Introduction
This article explains the Broadcast Receiver in Android.
A Broadcast Receiver is a receiver that helps to catch Android operating system specific events. A Broadcast Receiver is an Android component that listens for device orientation changes like SMS message received, phone call received, battery status received and WiFi comes on.
A Broadcast Receiver is used when a call is received. We then save the call details in our SQLIte database. When the phone changes its state after receiving a call then the receiver notices the state change and saves the call into the SQLIte database.
How to create a Broadcast Receiver
There are two ways to register and create a Broadcast Receiver. The first way is by the Android Manifest.xml file.
<receiver
android:name="BatteryChanged">
<intent-filter >
<action android:name="android.intent.action.BATTERY_CHANGED"/>
</intent-filter>
</receiver>
In Java file
On firing of the action android:name="android.intent.action.BATTERY_CHANGED" the onRecieve method will automatically call:
public class BatteryCheck extends BroadcastReceiver
{
public void onRecieve(Context context,Intent intent)
{
//Battery status will be received
}
}
Second way is to register dynamically
private BroadcastReceiver reciever=new BatteryChange();
private IntentFilter filter=new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
this.registerReciever(receiver,filter);
public class BatteryChange extends BroadcastReceiver
{
public void onReceive(Context context,Intent intent)
{
}
}
How to create a custom event and BroadcastReciever
Register a BroadcastReciever in the Android menifest.xml file like this:
<receiver
android:name="Reciever">
<intent-filter>
<action android:name="ax.example.mybroadcast"/>
</intent-filter>
</receiver>
Create a Java file and write this:
class Reciever extends BroadcastReceiver
{
public void onRecieve(Context context,Intent intent)
{
}
}
Send Broadcast event
Send a broadcast event using the following:
Intent intent =new Intent();
intent.setAction("ax.example.myBroadcast");
sendBroadCast(intent);
Another way to define a receiver
public class RecieverExample extends Activity {
private BroadcastReceiver receiver = new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
}
};
private IntentFilter filter = new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onResume() {
this.registerReceiver(receiver, filter);
super.onResume();
}
@Override
protected void onPause() {
this.unregisterReceiver(receiver);
super.onPause();
}
}
Image of BroadcastReciever
![android_broadcast_intent.jpg]()