How to Update Cell Table Footer Dynamically

I am trying to add footer to the celltable and finding hard time to change the celltable footer dynamically but i am able to add while creating columns like below

cellTable.addColumn(qty, "Qty",Integer.toString(totalQty)); 

This is not i am looking for,Is there any way to set footer to cell table dynamically.Any help?

You need to implement a custom Header and add it to the column which should contain that footer. For example:

public class QuantityFooter extends Header<Number> {

    private final Number totalQty;

    public QuantityFooter(Number totalQty) {
        super(new NumberCell());
        this.totalQty = totalQty;
    }

    public void setQuantity(Number totalQty) {
        this.totalQty = totalQty;
    }

    @Override
    public Number getValue() {
        return totalQty;
    }
}

Then add it to the column:

QuantityFooter quantityFooter = new QuantityFooter(0);
cellTable.addColumn(qty, new TextHeader("Qty"),quantityFooter ); 

When you need to update the footer you just call quantityFooter.setQuantity(10) and you probably need to redraw the headers/footers with redrawHeader() and redrawFooters()