in ui/espresso/RecyclerViewSample/app/src/main/java/com/example/android/testing/espresso/RecyclerViewSample/CustomAdapter.java [85:93]
public void onBindViewHolder(ViewHolder viewHolder, final int position) {
if (position == mDataSet.size() / 2 /* calculate middle element position */) {
viewHolder.setIsInTheMiddle(true);
viewHolder.getTextView().setText(mContext.getResources().getString(R.string.middle));
} else {
viewHolder.setIsInTheMiddle(false);
viewHolder.getTextView().setText(mDataSet.get(position));
}
}