Put HashMap<Integer, List<Integer>> in savedInstanceState

Question

I have a problem with adding values in savedInstanceState in Android. I tried to find solution on the internet, but I cannot seem to find a solution. Maybe some of you might know where the problem is. I need to put HashMap> to savedInstanceState, and retrieve that onCreate method. Has anyone encountered and solved this problem? Thank you for your time.

Answer 1

you can use putSerializable. E.g.

savedInstanceState.putSerializable("KEY", hashMapInstance);