/**
	 * isNetworkAvailable() TRUE wenn eine Datenverbindung vorhanden ist
	 *
	 * @param mixed activity
	 * @return
	 */
	public static boolean isNetworkAvailable(Activity activity) {
		ConnectivityManager connectivity = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivity == null) {
			return false;
		} else {
			NetworkInfo[] info = connectivity.getAllNetworkInfo();
			if (info != null) {
				for (int i = 0; i < info.length; i++) {
					if (info[i].getState() == NetworkInfo.State.CONNECTED) {
						return true;
					}
				}
			}
		}
		return false;
	}