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Recycler View - Show only minimum elements and expand recycler view if user clicks expand [duplicate]

I would like to change ListView to RecyclerView. I want to use the onScroll of the OnScrollListener in RecyclerView to determine if a user scrolled to the end of the list.
How do I know if a user scrolls to the end of the list so that I can fetch new data from a REST service?

Thanks to #Kushal and this is how I implemented it
private boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (dy > 0) { //check for scroll down
visibleItemCount = mLayoutManager.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loading = false;
Log.v("...", "Last Item Wow !");
// Do pagination.. i.e. fetch new data
loading = true;
}
}
}
}
});
Don't forget to add
LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);

Make these variables.
private int previousTotal = 0;
private boolean loading = true;
private int visibleThreshold = 5;
int firstVisibleItem, visibleItemCount, totalItemCount;
Set on Scroll for recycler view.
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = mRecyclerView.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading && (totalItemCount - visibleItemCount)
<= (firstVisibleItem + visibleThreshold)) {
// End has been reached
Log.i("Yaeye!", "end called");
// Do something
loading = true;
}
}
});
Note : Make sure you are using LinearLayoutManager as layout manager for RecyclerView.
LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
and for a grid
GridLayoutManager mLayoutManager;
mLayoutManager = new GridLayoutManager(getActivity(), spanCount);
mRecyclerView.setLayoutManager(mLayoutManager);
Have fun with your endless scrolls !! ^.^
Update : mRecyclerView.setOnScrollListener() is deprecated just replace with mRecyclerView.addOnScrollListener() and the warning will be gone! You can read more from this SO question.
Since Android now officially support Kotlin, here is an update for the same -
Make OnScrollListener
class OnScrollListener(val layoutManager: LinearLayoutManager, val adapter: RecyclerView.Adapter<RecyclerAdapter.ViewHolder>, val dataList: MutableList<Int>) : RecyclerView.OnScrollListener() {
var previousTotal = 0
var loading = true
val visibleThreshold = 10
var firstVisibleItem = 0
var visibleItemCount = 0
var totalItemCount = 0
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
visibleItemCount = recyclerView.childCount
totalItemCount = layoutManager.itemCount
firstVisibleItem = layoutManager.findFirstVisibleItemPosition()
if (loading) {
if (totalItemCount > previousTotal) {
loading = false
previousTotal = totalItemCount
}
}
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
val initialSize = dataList.size
updateDataList(dataList)
val updatedSize = dataList.size
recyclerView.post { adapter.notifyItemRangeInserted(initialSize, updatedSize) }
loading = true
}
}
}
and add it to your RecyclerView like this
recyclerView.addOnScrollListener(OnScrollListener(layoutManager, adapter, dataList))
For a full code example, feel free to refer this Github repo.

For those who only want to get notified when the last item is totally shown, you can use View.canScrollVertically().
Here is my implementation:
public abstract class OnVerticalScrollListener
extends RecyclerView.OnScrollListener {
#Override
public final void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (!recyclerView.canScrollVertically(-1)) {
onScrolledToTop();
} else if (!recyclerView.canScrollVertically(1)) {
onScrolledToBottom();
} else if (dy < 0) {
onScrolledUp();
} else if (dy > 0) {
onScrolledDown();
}
}
public void onScrolledUp() {}
public void onScrolledDown() {}
public void onScrolledToTop() {}
public void onScrolledToBottom() {}
}
Note: You can use recyclerView.getLayoutManager().canScrollVertically() if you want to support API < 14.

Here is another approach. It will work with any layout manager.
Make Adapter class abstract
Then create an abstract method in adapter class (eg. load())
In onBindViewHolder check the position if last and call load()
Override the load() function while creating the adapter object in your activity or fragment.
In the overided load function implement your loadmore call
For a detail understanding I wrote a blog post and example project get it here
http://sab99r.com/blog/recyclerview-endless-load-more/
MyAdapter.java
public abstract class MyAdapter extends RecyclerView.Adapter<ViewHolder>{
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
//check for last item
if ((position >= getItemCount() - 1))
load();
}
public abstract void load();
}
MyActivity.java
public class MainActivity extends AppCompatActivity {
List<Items> items;
MyAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
...
adapter=new MyAdapter(items){
#Override
public void load() {
//implement your load more here
Item lastItem=items.get(items.size()-1);
loadMore();
}
};
}
}

My answer is a modified version of Noor. I passed from a ListView where i had EndlessScrollListener (that you can find easily in many answers on SO) to a RecyclerView so i wanted a EndlessRecyclScrollListener to easily update my past listener.
So here is the code, hope it helps:
public abstract class EndlessScrollRecyclListener extends RecyclerView.OnScrollListener
{
// The total number of items in the dataset after the last load
private int previousTotalItemCount = 0;
private boolean loading = true;
private int visibleThreshold = 5;
int firstVisibleItem, visibleItemCount, totalItemCount;
private int startingPageIndex = 0;
private int currentPage = 0;
#Override
public void onScrolled(RecyclerView mRecyclerView, int dx, int dy)
{
super.onScrolled(mRecyclerView, dx, dy);
LinearLayoutManager mLayoutManager = (LinearLayoutManager) mRecyclerView
.getLayoutManager();
visibleItemCount = mRecyclerView.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
onScroll(firstVisibleItem, visibleItemCount, totalItemCount);
}
public void onScroll(int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
// 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 = this.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;
currentPage++;
}
// 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.
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem +
visibleThreshold))
{
onLoadMore(currentPage + 1, totalItemCount);
loading = true;
}
}
// Defines the process for actually loading more data based on page
public abstract void onLoadMore(int page, int totalItemsCount);
}

For me, it's very simple:
private boolean mLoading = false;
mList.setOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int totalItem = mLinearLayoutManager.getItemCount();
int lastVisibleItem = mLinearLayoutManager.findLastVisibleItemPosition();
if (!mLoading && lastVisibleItem == totalItem - 1) {
mLoading = true;
// Scrolled to bottom. Do something here.
mLoading = false;
}
}
});
Be careful with asynchronous jobs: mLoading must be changed at the end of the asynchronous jobs. Hope it will be helpful!

