Android BroadcastReceiver Usage Guide

A BroadcastReceiver in Android is a component used to receive and process broadcast messages sent by the system or other applications. It allows applications to listen for specific system events or communication between applications.

Some common uses of a BroadcastReceiver include:

1. Changes in network status: monitoring events like connecting, disconnecting, or switching networks.
2. Monitor changes in battery status, such as charging status and battery level.
3. Text messages and phone calls: receiving and processing broadcast messages related to text messages and phone calls.
4. Scheduled tasks: trigger broadcasts at specified times to perform corresponding actions.
5. Custom broadcasts allow components within the application to communicate with each other by sending custom broadcast messages.
6. System events: monitor system events, such as startup, shutdown, and screen unlock.

The steps for using a BroadcastReceiver are as follows:

1. Create a subclass that extends BroadcastReceiver.
2. Register the BroadcastReceiver in the AndroidManifest.xml file, specifying the broadcast messages to receive.
3. Implement the onReceive() method of a broadcast receiver to handle the received broadcast messages.

It is important to note that the onReceive() method of BroadcastReceiver is executed on the main thread, so time-consuming tasks should not be performed there. If time-consuming operations are needed, it is recommended to delegate the work to another thread or use IntentService for handling them.