For this advanced challenge, you will create two types of rows in your RecyclerView: a normal row and a row for more serious crimes. To implement this, you will work with the view type feature available in RecyclerView.Adapter. Add a new property, mRequiresPolice, to the Crime object and use it to determine which view to load on the CrimeAdapter by implementing the getItemViewType(int) method (developer.android.com/​reference/​android/​support/​v7/​widget/​RecyclerView.Adapter.xhtml#getItemViewType(int)).

In the onCreateViewHolder(ViewGroup, int) method, you will also need to add logic that returns a different ViewHolder based on the new viewType value returned by getItemViewType(int). Use the original layout for crimes that do not require police intervention and a new layout with a streamlined interface containing a button that says “contact police” for crimes that do.