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A Broadcast Reciever is an android component which allows us to register the system or application events. A Broadcast Reciever is simply called as Reciever. When an event happens the all registered receivers are notified.
For example, ACTION_BOOT_COMPLETED system event which is fired once the Android system has completed the boot process.
We can register a Reciever via two ways: static and dynamic.
Registering via AndroidManifest.xml is the static way and for dynamic registration, we can use Context.registerReceiver() method.
For implementing receivers, extends the BroadcastReceiver class.
Android system calls the onReceive() method If the event for which the broadcast receiver has registered happens.
Several system events are defined as final static fields in the Intent class. Other Android system classes also define events, e.g., the TelephonyManager defines events for the change of the phone state.
On system reboot, data can be automatically synchronized when a service started. For this, we can register a receiver for the android.intent.action.BOOT_COMPLETED system event. This requires the android.permission.RECEIVE_BOOT_COMPLETED permission in AndroidManifest.xml.
If our application is installed on sd-card then register it for the android.intent.action.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE event.
“Android API level 11 the user needs to have started the application at least once before an application can receive android.intent.action.BOOT_COMPLETED events.”
A pending intent is a token that you give to another application (e.g., notification manager, alarm manager or other 3rd party applications), which allows this other application to use the permissions of your application to execute a predefined piece of code.
To perform a broadcast via a pending intent, get a PendingIntent via the getBroadcast() method of the PendingIntent class. To perform an activity via a pending intent, you receive the activity via PendingIntent.getActivity().
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