How to compare and group an ArrayList Object

Question

I am trying to group an ArrayList of event into a list of dates but have no idea how to achieve it.

My goal is to load the grouped data into an ExpandableListView see image below.

I have a list of dates and a list of events too. So, I want to group the events objects into different days based on their date attributes.

Answer 1

You have to convert your data in the way ExpandableListAdapter wants them.

Android has SimpleExpandableListAdapter that can be used but this does not look even a little to the screen you provided. Just for reference here is an Example using such an adapter, so you get a point how it works.

If you want something exactly as the screen you provided you have to implement a custom expandable listiview with ExpandableListAdapter by extending BaseExpandableAdapter

In case the items under the dates does not expand-collapse by pressing then I strongly sugest to look for a ListView with Section Headers the implementations is much easier.