public void onBindViewHolder(RecyclerView.ViewHolder vh, int position) {
        boolean checked = isItemChecked(position);
        if (vh.itemView instanceof Checkable) {
            ((Checkable) vh.itemView).setChecked(checked);
        }
        ViewCompat.setActivated(vh.itemView, checked);
    }
Returns the checked state of the specified position. The result is only
valid if the choice mode has been set to AbsListView.CHOICE_MODE_SINGLE,
but the code does not check this.

@param position The item whose checked state to return
@return The item's checked state
@see #setChoiceMode(int)
app/src/main/java/com/example/android/sunshine/app/ItemChoiceManager.java