With the power of Kotlin's extension functions, the code can look a lot more elegant. Put this anywhere you want (I have it inside an ExtensionFunctions.kt file):
/**
* WARNING: This assumes the layout manager is a LinearLayoutManager
*/
fun RecyclerView.addOnScrolledToEnd(onScrolledToEnd: () -> Unit){
this.addOnScrollListener(object: RecyclerView.OnScrollListener(){
private val VISIBLE_THRESHOLD = 5
private var loading = true
private var previousTotal = 0
override fun onScrollStateChanged(recyclerView: RecyclerView,
newState: Int) {
with(layoutManager as LinearLayoutManager){
val visibleItemCount = childCount
val totalItemCount = itemCount
val firstVisibleItem = findFirstVisibleItemPosition()
if (loading && totalItemCount > previousTotal){
loading = false
previousTotal = totalItemCount
}
if(!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)){
onScrolledToEnd()
loading = true
}
}
}
})
}
And then use it like this:
youRecyclerView.addOnScrolledToEnd {
//What you want to do once the end is reached
}
This solution is based on Kushal Sharma's answer. However, this is a bit better because:
It uses onScrollStateChanged instead of onScroll. This is better because onScroll is called every time there is any sort of movement in the RecyclerView, whereas onScrollStateChanged is only called when the state of the RecyclerView is changed. Using onScrollStateChanged will save you CPU time and, as a consequence, battery.
Since this uses Extension Functions, this can be used in any RecyclerView you have. The client code is just 1 line.

Most answer are assuming the RecyclerView uses a LinearLayoutManager, or GridLayoutManager, or even StaggeredGridLayoutManager, or assuming that the scrolling is vertical or horyzontal, but no one has posted a completly generic answer.
Using the ViewHolder's adapter is clearly not a good solution. An adapter might have more than 1 RecyclerView using it. It "adapts" their contents. It should be the RecyclerView (which is the one class which is responsible of what is currently displayed to the user, and not the adapter which is responsible only to provide content to the RecyclerView) which must notify your system that more items are needed (to load).
Here is my solution, using nothing else than the abstracted classes of the RecyclerView (RecycerView.LayoutManager and RecycerView.Adapter):
/**
* Listener to callback when the last item of the adpater is visible to the user.
* It should then be the time to load more items.
**/
public abstract class LastItemListener extends RecyclerView.OnScrollListener {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// init
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
RecyclerView.Adapter adapter = recyclerView.getAdapter();
if (layoutManager.getChildCount() > 0) {
// Calculations..
int indexOfLastItemViewVisible = layoutManager.getChildCount() -1;
View lastItemViewVisible = layoutManager.getChildAt(indexOfLastItemViewVisible);
int adapterPosition = layoutManager.getPosition(lastItemViewVisible);
boolean isLastItemVisible = (adapterPosition == adapter.getItemCount() -1);
// check
if (isLastItemVisible)
onLastItemVisible(); // callback
}
}
/**
* Here you should load more items because user is seeing the last item of the list.
* Advice: you should add a bollean value to the class
* so that the method {#link #onLastItemVisible()} will be triggered only once
* and not every time the user touch the screen ;)
**/
public abstract void onLastItemVisible();
}
// --- Exemple of use ---
myRecyclerView.setOnScrollListener(new LastItemListener() {
public void onLastItemVisible() {
// start to load more items here.
}
}

Although the accepted answer works perfectly, the solution below uses addOnScrollListener since setOnScrollListener is deprecated, and reduces number of variables, and if conditions.
final LinearLayoutManager layoutManager = new LinearLayoutManager(context);
feedsRecyclerView.setLayoutManager(layoutManager);
feedsRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) {
if ((layoutManager.getChildCount() + layoutManager.findFirstVisibleItemPosition()) >= layoutManager.getItemCount()) {
Log.d("TAG", "End of list");
//loadMore();
}
}
}
});

This is how I do it, simple and short:
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener()
{
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy)
{
if(!recyclerView.canScrollVertically(1) && dy != 0)
{
// Load more results here
}
}
});

Although there are so many answers to the question, I would like to share our experience of creating the endless list view. We have recently implemented custom Carousel LayoutManager that can work in the cycle by scrolling the list infinitely as well as up to a certain point. Here is a detailed description on GitHub.
I suggest you take a look at this article with short but valuable recommendations on creating custom LayoutManagers: http://cases.azoft.com/create-custom-layoutmanager-android/

OK, I did it by using the onBindViewHolder method of RecyclerView.Adapter.
Adapter:
public interface OnViewHolderListener {
void onRequestedLastItem();
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
...
if (position == getItemCount() - 1) onViewHolderListener.onRequestedLastItem();
}
Fragment (or Activity):
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
contentView = inflater.inflate(R.layout.comments_list, container, false);
recyclerView = (RecyclerView) mContentView.findViewById(R.id.my_recycler_view);
adapter = new Adapter();
recyclerView.setAdapter(adapter);
...
adapter.setOnViewHolderListener(new Adapter.OnViewHolderListener() {
#Override
public void onRequestedLastItem() {
//TODO fetch new data from webservice
}
});
return contentView;
}

recyclerList.setOnScrollListener(new RecyclerView.OnScrollListener()
{
#Override
public void onScrolled(RecyclerView recyclerView, int dx,int dy)
{
super.onScrolled(recyclerView, dx, dy);
}
#Override
public void onScrollStateChanged(RecyclerView recyclerView,int newState)
{
int totalItemCount = layoutManager.getItemCount();
int lastVisibleItem = layoutManager.findLastVisibleItemPosition();
if (totalItemCount> 1)
{
if (lastVisibleItem >= totalItemCount - 1)
{
// End has been reached
// do something
}
}
}
});

I would try to extend used LayoutManager (e.g. LinearLayoutManager) and override scrollVerticallyBy() method. Firstly, I would call super first and then check returned integer value. If the value equals to 0 then a bottom or a top border is reached. Then I would use findLastVisibleItemPosition() method to find out which border is reached and load more data if needed. Just an idea.
In addition, you can even return your value from that method allowing overscroll and showing "loading" indicator.

I achieved an infinite scrolling type implementation using this logic in the onBindViewHolder method of my RecyclerView.Adapter class.
if (position == mItems.size() - 1 && mCurrentPage <= mTotalPageCount) {
if (mCurrentPage == mTotalPageCount) {
mLoadImagesListener.noMorePages();
} else {
int newPage = mCurrentPage + 1;
mLoadImagesListener.loadPage(newPage);
}
}
With this code when the RecyclerView gets to the last item, it increments the current page and callbacks on an interface which is responsible for loading more data from the api and adding the new results to the adapter.
I can post more complete example if this isn't clear?

