怎么广播没反应呢...模拟器上.真机上都没

[m0_37032016]

package com.example.administrator.broacasttest;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
private IntentFilter intentFilter;
private NetWorkChangeReceiver netWorkChangeReceiver;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intentFilter = new IntentFilter();
intentFilter.addAction("android.net.com.CONNECTIVITY_CHANGE");
netWorkChangeReceiver=new NetWorkChangeReceiver();
registerReceiver(netWorkChangeReceiver,intentFilter);
}

@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(netWorkChangeReceiver);
}

class NetWorkChangeReceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "newtwork change", Toast.LENGTH_SHORT).show();
}
}
}