Develop Reference

Creating an expandable Recycler View

I have gone through other questions as well, but couldn't figure out something. I want to create a User list using the Expandable RecyclerView. The way I want it to be
My RecyclerView part is all done. Now my question is how can I achieve this expandable RecyclerView part programmatically. And if I can do this using any library which one would be best to use.

You can use this library to achieve expandable recyclerview.
https://github.com/thoughtbot/expandable-recycler-view

Parse different data through the activity in the same activity

I am building an E-Commerce App and I have an activity showing image slider, description and related items, and in image slider I have put an arrow to change the product on the arrow click I want to be in the same activity but data should be different.How should I do that need your help guys.

You should try doing it by urself in one of the many ways its possible to. Then we could provide some help with your idea or show you better solution. I think you are looking for RecyclerView (https://developer.android.com/guide/topics/ui/layout/recyclerview). It lets you show some similar views but with different data inside. Also as an item inside RecyclerView you can try CardView.
Using only RecyclerView you can also use:
https://stackoverflow.com/a/46084182/8713068
You can also search for a library that has everything you want inside already implemented. For example the first library that came out after i typed it in google : https://github.com/Ramotion/cardslider-android.

What kind of layout and java class should i use for a friend list layout?

I am learning android development and i am kinda stuck here. I want to create a friend list screen like shown in this picture.
What kind of activity should i use? Is there any available resources similar to what i want to achieve?
Thanks!

you can use ListActivity , also check out tutorials on lists, for example:
http://www.androidhive.info/2011/10/android-listview-tutorial/
http://www.vogella.com/tutorials/AndroidListView/article.html
you can find mire tutorials on google.
also you can use a regular Activity class with listView in the layout file

Use list view and custom adapter to populate the list view...
Listview should extend to the bottom but limit it just above the Type a name edit text and button.
Custom list view should contain linear layout horizontal in that include checkbox, Textview and Button
For type a name and Add use linear layout horizontal

Use listView with custom adapter , for array use arrayList<,friends,> sure you have to create friends class, in xml file put ListView then below that button and TextView

checkable spinner for android app

I am working on a mapView app and I would like to have a button much like the layer button in google maps that allows someone to show or hide an option from a spinner. I have searched to try and find how to accomplish this but have been unsuccessful. Can someone point me in the right direction of what to search for or what to implement?

you can just make a custom view that has bunch of checkboxes and textviews (stacked horizontally as a bunch of relativelayouts stacked in a linearlayout). this is probably easy enough to do if you don't have a ton of items. (I'm assuming you don't because you referred to the maps options)

iPhone has UITableView, what does android have

I have an app on the iPhone that is completely table view driven. On android all I see is a static table, how can I create a table that I can populate with data that I requested from the network.

You could use either ListView or GridView. ListView has a method getView which you override to customize ListView item. This very much like (UITableViewCell *)tableView... in iphone, except that you needn't count the height of each cell. If you want to have something like tableView with sections you could use ExpandableListView. Here are links to Android ListView, Android Expandable ListView and Android GridView. There can also be found very useful examples in Android Dev web-site.

You can use GridView or ListView with custom View for row. In both cases you can supply a BaseAdaper (or a subclass of it) through which you can manipulate the data.

If you want the exact grid border like example here you go Android Grid Border... Obviously you can render data dynamically from whatever the source is...