For people who use StaggeredGridLayoutManager here is my implementation, it works for me.
private class ScrollListener extends RecyclerView.OnScrollListener {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
firstVivisibleItems = mLayoutManager.findFirstVisibleItemPositions(firstVivisibleItems);
if(!recyclerView.canScrollVertically(1) && firstVivisibleItems[0]!=0) {
loadMoreImages();
}
}
private boolean loadMoreImages(){
Log.d("myTag", "LAST-------HERE------");
return true;
}
}

There is an easy to use library for this named paginate . Supports both ListView and RecyclerView ( LinearLayout , GridLayout and StaggeredGridLayout).
Here is the link to the project on Github

My way to detect loading event is not to detect scrolling, but to listen whether the last view was attached. If the last view was attached, I regard it as timing to load more content.
class MyListener implements RecyclerView.OnChildAttachStateChangeListener {
RecyclerView mRecyclerView;
MyListener(RecyclerView view) {
mRecyclerView = view;
}
#Override
public void onChildViewAttachedToWindow(View view) {
RecyclerView.Adapter adapter = mRecyclerView.getAdapter();
RecyclerView.LayoutManager mgr = mRecyclerView.getLayoutManager();
int adapterPosition = mgr.getPosition(view);
if (adapterPosition == adapter.getItemCount() - 1) {
// last view was attached
loadMoreContent();
}
#Override
public void onChildViewDetachedFromWindow(View view) {}
}

Create an abstract class and extends RecyclerView.OnScrollListener
public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener {
private int previousTotal = 0;
private boolean loading = true;
private int visibleThreshold;
private int firstVisibleItem, visibleItemCount, totalItemCount;
private RecyclerView.LayoutManager layoutManager;
public EndlessRecyclerOnScrollListener(RecyclerView.LayoutManager layoutManager, int visibleThreshold) {
this.layoutManager = layoutManager; this.visibleThreshold = visibleThreshold;
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = recyclerView.getChildCount();
totalItemCount = layoutManager.getItemCount();
firstVisibleItem = ((LinearLayoutManager)layoutManager).findFirstVisibleItemPosition();
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
onLoadMore();
loading = true;
}
}
public abstract void onLoadMore();}
in activity (or fragment) add addOnScrollListener to recyclerView
LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(mLayoutManager, 3) {
#Override
public void onLoadMore() {
//TODO
...
}
});

I have a pretty detailed example of how to paginate with a RecyclerView. At a high level, I have a set PAGE_SIZE , lets say 30. So I request 30 items and if I get 30 back then I request the next page. If I get less than 30 items I flag a variable to indicate that the last page has been reached and then I stop requesting for more pages. Check it out and let me know what you think.
https://medium.com/#etiennelawlor/pagination-with-recyclerview-1cb7e66a502b

Here my solution using AsyncListUtil, in the web says:
Note that this class uses a single thread to load the data, so it suitable to load data from secondary storage such as disk, but not from network.
but i am using odata to read the data and work fine.
I miss in my example data entities and network methods.
I include only the example adapter.
public class AsyncPlatoAdapter extends RecyclerView.Adapter {
private final AsyncPlatoListUtil mAsyncListUtil;
private final MainActivity mActivity;
private final RecyclerView mRecyclerView;
private final String mFilter;
private final String mOrderby;
private final String mExpand;
public AsyncPlatoAdapter(String filter, String orderby, String expand, RecyclerView recyclerView, MainActivity activity) {
mFilter = filter;
mOrderby = orderby;
mExpand = expand;
mRecyclerView = recyclerView;
mActivity = activity;
mAsyncListUtil = new AsyncPlatoListUtil();
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).
inflate(R.layout.plato_cardview, parent, false);
// Create a ViewHolder to find and hold these view references, and
// register OnClick with the view holder:
return new PlatoViewHolderAsync(itemView, this);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final Plato item = mAsyncListUtil.getItem(position);
PlatoViewHolderAsync vh = (PlatoViewHolderAsync) holder;
if (item != null) {
Integer imagen_id = item.Imagen_Id.get();
vh.getBinding().setVariable(BR.plato, item);
vh.getBinding().executePendingBindings();
vh.getImage().setVisibility(View.VISIBLE);
vh.getProgress().setVisibility(View.GONE);
String cacheName = null;
String urlString = null;
if (imagen_id != null) {
cacheName = String.format("imagenes/imagen/%d", imagen_id);
urlString = String.format("%s/menusapi/%s", MainActivity.ROOTPATH, cacheName);
}
ImageHelper.downloadBitmap(mActivity, vh.getImage(), vh.getProgress(), urlString, cacheName, position);
} else {
vh.getBinding().setVariable(BR.plato, item);
vh.getBinding().executePendingBindings();
//show progress while loading.
vh.getImage().setVisibility(View.GONE);
vh.getProgress().setVisibility(View.VISIBLE);
}
}
#Override
public int getItemCount() {
return mAsyncListUtil.getItemCount();
}
public class AsyncPlatoListUtil extends AsyncListUtil<Plato> {
/**
* Creates an AsyncListUtil.
*/
public AsyncPlatoListUtil() {
super(Plato.class, //my data class
10, //page size
new DataCallback<Plato>() {
#Override
public int refreshData() {
//get count calling ../$count ... odata endpoint
return countPlatos(mFilter, mOrderby, mExpand, mActivity);
}
#Override
public void fillData(Plato[] data, int startPosition, int itemCount) {
//get items from odata endpoint using $skip and $top
Platos p = loadPlatos(mFilter, mOrderby, mExpand, startPosition, itemCount, mActivity);
for (int i = 0; i < Math.min(itemCount, p.value.size()); i++) {
data[i] = p.value.get(i);
}
}
}, new ViewCallback() {
#Override
public void getItemRangeInto(int[] outRange) {
//i use LinearLayoutManager in the RecyclerView
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
outRange[0] = layoutManager.findFirstVisibleItemPosition();
outRange[1] = layoutManager.findLastVisibleItemPosition();
}
#Override
public void onDataRefresh() {
mRecyclerView.getAdapter().notifyDataSetChanged();
}
#Override
public void onItemLoaded(int position) {
mRecyclerView.getAdapter().notifyItemChanged(position);
}
});
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
onRangeChanged();
}
});
}
}
}

if (layoutManager.findLastCompletelyVisibleItemPosition() ==
recyclerAdapter.getItemCount() - 1) {
//load more items.
}
Fair and simple.
This will work.

