检查网络连接

import android.content.Context;

 import android.net.ConnectivityManager;

 import android.net.NetworkInfo;



 public class NetUtil {

public static boolean checkNet(Context context)

{

   try 

   { 

       ConnectivityManager connectivity = (ConnectivityManager) context 

               .getSystemService(Context.CONNECTIVITY_SERVICE); 


       if (connectivity != null) { 

           

           NetworkInfo info = connectivity.getActiveNetworkInfo();    

           if (info != null&& info.isConnected()) 

           { 

              

               if (info.getState() == NetworkInfo.State.CONNECTED)  

               { 

                   return true; 

               }        

           }        

        } 

   } 

   catch (Exception e) 

   { 

   
 e.printStackTrace();

   

   } 

     return false; 

}

 }