android网络监测

public static boolean isNetworkConnected(Context context) 

{  

    if (context != null) {  

        ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);  

    NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();  

    if (mNetworkInfo != null) {  

      netConnectType = mNetworkInfo.getType();

      if(netConnectType == ConnectivityManager.TYPE_WIFI)

      { //wifi

      m_preConnectNetType = ConnectivityManager.TYPE_WIFI;

      }

      else if(netConnectType == ConnectivityManager.TYPE_ETHERNET)

      { //以太网

      m_preConnectNetType = ConnectivityManager.TYPE_ETHERNET;   

      }

      else if(netConnectType==ConnectivityManager.TYPE_MOBILE)

      {  //3g网卡

      m_preConnectNetType = ConnectivityManager.TYPE_MOBILE;

      }

      return mNetworkInfo.isAvailable();  

    }  

}  

return false;  

}