Android Broadcast Receiver and Intent Filter

Question

I'm new to android platform.please, help me how Broadcast Receiver and Intent Filter behave in android.please, explain in a simple line or using example.thanks in advance ...

Answer 1

A broadcast receiver is a class in your Android project that is responsible for receiving all intentions that are sent by other actions using android.content.ContextWreapper.sendBroadcast(Intent intent)

In the manifest file that you receive, you must declare which is your broadcast receiver, for example:

 <receiver android:name="xyz.games.pacman.network.MessageListener"> <intent-filter> <action android:name="xyz.games.pacman.controller.BROADCAST" /> </intent-filter> </receiver> 

As you can see, you also define an intent filter here, that is, what intentions should be accepted by the broadcast receiver.

Then you need to define a class that extends BroadcastReceiver. This is the class that you defined in the manifest file:

 public class MessageListener extends BroadcastReceiver { /* (non-Javadoc) * @see android.content.BroadcastReceiver#onReceive(android.content.Context, android.content.Intent) */ @Override public void onReceive(Context context, Intent intent) { ... } 

Here, all intentions that are passed through the filter are accepted, and you can access them using the parameter passed in the method call.

Answer 2

A BroadcastReceiver can be registered in two ways: dynamic or static . Static is nothing more than an action declaration through intent-filter in AndroidManifest.xml to register a new BroadcastReceiver class. Dynamic registers a receiver from another class. The intent-filter function determines which action should be taken.

To create a BroadcastReceiver, you need to extend the BroadcastReceiver class and override the onReceive(Context,Intent) method. Here you can check incoming intentions with Intent.getAction() and execute the code accordingly.

As a new class, static will be

 public class Reciever1 extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { String str = intent.getAction(); if(str.equalsIgnoreCase("HELLO1")) { Log.d("Abrar", "reciever...."); new Thread() { public void run() { Log.d("Abrar", "reciever...."); System.out.println("Abrar"); } }.start(); } 

or, if it is placed in an existing class, it is dynamically called

 intentFilter = new IntentFilter(); intentFilter.addAction("HELLO1"); //---register the receiver--- registerReceiver(new Reciever1(), intentFilter); 

Answer 3

BroadcastReceiver : The “gateway” with which your application tells the Android OS that your application is interested in receiving information.

Intent-Filter : Works with BroadcastReceiver and reports the “What” that it wants to receive. For example, your application wants to receive information about the battery level.