Broadcast receiver with implicit intent: Android tutorial

Program description:

This is one more program on how to create a broadcast receiver and how to send a broadcast message by using implicit intent.

This program has an activity, and 2 receivers. Activity has one button. On clicking the button an implicit intent will be used to send a broadcast with action com.techpalle.action.RECEIVER1.
This will trigger Receiver1. In Reciever1 we will send one more broadcast with an implicit intent with action com.techpalle.action.RECEIVER2. While sending this broadcast we will generate a random number between 0 to 100, and send that number as extra information in the intent.
This will trigger Receiver2, which displays random number passed from first broadcast receiver.

This program also has a demo of how to send a broadcast from one broadcast receiver to other broadcast receiver, by using implicit intent.

First Activity:

package com.techpalle.b15_asg_receivers;

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

public class MainActivity extends Activity {
 Button b;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 b = (Button) findViewById(R.id.button1);
 b.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View v) {
 // TODO Auto-generated method stub
 Intent in = new Intent();
 in.setAction("com.techpalle.action.RECEIVER1");
 sendBroadcast(in);
 }
 });
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 // Inflate the menu; this adds items to the action bar if it is present.
 getMenuInflater().inflate(R.menu.main, menu);
 return true;
 }

}

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" > 
  android:id="@+id/textView1" 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:text="@string/hello_world" /> 
 

Broadcast receiver
File name : Receiver1.java

package com.techpalle.b15_asg_receivers;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class Receiver1 extends BroadcastReceiver {

 @Override
 public void onReceive(Context context, Intent intent) {
 // TODO Auto-generated method stub
 Toast.makeText(context, "first app..receiver1", 0).show();
 Intent in = new Intent();
 in.setAction("com.techpalle.action.RECEIVER2");
 int ran = (int) (Math.random()*100);
 in.putExtra("ran", ran);
 context.sendBroadcast(in);
 }
}

Broadcast receiver
File name : Receiver2.java

package com.techpalle.b15_asg_receivers;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class Receiver2 extends BroadcastReceiver {

 @Override
 public void onReceive(Context context, Intent intent) {
 // TODO Auto-generated method stub
 int ran = intent.getExtras().getInt("ran");
 Toast.makeText(context, "First app..recvr2..ran.."+ran, 0).show();
 }
}

Manifest file
File name : AndroidManifest.xml

  
  package="com.techpalle.b15_asg_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_asg_receivers.MainActivity" 
 android:label="@string/app_name" > 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

Download complete code : Click to download

Interview questions on broadcast receivers:
Broadcast receiver runs in which thread?
Is it possible to bind a service from receiver?

Tags: android, broadcast receiver, sendbroadcast, implicit intent