As #John T suggest. Just use code block below, really short, beauty and simple :D
public void loadMoreOnRecyclerView() {
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(#NonNull #NotNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (!recyclerView.canScrollVertically(1) && dy != 0) {
//Load more items here
}
}
});
}
You can follow my Repo to understand the way that it work.
https://github.com/Nghien-Nghien/PokeAPI-Java/blob/0d8d69d348e068911b883f0ae7791d904cc75cb5/app/src/main/java/com/example/pokemonapi/MainActivity.java
Description info about app like this: https://github.com/skydoves/Pokedex#readme

There is a method public void setOnScrollListener (RecyclerView.OnScrollListener listener) in https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html#setOnScrollListener%28android.support.v7.widget.RecyclerView.OnScrollListener%29. Use that
EDIT:
Override onScrollStateChanged method inside the onScrollListener and do this
boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount;
//loading is used to see if its already loading, you have to manually manipulate this boolean variable
if (loadMore && !loading) {
//end of list reached
}

Check this every thing is explained in detail:
Pagination using RecyclerView From A to Z
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrollStateChanged(RecyclerView recyclerView,
int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int visibleItemCount = mLayoutManager.getChildCount();
int totalItemCount = mLayoutManager.getItemCount();
int firstVisibleItemPosition = mLayoutManager.findFirstVisibleItemPosition();
if (!mIsLoading && !mIsLastPage) {
if ((visibleItemCount + firstVisibleItemPosition) >= totalItemCount
&& firstVisibleItemPosition >= 0) {
loadMoreItems();
}
}
}
})
loadMoreItems():
private void loadMoreItems() {
mAdapter.removeLoading();
//load data here from the server
// in case of success
mAdapter.addData(data);
// if there might be more data
mAdapter.addLoading();
}
in MyAdapter :
private boolean mIsLoadingFooterAdded = false;
public void addLoading() {
if (!mIsLoadingFooterAdded) {
mIsLoadingFooterAdded = true;
mLineItemList.add(new LineItem());
notifyItemInserted(mLineItemList.size() - 1);
}
}
public void removeLoading() {
if (mIsLoadingFooterAdded) {
mIsLoadingFooterAdded = false;
int position = mLineItemList.size() - 1;
LineItem item = mLineItemList.get(position);
if (item != null) {
mLineItemList.remove(position);
notifyItemRemoved(position);
}
}
}
public void addData(List<YourDataClass> data) {
for (int i = 0; i < data.size(); i++) {
YourDataClass yourDataObject = data.get(i);
mLineItemList.add(new LineItem(yourDataObject));
notifyItemInserted(mLineItemList.size() - 1);
}
}

None of these answers take into account if the list is too small or not.
Here's a piece of code I've been using that works on RecycleViews in both directions.
#Override
public boolean onTouchEvent(MotionEvent motionEvent) {
if (recyclerViewListener == null) {
return super.onTouchEvent(motionEvent);
}
/**
* If the list is too small to scroll.
*/
if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
if (!canScrollVertically(1)) {
recyclerViewListener.reachedBottom();
} else if (!canScrollVertically(-1)) {
recyclerViewListener.reachedTop();
}
}
return super.onTouchEvent(motionEvent);
}
public void setListener(RecyclerViewListener recycleViewListener) {
this.recyclerViewListener = recycleViewListener;
addOnScrollListener(new OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (recyclerViewListener == null) {
return;
}
recyclerViewListener.scrolling(dy);
if (!canScrollVertically(1)) {
recyclerViewListener.reachedBottom();
} else if (!canScrollVertically(-1)) {
recyclerViewListener.reachedTop();
}
}
});
}

I let you my aproximation. Works fine for me.
I hope it helps you.
/**
* Created by Daniel Pardo Ligorred on 03/03/2016.
*/
public abstract class BaseScrollListener extends RecyclerView.OnScrollListener {
protected RecyclerView.LayoutManager layoutManager;
public BaseScrollListener(RecyclerView.LayoutManager layoutManager) {
this.layoutManager = layoutManager;
this.init();
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
this.onScroll(recyclerView, this.getFirstVisibleItem(), this.layoutManager.getChildCount(), this.layoutManager.getItemCount(), dx, dy);
}
private int getFirstVisibleItem(){
if(this.layoutManager instanceof LinearLayoutManager){
return ((LinearLayoutManager) this.layoutManager).findFirstVisibleItemPosition();
} else if (this.layoutManager instanceof StaggeredGridLayoutManager){
int[] spanPositions = null; //Should be null -> StaggeredGridLayoutManager.findFirstVisibleItemPositions makes the work.
try{
return ((StaggeredGridLayoutManager) this.layoutManager).findFirstVisibleItemPositions(spanPositions)[0];
}catch (Exception ex){
// Do stuff...
}
}
return 0;
}
public abstract void init();
protected abstract void onScroll(RecyclerView recyclerView, int firstVisibleItem, int visibleItemCount, int totalItemCount, int dx, int dy);
}

#kushal #abdulaziz
Why not use this logic instead?
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
int totalItemCount, lastVisibleItemPosition;
if (dy > 0) {
totalItemCount = _layoutManager.getItemCount();
lastVisibleItemPosition = _layoutManager.findLastVisibleItemPosition();
if (!_isLastItem) {
if ((totalItemCount - 1) == lastVisibleItemPosition) {
LogUtil.e("end_of_list");
_isLastItem = true;
}
}
}
}

Try below:
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.LayoutManager;
/**
* Abstract Endless ScrollListener
*
*/
public abstract class EndlessScrollListener extends
RecyclerView.OnScrollListener {
// The minimum amount of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 10;
// The current offset index of data you have loaded
private int currentPage = 1;
// True if we are still waiting for the last set of data to load.
private boolean loading = true;
// The total number of items in the data set after the last load
private int previousTotal = 0;
private int firstVisibleItem;
private int visibleItemCount;
private int totalItemCount;
private LayoutManager layoutManager;
public EndlessScrollListener(LayoutManager layoutManager) {
validateLayoutManager(layoutManager);
this.layoutManager = layoutManager;
}
public EndlessScrollListener(int visibleThreshold,
LayoutManager layoutManager, int startPage) {
validateLayoutManager(layoutManager);
this.visibleThreshold = visibleThreshold;
this.layoutManager = layoutManager;
this.currentPage = startPage;
}
private void validateLayoutManager(LayoutManager layoutManager)
throws IllegalArgumentException {
if (null == layoutManager
|| !(layoutManager instanceof GridLayoutManager)
|| !(layoutManager instanceof LinearLayoutManager)) {
throw new IllegalArgumentException(
"LayoutManager must be of type GridLayoutManager or LinearLayoutManager.");
}
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = recyclerView.getChildCount();
totalItemCount = layoutManager.getItemCount();
if (layoutManager instanceof GridLayoutManager) {
firstVisibleItem = ((GridLayoutManager) layoutManager)
.findFirstVisibleItemPosition();
} else if (layoutManager instanceof LinearLayoutManager) {
firstVisibleItem = ((LinearLayoutManager) layoutManager)
.findFirstVisibleItemPosition();
}
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading
&& (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
// End has been reached do something
currentPage++;
onLoadMore(currentPage);
loading = true;
}
}
// Defines the process for actually loading more data based on page
public abstract void onLoadMore(int page);
}

