Question

In Android, I have a Set, and I want to turn it into a sorted List.

How to do it with Collections.sort()?

protected List<PackageInfo> doInBackground(Void... params) {

        Set<PackageInfo> adPackages = new HashSet<PackageInfo>();
        //ArrayList<PackageInfo> adPackages = new ArrayList<PackageInfo>();

        [..............]

        return new ArrayList<PackageInfo>(adPackages);
        //return adPackages;
    }

Answer 1

List has a constructor which allows you to create it using any Collection. Then use the Collections.sort(List list) method.

E.g.

Set<String> set = new HashSet<String>();
set.add("This is a unsorted set");
List<String> list = new ArrayList<String>(set);
Collections.sort(list); // or Collections.sort(list, Comparator);

Cheers.