Android:QueryingNetworkReachability via http://goo.gl/f561vx

public static boolean haveNetworkConnection(Context context) {
    ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if(activeNetwork == null) return false;
    return activeNetwork.isConnected();
}