private boolean goToNetWork() {

        // TODO Auto-generated method stub

        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo info = connectivityManager.getActiveNetworkInfo();

        if(info == null || !info.isAvailable()){

            new AlertDialog.Builder(this).setTitle("提醒：").setMessage("抱歉，目前无法连接网络。\n请检查您的手机网络连接！").setPositiveButton("打开网络设置",new DialogInterface.OnClickListener() {

                @Override

                public void onClick(DialogInterface dialog, int which) {

                    // TODO Auto-generated method stub

                    Intent intent=null;

                    //判断手机系统的版本  即API大于10 就是3.0或以上版本

                    if(android.os.Build.VERSION.SDK_INT>10){

                        intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);

                    }else{

                        intent = new Intent();

                        ComponentName component = new ComponentName("com.android.settings","com.android.settings.WirelessSettings");

                        intent.setComponent(component);

                        intent.setAction("android.intent.action.VIEW");

                    }

                    startActivity(intent);

                }

                }).setNegativeButton("联知道了!",null).show();

            return false;

        }

        else{

            //new AlertDialog.Builder(this).setMessage("网络正常可以使用").setPositiveButton("Ok", null).show();

            return true;

        }