Question

i have problem in data binding in expandable list view. here i use

ArrayList<ExpandListGroup> list = new ArrayList<ExpandListGroup>();

ExpandListGroup for data binding. but in sum 2d array there is null value.Data is coming dynamically .

eg:

String [] [] array1 = [[one,two,three,null],[seven,six,null]] ;

I want to remove the null column from this two dimensional array

Answer 1

You need to take a intermediate arraylist and result array and follows the below steps.

1. First copy the source array(containing null) into arraylist.
2. Then remove null from arraylist

3. Then create new array and copy data from arraylist to array.

   private void remove_nulls()
   {

        String [] [] array1 = {{"one","two","three",null},{"seven","six",null}} ;
        ArrayList<ArrayList<String>> contact = new ArrayList<ArrayList<String>>();
   
        for(int i=0;i<array1.length;i++)
        {
            ArrayList<String> con = new ArrayList<String>();
            for(int j=0;j<array1[i].length;j++)
            {
   
                if(array1[i][j]!=null)
                con.add(array1[i][j]);
            }
            if(con.size()>0)
                contact.add(con);
        }
        String [] [] array2 = new String[array1.length][];
        for(int i=0;i<contact.size();i++)
        {
            array2[i]=new String[contact.get(i).size()];
            for(int j=0;j<contact.get(i).size();j++)
            {
                array2[i][j]=contact.get(i).get(j);
            }
        }
   
    }