I have created LoadMoreRecyclerView using Abdulaziz Noor Answer
LoadMoreRecyclerView
public class LoadMoreRecyclerView extends RecyclerView {
private boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
//WrapperLinearLayout is for handling crash in RecyclerView
private WrapperLinearLayout mLayoutManager;
private Context mContext;
private OnLoadMoreListener onLoadMoreListener;
public LoadMoreRecyclerView(Context context) {
super(context);
mContext = context;
init();
}
public LoadMoreRecyclerView(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
mContext = context;
init();
}
public LoadMoreRecyclerView(Context context, #Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
init();
}
private void init(){
mLayoutManager = new WrapperLinearLayout(mContext,LinearLayoutManager.VERTICAL,false);
this.setLayoutManager(mLayoutManager);
this.setItemAnimator(new DefaultItemAnimator());
this.setHasFixedSize(true);
}
#Override
public void onScrolled(int dx, int dy) {
super.onScrolled(dx, dy);
if(dy > 0) //check for scroll down
{
visibleItemCount = mLayoutManager.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();
if (loading)
{
if ( (visibleItemCount + pastVisiblesItems) >= totalItemCount)
{
loading = false;
Log.v("...", "Call Load More !");
if(onLoadMoreListener != null){
onLoadMoreListener.onLoadMore();
}
//Do pagination.. i.e. fetch new data
}
}
}
}
#Override
public void onScrollStateChanged(int state) {
super.onScrollStateChanged(state);
}
public void onLoadMoreCompleted(){
loading = true;
}
public void setMoreLoading(boolean moreLoading){
loading = moreLoading;
}
public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
this.onLoadMoreListener = onLoadMoreListener;
}
}
WrapperLinearLayout
public class WrapperLinearLayout extends LinearLayoutManager
{
public WrapperLinearLayout(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
#Override
public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
try {
super.onLayoutChildren(recycler, state);
} catch (IndexOutOfBoundsException e) {
Log.e("probe", "meet a IOOBE in RecyclerView");
}
}
}
//Add it in xml like
<your.package.LoadMoreRecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
</your.package.LoadMoreRecyclerView>
OnCreate or onViewCreated
mLoadMoreRecyclerView = (LoadMoreRecyclerView) view.findViewById(R.id.recycler_view);
mLoadMoreRecyclerView.setOnLoadMoreListener(new OnLoadMoreListener() {
#Override
public void onLoadMore() {
callYourService(StartIndex);
}
});
callYourService
private void callYourService(){
//callyour Service and get response in any List
List<AnyModelClass> newDataFromServer = getDataFromServerService();
//Enable Load More
mLoadMoreRecyclerView.onLoadMoreCompleted();
if(newDataFromServer != null && newDataFromServer.size() > 0){
StartIndex += newDataFromServer.size();
if (newDataFromServer.size() < Integer.valueOf(MAX_ROWS)) {
//StopLoading..
mLoadMoreRecyclerView.setMoreLoading(false);
}
}
else{
mLoadMoreRecyclerView.setMoreLoading(false);
mAdapter.notifyDataSetChanged();
}
}

findLastVisibleItemPosition is returning wrong value if RecyclerView inside NestedScrollView

I have RecyclerView inside NestedScrollView
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.NestedScrollView>
I have this problem in big project and in order to find solution for this problem I have created new project without other views.
This is full code of MainActivity
class MainActivity : AppCompatActivity() {
var mItems = mutableListOf<String>()
var mAdapter = MyAdapter(mItems)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
recycler.layoutManager = LinearLayoutManager(this)
recycler.adapter = mAdapter
delayedLoadDataIfPossible(100)
recycler.viewTreeObserver.addOnScrollChangedListener {
delayedLoadDataIfPossible(100)
}
}
private fun delayedLoadDataIfPossible(delay: Long) {
Observable.timer(delay, TimeUnit.MILLISECONDS)
.observeOn(AndroidSchedulers.mainThread())
.subscribe {
var scrollingReachedEnd = isScrollingReachedEnd()
if (scrollingReachedEnd) {
loadData()
}
}
}
private fun isScrollingReachedEnd(): Boolean {
val layoutManager = LinearLayoutManager::class.java.cast(recycler.layoutManager)
val totalItemCount = layoutManager.itemCount
val lastVisible = layoutManager.findLastVisibleItemPosition()
return lastVisible + 5 >= totalItemCount
}
private fun loadData() {
Observable.timer(5, TimeUnit.SECONDS)
.observeOn(AndroidSchedulers.mainThread())
.doOnSubscribe { progress.visibility = View.VISIBLE }
.doFinally { progress.visibility = View.GONE }
.subscribe {
for (i in 1..10) {
mItems.add(i.toString())
}
mAdapter.notifyDataSetChanged()
delayedLoadDataIfPossible(100)
}
}
}
I am using isScrollingReachedEnd method to identify is scrolling reaching end of list. If there are less than 5 visible items in the end, I am trying to load new data.
loadData simulates loading data. It adds 10 items to list and notifies adapter about change.
delayedLoadDataIfPossible method should work after some delay because findLastVisibleItemPosition is returning value before items are added to list. In result it is returning wrong value. For example -1 after adding first 10 items.
My problem: when RecyclerView inside NestedScrollView findLastVisibleItemPosition returning wrong value and data loading can not be stopped even there are enough items. There is no such problem when RecyclerView not inside NestedScrollView.
My question: how to get last visible item position from RecyclerView when it is inside NestedScrollView?

the problem is when recyclerView parent is a scrollable ViewGroup like nestedScroll , all items in recyclerView is laid out even its not shown , so the
findLastVisibleItemPosition() will always return last item in array even if it not visible , so you have to use scroll listener of parent scrollView
package com.example.myApp;
import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.widget.NestedScrollView;
import androidx.recyclerview.widget.LinearLayoutManager;
public class MyNestedScroll extends NestedScrollView {
int SCREEN_HEIGHT ;
private IsBottomOfList isBottomOfList ;
private LinearLayoutManager linearLayoutManager ;
private String TAG = "MyNestedScroll";
public MyNestedScroll(#NonNull Context context) {
super(context);
init();
}
public MyNestedScroll(#NonNull Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public MyNestedScroll(#NonNull Context context, #Nullable AttributeSet attrs, int
defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init(){
SCREEN_HEIGHT = getContext().getResources().getDisplayMetrics().heightPixels;
}
#Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (isBottomOfList != null){
isBottomOfList.isBottomOfList(isVisible());
}
}
public boolean isVisible() {
View view = null;
int childCount ;
if (linearLayoutManager != null) {
childCount = linearLayoutManager.getChildCount();
view = linearLayoutManager.getChildAt(childCount-1);
}else {
Log.v(TAG , "linearLayoutManager == null");
}
if (view == null) {
Log.v(TAG , "view == null");
return false;
}
if (!view.isShown()) {
Log.v(TAG , "!view.isShown()");
return false;
}
Rect actualPosition = new Rect();
view.getGlobalVisibleRect(actualPosition);
int height1 = view.getHeight();
int height2 = actualPosition.bottom- actualPosition.top;
Log.v(TAG , "actualPosition.bottom = "+actualPosition.bottom+"/ HomePage.SCREEN_HEIGHT ="+
HomePage.SCREEN_HEIGHT+" / height1 = "+height1+"/ height2 = "+height2);
return actualPosition.bottom<SCREEN_HEIGHT&&height1==height2;
}
public void setIsBottomOfList(IsBottomOfList isBottomOfList) {
this.isBottomOfList = isBottomOfList;
}
public void setLinearLayoutManager(LinearLayoutManager linearLayoutManager) {
this.linearLayoutManager = linearLayoutManager;
Log.v(TAG , linearLayoutManager == null?"LM == NULL":"LM != NULL");
}
public interface IsBottomOfList {
void isBottomOfList(boolean isBottom);
}
}
and in your activity use only this lines
// call this function after set layoutmanager to your recyclerView
private void initScrollListener() {
nestedScroll.setLinearLayoutManager((LinearLayoutManager)bookingRecyclerView.getLayoutManager());
nestedScroll.setIsBottomOfList(isBottom -> {
if (isBottom){
// here the last item of recyclerView is reached
// do some stuff to load more data
}
});
}
It works fine for me , if not please let me know

