How to send HashMap<String,Integer> with Intent to another Activity

It is similar to how it is done with other data types:

Map<String,Integer> hashMap = new HashMap<String, Integer>();
Intent intent = new Intent(this, OtraActivity.class);
intent.putExtra("hashmap", hashMap);
startActivity(intent);

when receiving it Bundlein another it Activitywould be:

Intent intent = getIntent();
Map<String,Integer> hashMap = (Map<String, Integer>)intent.getSerializableExtra("hashmap");