Наконец понял это с некоторой помощью от других кодов:
public class FlingRecyclerView extends RecyclerView {
int screenWidth;
public FlingRecyclerView(Context context) {
super(context);
WindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
}
public FlingRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
WindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
}
public FlingRecyclerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
WindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
screenWidth = size.x;
}
@Override
public boolean fling(int velocityX, int velocityY) {
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) getLayoutManager();
//these four variables identify the views you see on screen.
int lastVisibleView = linearLayoutManager.findLastVisibleItemPosition();
int firstVisibleView = linearLayoutManager.findFirstVisibleItemPosition();
View firstView = linearLayoutManager.findViewByPosition(firstVisibleView);
View lastView = linearLayoutManager.findViewByPosition(lastVisibleView);
//these variables get the distance you need to scroll in order to center your views.
//my views have variable sizes, so I need to calculate side margins separately.
//note the subtle difference in how right and left margins are calculated, as well as
//the resulting scroll distances.
int leftMargin = (screenWidth - lastView.getWidth())/2;
int rightMargin = (screenWidth - firstView.getWidth())/2 + firstView.getWidth();
int leftEdge = lastView.getLeft();
int rightEdge = firstView.getRight();
int scrollDistanceLeft = leftEdge - leftMargin;
int scrollDistanceRight = rightMargin - rightEdge;
//if(user swipes to the left)
if (velocityX > 0) smoothScrollBy(scrollDistanceLeft, 0);
else smoothScrollBy(-scrollDistanceRight, 0);
return true;
}
}
Работы удивительным для моих требований. Надеюсь, это тоже поможет кому-то другому.