You could try this approach:
Find RecyclerView inside NestedScrollingView with getChildAt() method.
Get LayoutManager from RecyclerView.
Find lastVisiblePosition().
This is my code for a ScrollingListener for a NestedScrollingView:
#Override
public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
int lastVisibleItemPosition = 0;
int totalItemCount = layoutManager.getItemCount();
if(v.getChildAt(v.getChildCount() - 1) != null) {
if (scrollY >= (v.getChildAt(v.getChildCount()-1).getMeasuredHeight() - v.getMeasuredHeight())
&& scrollY > oldScrollY) {
if (layoutManager instanceof LinearLayoutManager) {
lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
}
if (totalItemCount < previousTotalItemCount) {
this.currentPage = this.startingPageIndex;
this.previousTotalItemCount = totalItemCount;
if (totalItemCount == 0) {
this.loading = true;
}
}
if (loading && (totalItemCount > previousTotalItemCount)) {
loading = false;
previousTotalItemCount = totalItemCount;
}
if (!loading && (lastVisibleItemPosition + visibleThreshold) > totalItemCount) {
currentPage++;
onLoadMore();
loading = true;
}
}
}
}
Good luck!

Simple solution : Put the below scrollChangeListener on NestedScrollView and remove scrollListener from Recyclerview.
And put the Load more Pagination functionlity on onScrollChange under if condition mention below. That's it.
private void handleNestedScrollListener() {
mNestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
#Override
public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
if ((scrollY >= (v.getChildAt(v.getChildCount() - 1).getMeasuredHeight() - v.getMeasuredHeight())) &&
scrollY > oldScrollY) {
// Do Load more feature here
}
}
});
}
..Worked for me..

If your RecyclerView is inside a NestedScrollView, you need to add recyclerView.setNestedScrollingEnabled(false) to it.
Also another note (which is unrelated to your question is that you should definitely keep a reference to those RxJava subscriptions and dispose them on Fragment/Adtivity's onStop, since they can cause memory leak issues.

Android LinearSnapHelper - how to increase scrolling/"snapping" speed?

I'm using a LinearSnapHelper to make items in my RecyclerView "snap" into place on the screen (my cards take up most of the screen, so I want them to snap into place and fill the screen on every swipe/fling/scroll).
I'm struggling with how to make the cards snap into place faster. I've tried creating a custom LinearLayoutManager (and editing the calculateSpeedPerPixel method in scrollToPosition or smoothScrollToPosition), as well as a custom RecyclerView (and editing the fling method). But nothing effects the speed that cards "snap" into place.
I suppose the issue is that I don't really understand how LinearSnapHelper "scrolls" the cards into position. It doesn't seem to use LinearLayoutManager's scrollToPosition or smoothScrollToPosition methods.
snapHelper = new LinearSnapHelper() {
#Override
public int findTargetSnapPosition(RecyclerView.LayoutManager layoutManager, int velocityX, int velocityY) {
View centerView = findSnapView(layoutManager);
if (centerView == null) {
return RecyclerView.NO_POSITION;
}
int position = layoutManager.getPosition(centerView);
int targetPosition = -1;
if (layoutManager.canScrollHorizontally()) {
if (velocityX < 0) {
targetPosition = position - 1;
} else {
targetPosition = position + 1;
}
}
if (layoutManager.canScrollVertically()) {
if (velocityY > 0) {
targetPosition = position + 1;
} else {
targetPosition = position - 1;
}
}
final int firstItem = 0;
final int lastItem = layoutManager.getItemCount() - 1;
targetPosition = Math.min(lastItem, Math.max(targetPosition, firstItem));
return targetPosition;
}
};
snapHelper.attachToRecyclerView(mRecyclerView);

As 郭玉龙 mentioned, SnapHelper call RecyclerView.smoothScrollBy() method. And it use default sQuinticInterpolator.
To change speed of snap you can do next:
public class SlowdownRecyclerView extends RecyclerView {
// Change pow to control speed.
// Bigger = faster. RecyclerView default is 5.
private static final int POW = 2;
private Interpolator interpolator;
public SlowdownRecyclerView(Context context) {
super(context);
createInterpolator();
}
public SlowdownRecyclerView(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
createInterpolator();
}
public SlowdownRecyclerView(Context context, #Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
createInterpolator();
}
private void createInterpolator(){
interpolator = new Interpolator() {
#Override
public float getInterpolation(float t) {
t = Math.abs(t - 1.0f);
return (float) (1.0f - Math.pow(t, POW));
}
};
}
#Override
public void smoothScrollBy(int dx, int dy) {
super.smoothScrollBy(dx, dy, interpolator);
}
Or you can implement your own interpolator.

The speed of snapping scroll is affected by RecyclerView.smoothScrollBy().
Here's the snippet of source code.
Override this function to increase or decrease the speed of snapping scroll.

