BroadCast(sent,receiver,register) / onPause / onResume

import android.app.Activity;

import android.app.Fragment;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

        MyBroadcastReceiver myReceiver;

        IntentFilter intentFilter;

        @Override

        protected void onCreate(Bundle savedInstanceState) {

                super.onCreate(savedInstanceState);

                setContentView(R.layout.activity_main);

                if (savedInstanceState == null) {

                        getFragmentManager().beginTransaction()

                                        .add(R.id.container, new PlaceholderFragment()).commit();

                }

               

                myReceiver=new MyBroadcastReceiver();

                intentFilter=new IntentFilter("MY_SPECIFIC_ACTION");

        }

       

       

        @Override

        protected void onPause() {         

                super.onPause();

                unregisterReceiver(myReceiver);

        }

        @Override

        protected void onResume() {              

                super.onResume();

                registerReceiver(myReceiver, intentFilter);

        }

        @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;

        }

        @Override

        public boolean onOptionsItemSelected(MenuItem item) {

                // Handle action bar item clicks here. The action bar will

                // automatically handle clicks on the Home/Up button, so long

                // as you specify a parent activity in AndroidManifest.xml.

                int id = item.getItemId();

                if (id == R.id.action_settings) {

                        return true;

                }

                return super.onOptionsItemSelected(item);

        }

        /**

         * A placeholder fragment containing a simple view.

         */

        public static class PlaceholderFragment extends Fragment {

                public PlaceholderFragment() {

                }

                @Override

                public View onCreateView(LayoutInflater inflater, ViewGroup container,

                                Bundle savedInstanceState) {

                        View rootView = inflater.inflate(R.layout.fragment_main, container,

                                        false);

                        Button sendBtn=(Button)rootView.findViewById(R.id.sendBtn);

                        sendBtn.setOnClickListener(new View.OnClickListener() {

                               

                                @Override

                                public void onClick(View v) {

                                        Intent i=new Intent("MY_SPECIFIC_ACTION");

                                        i.putExtra("data", "fromSendBroadcast");

                                        PlaceholderFragment.this.getActivity().sendBroadcast(i);

                                }

                        });

                        return rootView;

                }

        }

       

        public class MyBroadcastReceiver extends BroadcastReceiver{

                @Override

                public void onReceive(Context arg0, Intent arg1) {

                        Toast.makeText(arg0, arg1.getStringExtra("data"), Toast.LENGTH_SHORT).show();

                       

                }

               

        }

}