6203a3a9a5eec10585ad089190f14' on Github, in case I changed my repo name

For receivers checking other device status updates e.g. Network State

They are received on function onReceive() & sent by sendBroadcast(Intent).
You can either:-
1. dynamically register an instance of this class with Context.registerReceiver() or 
2. statically declare an implementation with the <receiver> tag in your AndroidManifest.xml.
My solutions are both dynamic

Source(s): https://developer.android.com/reference/android/content/BroadcastReceiver.html