In this exercise you must make an Android application which consumes a REST resource http://hmkcode.appspot.com/rest/controller/get.json
The REST resourse returns a JSON string. You must parse this JSON string.
In the application you must use a ListView to display the data.
Make an ordinar class (not Activity) Article.
Call the REST resource from a browser or from Postman to see which properties the Article class needs (and the type of the properties).
Show a list of items (in this case articles: titles only). Use ListView or ListActivity + an ArrayAdapter.
When the user clicks (OnItemClickListener) an item the applications shows the details on this item.
In the Detail activity: When the users clicks the URL you must open a browser to show the content of the URL.
Making an Intent to open a browser
An Article has a number of categories and a number of tags. Show theres as two Spinners (or another kind of List). You probably need an ArrayAdapter.