How to sort groups and children Expandable listview in Android?

Question

I have two tables in mysql which bind \'Categories\' and \'products\' through ids \'id_catprods\' and \'ID_Cat\'. So far so good, I\'m working on Android with \"ExpandableListVi

Answer 1

Use

 Collections.sort(arraylist); 

or

list.sort(String::compareToIgnoreCase);

This will sort your arraylist and If you have Expandable list you have to use

        Collections.sort(arraylist, new Comparator(){
            @Override
            public int compare(Modelclass o1, Modelclass o2) {

                Collections.sort(o1.getsubarraylist(), new Comparator(){
                    @Override
                    public int compare(Modelclass o1, Modelclass o2) {
                    return o1.getName().compareToIgnoreCase(o2.getName());
                       }
                    });

               Collections.sort(o2.getsubarraylist(), new Comparator(){
                    @Override
                    public int compare(Modelclass o1, Modelclass o2) {
                    return o1.getName().compareToIgnoreCase(o2.getName());
                       }
                    });

             return o1.getName().compareToIgnoreCase(o2.getName()); 
// *This Sorts The Group's if you don't wanna sort group simply return 0*;
          }
        });

NOTE:- o1.getsubarraylist() & o2.getsubarraylist() is Child list's of a expandable list, Just add inner Collections.sort() for sorting expandable list's

or if you have Simple String arraylist

         Collections.sort(arraylist, new Comparator(){
            @Override
            public int compare(String o1, String o2) {
             return o1.compareToIgnoreCase(o2);
              }
           });

I hope this helps someone in need....