android 网络动态监听

Question

这是Activity类：

public class MainActivity extends Activity {
private Utils utils;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent();
setContentView(R.layout.linearlayout_activity_main);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION );
utils = new Utils();
intent = registerReceiver(utils, intentFilter);

}
｝

这是Utils类：

public class Utils extends BroadcastReceiver {

private NetworkInfo isNetWorkConnected(Context context){
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    if(networkInfo!= null){
        return networkInfo;
    }
    return null; 
}

@Override
public void onReceive(Context context, Intent intent) {
    NetworkInfo networkInfo = this.isNetWorkConnected(context);
    if(networkInfo != null && networkInfo.isAvailable()){
        System.out.println("有网络");
    }
}

}

问：

我现在想在MainActivity里获取到动态监听网络的状态，也就是要获取networkInfo，请教下，如何做？

Answer 1

ＭａｉｎＡｃｔｉｖｉｔｙ．ｊａｖａ：
package com.example.netlistener2;

import android.support.v7.app.ActionBarActivity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.......
答案就在这里：ａｎｄｒｏｉｄ网络监听
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