package com.example.broadcasttest2;

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

public class MyBroadcastReceiver extends BroadcastReceiver {
 
 @Override
 public void onReceive(Context context,Intent intent) {
  Toast.makeText(context, "received in MyBroadcastReceiver", Toast.LENGTH_SHORT).show();
 }
 
}

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

      ..........................................
        
        <receiver android:name=".MyBroadcastReceiver">
            <intent-filter>
                <action android:name="com.example.broadcasttest.MY_BROADCAST"/>
            </intent-filter>
        </receiver>
    </application>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 ..........................................
        android:id="@+id/button"
        android:layout_width = "match_parent"
        android:layout_height = "wrap_content"
        android:text = "Send Broadcast"
        />
</LinearLayout>

package com.example.broadcasttest2;

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

public class MainActivity extends Activity {
 
 private IntentFilter intentFilter;
 
 private NetworkChangeReceiver networkChangeReceiver;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
    
  Button button = (Button) findViewById(R.id.button);
  button.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    Intent intent = new Intent("com.example.broadcasttest.MY_BROADCAST");
    sendBroadcast(intent);
   }
  });
 } 
}