Broadcast Receiver Introduction in Android

A broadcast receiver is a component that responds to system-wide broadcast announcements. Many broadcasts originate from the system—for example, a broadcast announcing that the screen has turned off, the battery is low, or a picture was captured. There are two ways to use broad cast receiver in android --

• One is using dynamically in activity
• Second to register through manifest

Using dynamically in activity
Register broadcast receiver Via dynamically ( Run time )

 
// Create reciever object
  private BroadcastReceiver the_receiver = new PhoneCall();
  // Set When broadcast event will fire.
  private IntentFilter filter = new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED);
  // Register new broadcast receiver
  this.registerReceiver(the_receiver, filter);
  // Reciever class which extends BroadcastReceiver
  public class PhoneCall extends BroadcastReceiver {
  public void onReceive(Context context, Intent intent) {
  // Phone call state change then this method will automaticaly called
  }
   }

Register through manifest
Register broadcast receiver Via the AndroidManifest.xml file.

When android.intent.action.PHONE_STATE Event will fire ( call recieved/pick/end ), then onReceive method in PhoneCall.java file will automaticaly call.
Now Create PhoneCall.java file

 
// Reciever class which extends BroadcastReceiver
   public class PhoneCall extends BroadcastReceiver {
      public void onReceive(Context context, Intent intent) {
       // Phone call state change then this method will automaticaly called
       }}

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