putExtra treeMap returns HashMap cannot be cast to TreeMap android

Question

I need your help, I cannot understand what\'s happening?

I\'m trying to send a TreeMap between 2 activities, the code is something like this:

class O         


        

Answer 1

Instead of casting the result directly to a TreeMap, you can create a new TreeMap and use the putAll()-method:

TreeMap myMap = new TreeMap;
HashMap receivedMap = getIntent().getExtras().get("map");
myMap.putAll(receivedMap);