Dynamic receivers: android tutorial

Program description:

This is a sample demo program for dynamic receivers in Android.
This program has an activity with 2 buttons. This activity has a dynamic broadcast receiver created in it.
On clicking first button we will send a broadcast with action "DYNAMIC_RECEIVER".
On clicking second button we will register dynamic receiver with an intent filter that has action "DYNAMIC_RECEIVER".

First Activity:

package com.techpalle.b15_dyn_receivers;

import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
 Button b1, b2;
 
 //step1 : create a dynamic b.c.receiver in java code
 private BroadcastReceiver br = new BroadcastReceiver() {
 @Override
 public void onReceive(Context context, Intent intent) {
 Toast.makeText(context, "Dyn receiver triggered", 0).show();
 }
 };
 //step2 : create intent filter
 private IntentFilter inf;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 b1 = (Button) findViewById(R.id.button1); //sending b.c
 b2 = (Button) findViewById(R.id.button2); //register receiver
 
 //prepare intent filter by adding the action.
 inf = new IntentFilter();
 inf.addAction("DYNAMIC_RECEIVER");
 
 b1.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent in = new Intent();
 in.setAction("DYNAMIC_RECEIVER");
 sendBroadcast(in); 
 }
 });
 
 //step3 : register brodacast receiver with intent filter
 b2.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View v) {
 registerReceiver(br, inf);
 }
 }); 
 }
}

xml file for first activity 
File name : activity_main.xml

  xmlns:tools="http://schemas.android.com/tools" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:paddingBottom="@dimen/activity_vertical_margin" 
 android:paddingLeft="@dimen/activity_horizontal_margin" 
 android:paddingRight="@dimen/activity_horizontal_margin" 
 android:paddingTop="@dimen/activity_vertical_margin" 
 tools:context=".MainActivity" > 
 

Manifest file
File name : AndroidManifest.xml

  
  package="com.techpalle.b15_dyn_receivers" 
 android:versionCode="1" 
 android:versionName="1.0" > 
  android:minSdkVersion="8" 
 android:targetSdkVersion="17" /> 
  android:allowBackup="true" 
 android:icon="@drawable/ic_launcher" 
 android:label="@string/app_name" 
 android:theme="@style/AppTheme" > 
  android:name="com.techpalle.b15_dyn_receivers.MainActivity" 
 android:label="@string/app_name" > 
  
  
  
  
  
  
  

Download complete code : Click to download

Android interview questions on dynamic broadcast receivers:
How to create broadcast receiver with out using manifest file?
How to start a receiver only if the application is running?

Tags: android, dynamic receivers, register receiver, button click