转：Android检查设备是否联网

 public static boolean isConnect(Context context) {
     ConnectivityManager connectionManager = (ConnectivityManager) context
             .getSystemService(Context.CONNECTIVITY_SERVICE);
     if (connectionManager != null) {
         NetworkInfo info = connectionManager.getActiveNetworkInfo();
         if (info != null && info.isConnected()) {
             if (info.getState() == NetworkInfo.State.CONNECTED) {
                 return true;
             }
         }
     }
     return false;
 }