android broadcastReceiver学习

package com.weilian.broadcasts20160318;

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.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

private LocalBroadcastManager localBroadcastManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");//添加监听的动作
NetworkChangReceiver networkChangReceiver = new NetworkChangReceiver();
registerReceiver(networkChangReceiver,intentFilter);//注册广播

Button b = (Button) findViewById(R.id.btn_sendbroadcast);
Button l = (Button) findViewById(R.id.btn_sendbroadcastlocal);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("com.weipeng.broadcasts20160318");
sendBroadcast(intent);
}
});

localBroadcastManager = LocalBroadcastManager.getInstance(this);
IntentFilter intentFilterlocal = new IntentFilter();
intentFilterlocal.addAction("com.weipeng.broadcasts20160318");//添加动作
localBroadcastManager.registerReceiver(new LocalReceiver(),intentFilterlocal);//注册本地广播

l.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("com.weipeng.broadcasts20160318");
localBroadcastManager.sendBroadcast(intent);
}
});

}
class LocalReceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,"本地广播",Toast.LENGTH_LONG).show();
}
}
class NetworkChangReceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if(networkInfo != null && networkInfo.isAvailable()){
Toast.makeText(context,"有网",Toast.LENGTH_LONG).show();
}else{
Toast.makeText(context,"无网",Toast.LENGTH_LONG).show();
}

}
}
}