Create dynamic lists with RecyclerView

• RecyclerViewdisplay set of data.
• i provide data and tell it to show n number of items, e.g. want only 5 to show.
• • RecyclerView resue view.

Key classes

to build dynamic list, i need following classes:

1. RecyclerView : it contains data, and i can only add it to screen.
2. for each element in layout element holder will be created, and RecyclerView bind it to it’s data RecyclerView.ViewHolder.
3. RecyclerView bind views to data by calling RecyclerView.Adapter method.
4. layout manager arranges the individual elements in list.

Steps for implementing your RecyclerView

• Design how each element in the list is going to look and behave.
• define Adapter to associates data with the ViewHolder.

Plan your layout

• items in RecyclerView are arranged by a LayoutManager class.
• RecyclerView library provides three layout managers:
  1. LinearLayoutManager. arrange items in one dimentional list.
  2. GridLayoutManager. arrange items in two dimentional view which is grid view.
  3. StaggeredGridLayoutManager similar to grid but the different is that my items don’t have to have the same height or width.

Implementing adapter and view holder

Adapter and ViewHolder work together to define how data is displayed - The ViewHolder is a wrapper around a View that contains the layout for an individual item in the list. - The Adapter creates ViewHolder objects as needed, and also sets the data for those views. - The process of associating views to their data is called binding.

• I need three methods to define adapter:
  • onCreateViewHolder()
  • onBindViewHolder()
  • getItemCount()