Create Dynamic Data set for ExpandableListView

I have a table like following model, I fetched this table from sq-lite database and put it in an Array List.

group1------child1  
group1------child2  
group1------child3  
group2------child1  
group2------child2 

Now I want to create Expandable List with custom Adapter and put this data dynamically in it. How should i create hash-map for it?