Te doy la bienvenida a nuestra web, ahora encontrarás la respuesta de lo que estabas buscando.
Solución:
Creo que estas buscando este metodo
LinearLayoutManager.setReverseLayout(true)
Y si no desea que sus artículos se apilen desde abajo, configure adicionalmente
setStackFromEnd(boolean) para false Para el LinearLayoutManager
Me estaba enfrentando a la misma preocupación desde los últimos días y esto es lo que se me ocurrió. Oyente de desplazamiento sin fin para ambas direcciones (superior / inferior).
Nota: No he probado esto para “GridLayoutManager”.
public abstract class EndlessRecyclerViewScrollListener extends RecyclerView.OnScrollListener
// Sets the starting page index
private static final int startingPageIndex = 0;
// The minimum amount of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 5;
// The current offset index of data you have loaded
private int currentPage = 0;
// The total number of items in the dataset after the last load
private int previousTotalItemCount = 0;
// True if we are still waiting for the last set of data to load.
private boolean loading = true;
private RecyclerView.LayoutManager mLayoutManager;
private LoadOnScrollDirection mDirection;
public EndlessRecyclerViewScrollListener(LinearLayoutManager layoutManager, LoadOnScrollDirection direction)
this.mLayoutManager = layoutManager;
mDirection = direction;
public EndlessRecyclerViewScrollListener(GridLayoutManager layoutManager, LoadOnScrollDirection direction)
this.mLayoutManager = layoutManager;
visibleThreshold = visibleThreshold * layoutManager.getSpanCount();
mDirection = direction;
public EndlessRecyclerViewScrollListener(StaggeredGridLayoutManager layoutManager, LoadOnScrollDirection direction)
this.mLayoutManager = layoutManager;
visibleThreshold = visibleThreshold * layoutManager.getSpanCount();
mDirection = direction;
// This happens many times a second during a scroll, so be wary of the code you place here.
// We are given a few useful parameters to help us work out if we need to load some more data,
// but first we check if we are waiting for the previous load to finish.
@Override
public void onScrolled(@NonNull RecyclerView view, int dx, int dy)
int lastVisibleItemPosition = 0;
int firstVisibleItemPosition = 0;
int totalItemCount = mLayoutManager.getItemCount();
if (mLayoutManager instanceof StaggeredGridLayoutManager)
int[] lastVisibleItemPositions =
((StaggeredGridLayoutManager) mLayoutManager).findLastVisibleItemPositions(null);
int[] firstVisibleItemPositions =
((StaggeredGridLayoutManager) mLayoutManager).findFirstVisibleItemPositions(null);
// get maximum element within the list
lastVisibleItemPosition = getLastVisibleItem(lastVisibleItemPositions);
firstVisibleItemPosition = getFirstVisibleItem(firstVisibleItemPositions);
else if (mLayoutManager instanceof LinearLayoutManager)
lastVisibleItemPosition =
((LinearLayoutManager) mLayoutManager).findLastVisibleItemPosition();
firstVisibleItemPosition =
((LinearLayoutManager) mLayoutManager).findFirstVisibleItemPosition();
else if (mLayoutManager instanceof GridLayoutManager)
lastVisibleItemPosition = ((GridLayoutManager) mLayoutManager).findLastVisibleItemPosition();
firstVisibleItemPosition = ((GridLayoutManager) mLayoutManager).findFirstVisibleItemPosition();
switch (mDirection)
case BOTTOM:
// If the total item count is zero and the previous isn't, assume the
// list is invalidated and should be reset back to initial state
if (totalItemCount < previousTotalItemCount)
this.currentPage = startingPageIndex;
this.previousTotalItemCount = totalItemCount;
if (totalItemCount == 0)
this.loading = true;
// If it’s still loading, we check to see if the dataset count has
// changed, if so we conclude it has finished loading and update the current page
// number and total item count.
if (loading && (totalItemCount > previousTotalItemCount))
loading = false;
previousTotalItemCount = totalItemCount;
// If it isn’t currently loading, we check to see if we have breached
// the visibleThreshold and need to reload more data.
// If we do need to reload some more data, we execute onLoadMore to fetch the data.
// threshold should reflect how many total columns there are too
if (!loading && (lastVisibleItemPosition + visibleThreshold) > totalItemCount)
currentPage++;
onLoadMore(currentPage, totalItemCount);
loading = true;
break;
case TOP:
// If the total item count is zero and the previous isn't, assume the
// list is invalidated and should be reset back to initial state
if (totalItemCount < previousTotalItemCount)
this.currentPage = startingPageIndex;
this.previousTotalItemCount = totalItemCount;
if (totalItemCount == 0)
this.loading = true;
// If it’s still loading, we check to see if the dataset count has
// changed, if so we conclude it has finished loading and update the current page
// number and total item count.
if (loading && (totalItemCount > previousTotalItemCount))
loading = false;
previousTotalItemCount = totalItemCount;
// If it isn’t currently loading, we check to see if we have breached
// the visibleThreshold and need to reload more data.
// If we do need to reload some more data, we execute onLoadMore to fetch the data.
// threshold should reflect how many total columns there are too
if (!loading && firstVisibleItemPosition < visibleThreshold)
currentPage++;
onLoadMore(currentPage, totalItemCount);
loading = true;
break;
private int getLastVisibleItem(int[] lastVisibleItemPositions)
int maxSize = 0;
for (int i = 0; i < lastVisibleItemPositions.length; i++)
if (i == 0)
maxSize = lastVisibleItemPositions[i];
else if (lastVisibleItemPositions[i] > maxSize)
maxSize = lastVisibleItemPositions[i];
return maxSize;
private int getFirstVisibleItem(int[] firstVisibleItemPositions)
int maxSize = 0;
for (int i = 0; i < firstVisibleItemPositions.length; i++)
if (i == 0)
maxSize = firstVisibleItemPositions[i];
else if (firstVisibleItemPositions[i] > maxSize)
maxSize = firstVisibleItemPositions[i];
return maxSize;
// Defines the process for actually loading more data based on page
public abstract void onLoadMore(int page, int totalItemsCount);
public enum LoadOnScrollDirection
TOP, BOTTOM
Implementación
LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
layoutManager.setStackFromEnd(true);
mBinding.rvChats.setLayoutManager(layoutManager);
mBinding.rvChats.addOnScrollListener(new EndlessRecyclerViewScrollListener(layoutManager, EndlessRecyclerViewScrollListener.LoadOnScrollDirection.TOP)
@Override
public void onLoadMore(int page, int totalItemsCount)
mViewModel.fetchMessages(page);
);
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