public boolean isWiFiActive(Context context) {
        WifiManager mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInfo = mWifiManager.getConnectionInfo();
        int ipAddress = wifiInfo == null ? 0 : wifiInfo.getIpAddress();
        if (mWifiManager.isWifiEnabled() || ipAddress != 0) {
            return true;
        } else {
            new ConfirmDialog(context, true)
                    .setTtitle("iFarms")
                    .setMessage("wifiをオンにするかどうか。続行しますか？")
                    .setPositiveButton("ok", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
                        }
                    })
                    .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                        }
                    }).create().show();
            return false;
        }
    }