Multiple Array list get in one array List in android

Question

My code using many array list with custom model, now i want to store all array list in one Seprate arrayList, how it is possible.

public ArrayList<TwitterFeedCustomModel> mFacebookFeedCustomModelArrayList = new ArrayList<>();
public ArrayList<TwitterFeedCustomModel> mTwitterFeedCustomModelArrayList = new ArrayList<TwitterFeedCustomModel>();
public ArrayList<LinkedInFeedCustomModel> mLinkedInFeedCustomModelArrayList = new ArrayList<LinkedInFeedCustomModel>();
public ArrayList<InstagramFeedCustomModel> mInstagramFeedCustomModelArrayList = new ArrayList<InstagramFeedCustomModel>();
public ArrayList<YouTubeFeedCustomModel> mYouTubeFeedCustomModelArrayList = new ArrayList<YouTubeFeedCustomModel>();
public ArrayList<BlogFeedCustomModel> mBlogFeedCustomModelArrayList = new ArrayList<BlogFeedCustomModel>();

All arraylist have seprate data, now i want to store all array list data in one arrayList, how we can do please help me.

How about using generics for creating the mother ArrayList ? — CodeWalker
– CodeWalker, Commented Oct 25, 2016 at 10:58
the types are different you can join them in an arraylist<fatherType> that all these types extend that fatherClass. you cant achieve that without casting. — Amir Ziarati
– Amir Ziarati, Commented Oct 25, 2016 at 10:59
Do you want to replace all this with a single list of use these ArrrayLists to produce a new list containing all? — S Praveen Kumar
– S Praveen Kumar, Commented Oct 25, 2016 at 11:05
the types will be casted and you wont be able to find the types easily after doing this !!!! you can use a list of objects like ArrayList<Object> and add all the lists into that. — Amir Ziarati
– Amir Ziarati, Commented Oct 25, 2016 at 11:07

Aman Srivastava · Accepted Answer · 2016-10-25 11:03:20Z

1

ArrayList<Object> singleArrayList = new ArrayList<> ();
singleArrayList.add(mFacebookFeedCustomModelArrayList);
singleArrayList.add(mTwitterFeedCustomModelArrayList);
singleArrayList.add(mLinkedInFeedCustomModelArrayList);
......

while retrieving data you have to do type check.

answered Oct 25, 2016 at 11:03

Aman Srivastava

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11 Comments

Hitesh Tarbundiya Over a year ago

after above implementation, how to get all data ?

Aman Srivastava Over a year ago

int index =0;  if( singleArrayList.get(index) instanceof ArrayList<TwitterFeedCustomModel>)      {  mFacebookFeedCustomModelArrayList = singleArrayList.get(index) ; ........}

like wise.

Hitesh Tarbundiya Over a year ago

hi friend, your solution is correct, but i want to all arraylist data in one arraylist, on that single array list iwant to perform many operation like sorting, filter etc, so it is possible to without object, because this one is not help full for me

Hitesh Tarbundiya Over a year ago

this one is doesn't meaning for implementation, because we check every time which object is, so same as my implementation,

Aman Srivastava Over a year ago

ok. ArrayList<Object> singleArrayList = new ArrayList<> (); singleArrayList.addAll(mFacebookFeedCustomModelArrayList);

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A_Sk · Accepted Answer · 2016-10-25 11:34:30Z

0

Create a New class Say NewT that will be super class of TwitterFeedCustomModel, LinkedInFeedCustomModel,InstagramFeedCustomModel,YouTubeFeedCustomModel,BlogFeedCustomModel and make new ArrayList of NewT(newly created class)

edited Oct 25, 2016 at 11:34

A_Sk

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answered Oct 25, 2016 at 11:02

Abhishek Sharma

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