ExpandableLists in Android, I want to allow only one parent list to expand at a time

Question

I want to make only one item in the parent list expand at a time, my code for the onCreate is currently the following. (It works as I want, But the method to allow only one pare

Answer 1

The problem was solved by creating a public explist variable called list, and then referencing it to the adapter in view with the following call.

list = getExpandableListView(); 

The expand method before was crashing the app because of this. After refferencing the list.collapsegroup in, it worked fine.

public void onGroupExpand(int groupPosition) { 
                    System.out.println("GROUP LISTENER WORKS?");
                    if(adptr=="expListAdapter"){
                        int len = expListAdapter.getGroupCount();
                        //System.out.println(len);
                        for (int i = 0; i < len; i++) {
                            if (i != groupPosition) {
                            list.collapseGroup(i);
                            }
                        }

                    }
                    else if(adptr=="expListAdapter2"){
                        int len = expListAdapter2.getGroupCount();
                        for (int i = 0; i < len; i++) {
                            if (i != groupPosition) {
                            list.collapseGroup(i);
                            }
                        }
                        //System.out.println(len);
                    }
                    else if(adptr=="expListAdapter3"){
                        int len = expListAdapter3.getGroupCount();
                        for (int i = 0; i < len; i++) {
                            if (i != groupPosition) {
                            list.collapseGroup(i);
                            }
                        }

                    }
            }