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

As alternative to @Jave's suggestions, if you really need the data structure to be a TreeMap, just use the appropriate constructor that takes another map as data source. So on the receiving end (Two) do something like:

public class Two extends Activity {
    @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TreeMap map = new TreeMap((Map) getIntent().getExtras().get("map"));
    }
}

However, depending on your project, you probably don't have to worry about the exact Map implementation. So in stead, you could just cast to the Map interface:

public class Two extends Activity {
    @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Map map = (Map) getIntent().getExtras().get("map");
    }
}