I wound up doing this by adding a ScrollListener to my RecycleView, and then creating a custom LinearLayoutManager and custom smoothScrollToPosition method.
final CustomLinearLayoutManager mLayoutManager = new CustomLinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
private boolean scrollingUp;
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
scrollingUp = dy < 0;
}
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
int visiblePosition = scrollingUp ? mLayoutManager.findFirstVisibleItemPosition() : mLayoutManager.findLastVisibleItemPosition();
int completelyVisiblePosition = scrollingUp ? mLayoutManager
.findFirstCompletelyVisibleItemPosition() : mLayoutManager
.findLastCompletelyVisibleItemPosition();
if (visiblePosition != completelyVisiblePosition) {
recyclerView.smoothScrollToPosition(visiblePosition);
return;
}
}
});

I achieved this using a library https://github.com/rubensousa/GravitySnapHelper
you can also override findTargetSnapPosition to get pager like scroll
tweek the scrollMsPerInch to increase / decrease speed
val snapHelper : GravitySnapHelper = GravitySnapHelper(Gravity.CENTER)
// the lower the higher the speed, default is 100f
snapHelper.scrollMsPerInch = 40f
snapHelper.attachToRecyclerView(binding?.mRecyclerView)

Actually you can modify the LinearSnapHelper and SnapHelperClass by simply copy/paste the existing code the only thing you will do is to set MILLISECONDS_PER_INCH on SnapHelper as you want and then use simply use the LinearSnapHelper you created

How to make endless recycler view

I've seen many questions here on SOF.. my problem is similar if not the same, am trying to make a recycler view keep on scrolling, the questions' answers said to use a method in the layout manager called:
findLastVisibleItemPosition()
But I can't seem to find that method in my layout manager. Here's my code:
premiumOffers = (RecyclerView) view.findViewById(R.id.premiumOffers);
layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
premiumOffers.setOnScrollListener(new OnScrollListener() {
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == 0) {
Log.v("pos ", recyclerView.getLayoutManager().getChildCount() + "");
if (recyclerView.getChildPosition(recyclerView.getFocusedChild()) == recyclerView.getAdapter().getItemCount() - 1) {
}
}
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// Log.v("OnScrolled", dx + " | " + dy);
}
});

Be sure to call the method on a LinearLayoutManager
LinearLayoutManager linearLayoutM = new LinearLayoutManager(getActivity());
firstItem = linearLayoutM.findFirstVisibleItemPosition();
Follow this guide to a perfect work:
EndlessRecyclerOnScrollListener

Please follow the step form
http://android-pratap.blogspot.in/2015/01/endless-recyclerview-onscrolllistener.html
and you will be able to implement what you want.

Here is an example of a recyclerView that will do what you want. Just implement the OnLastVisible callbacks that will get called on the last item visible.
import android.content.Context;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
/**
* Created by poliveira on 04/12/2014.
*/
public class CustomRecyclerView extends RecyclerView {
private int mLastVisibleItem;
private OnLastVisible mCallbacks;
private IScrollCallbacks mScrollCallbacks;
public CustomRecyclerView(Context context) {
super(context);
init();
}
public CustomRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CustomRecyclerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
setOnScrollListener(new OnScrollListener() {
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
if (newState == SCROLL_STATE_IDLE) {
if (mScrollCallbacks != null)
mScrollCallbacks.onIdleScroll();
} else if (mScrollCallbacks != null)
mScrollCallbacks.onScroll();
super.onScrollStateChanged(recyclerView, newState);
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
int lastVisible = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastVisibleItemPosition();
if (recyclerView.getAdapter().getItemCount() - 1 == lastVisible && lastVisible != mLastVisibleItem) {
mLastVisibleItem = lastVisible;
if (mCallbacks != null) {
mCallbacks.loadMore();
}
}
}
}
);
}
public OnLastVisible getCallbacks() {
return mCallbacks;
}
public void setCallbacks(OnLastVisible callbacks) {
mCallbacks = callbacks;
}
public IScrollCallbacks getScrollCallbacks() {
return mScrollCallbacks;
}
public void setScrollCallbacks(IScrollCallbacks scrollCallbacks) {
mScrollCallbacks = scrollCallbacks;
}
public interface IScrollCallbacks {
void onScroll();
void onIdleScroll();
}
public interface OnLastVisible {
void loadMore();
}
}

You can simple override onscrolled method
mRecycler.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (null == mLayoutManager || null == mAdapter) {
return;
}
mVisibleItemCount = mLayoutManager.getChildCount();
mTotalItemCount = mLayoutManager.getItemCount();
mFirstVisibleItemPosition = mLayoutManager.findFirstVisibleItemPosition();
if ((mVisibleItemCount + mFirstVisibleItemPosition) >= mTotalItemCount) {
loadMore();
}
}
});
You can see demo's here:
https://github.com/yefengfreedom/YfRecyclerView

How to implement endless list with RecyclerView?

I would like to change ListView to RecyclerView. I want to use the onScroll of the OnScrollListener in RecyclerView to determine if a user scrolled to the end of the list.
How do I know if a user scrolls to the end of the list so that I can fetch new data from a REST service?

Thanks to #Kushal and this is how I implemented it
private boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (dy > 0) { //check for scroll down
visibleItemCount = mLayoutManager.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loading = false;
Log.v("...", "Last Item Wow !");
// Do pagination.. i.e. fetch new data
loading = true;
}
}
}
}
});
Don't forget to add
LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);

Make these variables.
private int previousTotal = 0;
private boolean loading = true;
private int visibleThreshold = 5;
int firstVisibleItem, visibleItemCount, totalItemCount;
Set on Scroll for recycler view.
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = mRecyclerView.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading && (totalItemCount - visibleItemCount)
<= (firstVisibleItem + visibleThreshold)) {
// End has been reached
Log.i("Yaeye!", "end called");
// Do something
loading = true;
}
}
});
Note : Make sure you are using LinearLayoutManager as layout manager for RecyclerView.
LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
and for a grid
GridLayoutManager mLayoutManager;
mLayoutManager = new GridLayoutManager(getActivity(), spanCount);
mRecyclerView.setLayoutManager(mLayoutManager);
Have fun with your endless scrolls !! ^.^
Update : mRecyclerView.setOnScrollListener() is deprecated just replace with mRecyclerView.addOnScrollListener() and the warning will be gone! You can read more from this SO question.
Since Android now officially support Kotlin, here is an update for the same -
Make OnScrollListener
class OnScrollListener(val layoutManager: LinearLayoutManager, val adapter: RecyclerView.Adapter<RecyclerAdapter.ViewHolder>, val dataList: MutableList<Int>) : RecyclerView.OnScrollListener() {
var previousTotal = 0
var loading = true
val visibleThreshold = 10
var firstVisibleItem = 0
var visibleItemCount = 0
var totalItemCount = 0
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
visibleItemCount = recyclerView.childCount
totalItemCount = layoutManager.itemCount
firstVisibleItem = layoutManager.findFirstVisibleItemPosition()
if (loading) {
if (totalItemCount > previousTotal) {
loading = false
previousTotal = totalItemCount
}
}
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
val initialSize = dataList.size
updateDataList(dataList)
val updatedSize = dataList.size
recyclerView.post { adapter.notifyItemRangeInserted(initialSize, updatedSize) }
loading = true
}
}
}
and add it to your RecyclerView like this
recyclerView.addOnScrollListener(OnScrollListener(layoutManager, adapter, dataList))
For a full code example, feel free to refer this Github repo.

