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

Sounds like it serializes to a HashMap and that's what you're getting. Guess you're gonna have to settle for a HashMap. Alternatively you can create your own helper class and implement Parcelable, then serialize the key/strings in order.