public void selectView(RecyclerView.ViewHolder viewHolder) {
        if ( viewHolder instanceof ForecastAdapterViewHolder ) {
            ForecastAdapterViewHolder vfh = (ForecastAdapterViewHolder)viewHolder;
            vfh.onClick(vfh.itemView);
        }
    }
Cache of the children views for a forecast list item.
app/src/main/java/com/example/android/sunshine/app/ForecastAdapter.java