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When to use a broadcast receiver in Android?

Broadcast in android is the system-wide events that can occur when the device starts, when a message is received on the device or when incoming calls are received, or when a device goes to airplane mode, etc. Broadcast Receivers are used to respond to these system-wide events.

What are the messages from a broadcast receiver?

Broadcast Receivers simply respond to broadcast messages from other applications or from the system itself. These messages are sometime called events or intents.

How to register a receiver for an event in Android?

All registered receivers for an event are notified by the Android runtime once this event happens. For example, applications can register for the ACTION_BOOT_COMPLETED system event which is fired once the Android system has completed the boot process. 1.2. Implementation A receiver can be registered via the AndroidManifest.xml file.

What does sticky broadcast mean on Android phone?

There are several system generated events defined as final static fields in the Intent class. The following table lists a few important system events. Sticky broadcast containing the charging state, level, and other information about the battery. Indicates low battery condition on the device. Indicates the battery is now okay after being low.

Use A Broadcast Receiver For Background Services In Android. As an Android developer, you’ll often run into the scenario where you need to perform tasks and display notifications for your app in the background. To retain battery power on our users device we are going to run background tasks using a broadcast receiver.

How does the state of a broadcastreceiver affect a process?

The state of your BroadcastReceiver (whether it is running or not) affects the state of its containing process, which can in turn affect its likelihood of being killed by the system. For example, when a process executes a receiver (that is, currently running the code in its onReceive () method), it is considered to be a foreground process.

What is the broadcast receiver doing when it wakes up?

So what exactly is the broadcast receiver doing when it wakes up? It is just calling our background service intent where we do all of our heavy lifting. You can see in the above code that all of our variables get initialized in the onCreate and the service starts to run in the onStartCommand method.

How to register a background receiver in Android?

If you want a background receiver, you need to register it inside the AndroidManifest(with intent filter), add an IntentServiceand start it when you receive a broadcast in the receiver. Here is a tutorial, you are interested in chapter 3.