Problem facing in customization of array adapter

I am want to

1) fetch data from a SQL server 2008

2) display fetched data into a list view.

After successfully I tried to display data with a listview, I fetched two column data that's why I tryed to customize my array adapter where is the code 

public class testlistviewAdapter  extends ArrayAdapter<String> {
 public testlistviewAdapter(Context context, String[] foods) {
 super(context, R.layout.testlistview,foods);
    }

@Override
    public View getView(int position,View convertView,ViewGroup parent ){
    LayoutInflater joyinflater=LayoutInflater.from(getContext());
    View customView=joyinflater.inflate(R.layout.listview_adapter_file,parent,false);
    String singleFoodItem=getItem(position);
    TextView firstrow=(TextView)customView.findViewById(R.id.tx);
    TextView secondrow=(TextView)customView.findViewById(R.id.datetime);
    firstrow.setText(singleFoodItem);
    secondrow.setText(singleFoodItem);
    return customView;

}
}

and here is the code from activity part