Android Two different type object arraylist add into single arraylist

Question

I try to add two arraylist into single arraylist. all arraylist object type is different.

here my two arraylist-

     ArrayList<NewsItem> topnewslist=new ArrayList<>();
     ArrayList<LatestNewsInfo> latestnewslist=new ArrayLis();

     ArrayList<AllNewsInfo> allnewslist=new ArrayList<>();// add here

    // I try this
   allnewslist.addAll(topnewslist); // not add bcoz differnt type of object
  allnewslist.addAll(latestnewslist); //not add bcoz differnt type of object

// Note: all object data model value is same.

What is best solution for this??

thanks for your feedback. i also try this but when i display all data into listview . then face a problem to set data base of position in adapter class. — Jubayer_cse
– Jubayer_cse, Commented Aug 4, 2016 at 5:06
Main prob is values ovver right. allnewslist.addAll(topnewslist); allnewslist.addAll(latestnewslist); — mujjuraja
– mujjuraja, Commented Aug 4, 2016 at 5:15

sidgate · Accepted Answer · 2016-09-01 23:26:32Z

6

ArrayList<Object> allnewslist=new ArrayList<>();.

Ideally both NewsItem and LatestNewsInfo should inherit common interface, and then you can have the list of this interface.

interface News{}  //can be an abstract class

class NewsItem implements News{
}

class LatestNewsInfo implements News{
}

//edit - define variables to interface instead of actual implementation object 
List<News> allnewslist=new ArrayList<>();

edited Sep 1, 2016 at 23:26

answered Aug 4, 2016 at 5:05

sidgate

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