This gist is about clustering consecutive image into a collage/collection

HelloCollage.java

import java.lang.Math;
import java.util.*;

public class HelloCollage {
    private static final String TEXT = "text";
    private static final String IMAGE = "image";
    
    public static void main(String[] args) {
        ArrayList<Item> items = new ArrayList<>();
        items.add(new Item("item0", TEXT));
        items.add(new Item("item1", IMAGE));
        items.add(new Item("item2", IMAGE));
        items.add(new Item("item3", IMAGE));
        items.add(new Item("item4", IMAGE));
        items.add(new Item("item5", IMAGE));
        items.add(new Item("item6", TEXT));
        items.add(new Item("item7", IMAGE));
        items.add(new Item("item8", IMAGE));
        items.add(new Item("item9", TEXT));
        
        ArrayList<String> hiddenItemIds = new ArrayList<>();
        
        for (int i = 0; i < items.size(); i++) {
            // codes below can be placed in adapter
            Item item = items.get(i);
            if (hiddenItemIds.contains(item.id)) {
                System.out.println("hidden");
            } else {
                if (item.tipe.equals(IMAGE)) {
                    ArrayList<Item> collages = new ArrayList<>();
                    collages.add(item);
                    for (int j = i; j < items.size() - 1; j++) {
                        Item nextItem = items.get(j + 1);
                        if (nextItem.tipe.equals(IMAGE)) {
                            collages.add(nextItem);
                        } else {
                            break;
                        }
                    }
                    if (collages.size() > 3) {
                        // insert hidden items
                        for (int k = 1; k < collages.size(); k++) {
                            Item hiddenItem = collages.get(k);
                            hiddenItemIds.add(hiddenItem.id);
                        }
            
                        // show collage
                        System.out.println("collage");
                    } else {
                        System.out.println("image");
                    }
                } else {
                    System.out.println("text");
                }
            }
        }
    }
}

class Item {
  public String id;
  public String tipe;
  
  public Item(String id, String tipe) {
  	this.id = id;
  	this.tipe = tipe;
  }  
}