hasConnection

    public boolean hasNetwork() {
        ConnectivityManager connectivityManager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivityManager == null) {
            return false;
        }

        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        if (networkInfo == null) {
            return false;
        }

        switch (networkInfo.getType()) {
            case ConnectivityManager.TYPE_ETHERNET:
            case ConnectivityManager.TYPE_WIFI:
            case ConnectivityManager.TYPE_WIMAX:
            case ConnectivityManager.TYPE_MOBILE:
                return true;
            case ConnectivityManager.TYPE_BLUETOOTH:
            case ConnectivityManager.TYPE_DUMMY:
            case ConnectivityManager.TYPE_MOBILE_DUN:
            case ConnectivityManager.TYPE_MOBILE_HIPRI:
            case ConnectivityManager.TYPE_MOBILE_MMS:
            case ConnectivityManager.TYPE_MOBILE_SUPL:
            default:
                return false;
        }
    }