Android Training (Broadcast Receiver)
Download as PPTX, PDF4 likes786 views
A broadcast receiver is an Android component that allows an app to register to receive notifications for system-wide or application-specific events. When an event occurs, all receivers registered for that event receive an intent in their onReceive() method. For example, apps can register for the ACTION_BOOT_COMPLETED event to perform tasks after system boot. Receivers are lightweight and may be recycled by the system after onReceive() finishes. They can be registered statically in the manifest or dynamically at runtime via Context.registerReceiver(). The BroadcastReceiver class must be extended to implement the onReceive() callback.
Android Training (Broadcast Receiver)
- 2. Broadcast Receiver A broadcast receiver (short receiver) is an Android component which allows you to register for system or application events. All registered receivers for an event will be 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.
- 3. Lifecycle of a broadcast receiver After the onReceive() of the BroadcastReceiver has finished, the Android system can recycle the BroadcastReceiver.
- 4. System broadcasts Several system events are defined as final static fields in the Intent class.
- 6. Implementation A receiver can be registered via the AndroidManifest.xml file. Alternatively to this static registration, you can also register a broadcast receiver dynamically via the Context.registerReceiver() method. The implementing class for a receiver extends the BroadcastReceiver class.
- 7. In AndroidManifest.xml <receiver android:name=“.MyReciver" > intent-filter> <action android:name="android.intent.action.ACTION_POWE R_CONNECTED" /> </intent-filter> </receiver>
- 8. BroadcastReceiver Imp public class MyReciver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Toast.makeText(context, "Yor Mobile Will be Charge… !", Toast.LENGTH_LONG).show(); } }
- 9. Register a broadcast receiver dynamically registerReceiver(new MyReciver(), filter); unregisterReceiver(MyReciver)