/**
     * Checks if the connection is enabled.
     * @param manager ConnectionManager
     * @return true if the connection is enabled
     */
    public static boolean checkConnection (ConnectivityManager manager)
    {
        NetworkInfo info = manager.getActiveNetworkInfo();
        if (info == null || (info != null && !info.isConnected()))
            return false;
        return true;
    }
    
    /**
     * Merges translated strings (from {@link R.string}) and normal ones (CharSequence)
     * @param res resources of your activity (use getResources())
     * @param array of string or integers (or both)
     * @return every string in the array in one string
     */
    public static String mergeStrings (Resources res, Object... strings)
    {
        StringBuilder sBuilder = new StringBuilder();
        for (Object str : strings)
        {
            if (str instanceof Integer)
                sBuilder.append (res.getString ((Integer)str));
            else if (str instanceof CharSequence)
                sBuilder.append ((CharSequence)str);
        }
        return sBuilder.toString();
    }

    /**
     * Shows a Toast with the duration of LENGTH_SHORT.
     * @param activity An activity.
     * @param msg The desidered message.
     */
    public static void displayToast (final Activity activity, final Object msg)
    {
        activity.runOnUiThread (new Runnable() {
            @Override
            public void run ()
            {
                if (msg instanceof Integer)
                    Toast.makeText (activity, (Integer) msg, Toast.LENGTH_SHORT).show();
                else
                    Toast.makeText (activity, (String) msg, Toast.LENGTH_SHORT).show();
            }
        });
    }
    
    /**
     * Alias for displayToast (..., mergeStrings (data)).
     * @param activity An activity.
     * @param data Data to pass to mergeStrings
     */
    public static void displayToast (Activity activity, Object... data)
    {
        displayToast (activity, mergeStrings (activity.getResources(), data));
    }