For those who only want to get notified when the last item is totally shown, you can use View.canScrollVertically().
Here is my implementation:
public abstract class OnVerticalScrollListener
extends RecyclerView.OnScrollListener {
#Override
public final void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (!recyclerView.canScrollVertically(-1)) {
onScrolledToTop();
} else if (!recyclerView.canScrollVertically(1)) {
onScrolledToBottom();
} else if (dy < 0) {
onScrolledUp();
} else if (dy > 0) {
onScrolledDown();
}
}
public void onScrolledUp() {}
public void onScrolledDown() {}
public void onScrolledToTop() {}
public void onScrolledToBottom() {}
}
Note: You can use recyclerView.getLayoutManager().canScrollVertically() if you want to support API < 14.

Here is another approach. It will work with any layout manager.
Make Adapter class abstract
Then create an abstract method in adapter class (eg. load())
In onBindViewHolder check the position if last and call load()
Override the load() function while creating the adapter object in your activity or fragment.
In the overided load function implement your loadmore call
For a detail understanding I wrote a blog post and example project get it here
http://sab99r.com/blog/recyclerview-endless-load-more/
MyAdapter.java
public abstract class MyAdapter extends RecyclerView.Adapter<ViewHolder>{
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
//check for last item
if ((position >= getItemCount() - 1))
load();
}
public abstract void load();
}
MyActivity.java
public class MainActivity extends AppCompatActivity {
List<Items> items;
MyAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
...
adapter=new MyAdapter(items){
#Override
public void load() {
//implement your load more here
Item lastItem=items.get(items.size()-1);
loadMore();
}
};
}
}

My answer is a modified version of Noor. I passed from a ListView where i had EndlessScrollListener (that you can find easily in many answers on SO) to a RecyclerView so i wanted a EndlessRecyclScrollListener to easily update my past listener.
So here is the code, hope it helps:
public abstract class EndlessScrollRecyclListener extends RecyclerView.OnScrollListener
{
// The total number of items in the dataset after the last load
private int previousTotalItemCount = 0;
private boolean loading = true;
private int visibleThreshold = 5;
int firstVisibleItem, visibleItemCount, totalItemCount;
private int startingPageIndex = 0;
private int currentPage = 0;
#Override
public void onScrolled(RecyclerView mRecyclerView, int dx, int dy)
{
super.onScrolled(mRecyclerView, dx, dy);
LinearLayoutManager mLayoutManager = (LinearLayoutManager) mRecyclerView
.getLayoutManager();
visibleItemCount = mRecyclerView.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
onScroll(firstVisibleItem, visibleItemCount, totalItemCount);
}
public void onScroll(int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
// 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 = this.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;
currentPage++;
}
// 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.
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem +
visibleThreshold))
{
onLoadMore(currentPage + 1, totalItemCount);
loading = true;
}
}
// Defines the process for actually loading more data based on page
public abstract void onLoadMore(int page, int totalItemsCount);
}

For me, it's very simple:
private boolean mLoading = false;
mList.setOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int totalItem = mLinearLayoutManager.getItemCount();
int lastVisibleItem = mLinearLayoutManager.findLastVisibleItemPosition();
if (!mLoading && lastVisibleItem == totalItem - 1) {
mLoading = true;
// Scrolled to bottom. Do something here.
mLoading = false;
}
}
});
Be careful with asynchronous jobs: mLoading must be changed at the end of the asynchronous jobs. Hope it will be helpful!

With the power of Kotlin's extension functions, the code can look a lot more elegant. Put this anywhere you want (I have it inside an ExtensionFunctions.kt file):
/**
* WARNING: This assumes the layout manager is a LinearLayoutManager
*/
fun RecyclerView.addOnScrolledToEnd(onScrolledToEnd: () -> Unit){
this.addOnScrollListener(object: RecyclerView.OnScrollListener(){
private val VISIBLE_THRESHOLD = 5
private var loading = true
private var previousTotal = 0
override fun onScrollStateChanged(recyclerView: RecyclerView,
newState: Int) {
with(layoutManager as LinearLayoutManager){
val visibleItemCount = childCount
val totalItemCount = itemCount
val firstVisibleItem = findFirstVisibleItemPosition()
if (loading && totalItemCount > previousTotal){
loading = false
previousTotal = totalItemCount
}
if(!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)){
onScrolledToEnd()
loading = true
}
}
}
})
}
And then use it like this:
youRecyclerView.addOnScrolledToEnd {
//What you want to do once the end is reached
}
This solution is based on Kushal Sharma's answer. However, this is a bit better because:
It uses onScrollStateChanged instead of onScroll. This is better because onScroll is called every time there is any sort of movement in the RecyclerView, whereas onScrollStateChanged is only called when the state of the RecyclerView is changed. Using onScrollStateChanged will save you CPU time and, as a consequence, battery.
Since this uses Extension Functions, this can be used in any RecyclerView you have. The client code is just 1 line.

Most answer are assuming the RecyclerView uses a LinearLayoutManager, or GridLayoutManager, or even StaggeredGridLayoutManager, or assuming that the scrolling is vertical or horyzontal, but no one has posted a completly generic answer.
Using the ViewHolder's adapter is clearly not a good solution. An adapter might have more than 1 RecyclerView using it. It "adapts" their contents. It should be the RecyclerView (which is the one class which is responsible of what is currently displayed to the user, and not the adapter which is responsible only to provide content to the RecyclerView) which must notify your system that more items are needed (to load).
Here is my solution, using nothing else than the abstracted classes of the RecyclerView (RecycerView.LayoutManager and RecycerView.Adapter):
/**
* Listener to callback when the last item of the adpater is visible to the user.
* It should then be the time to load more items.
**/
public abstract class LastItemListener extends RecyclerView.OnScrollListener {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// init
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
RecyclerView.Adapter adapter = recyclerView.getAdapter();
if (layoutManager.getChildCount() > 0) {
// Calculations..
int indexOfLastItemViewVisible = layoutManager.getChildCount() -1;
View lastItemViewVisible = layoutManager.getChildAt(indexOfLastItemViewVisible);
int adapterPosition = layoutManager.getPosition(lastItemViewVisible);
boolean isLastItemVisible = (adapterPosition == adapter.getItemCount() -1);
// check
if (isLastItemVisible)
onLastItemVisible(); // callback
}
}
/**
* Here you should load more items because user is seeing the last item of the list.
* Advice: you should add a bollean value to the class
* so that the method {#link #onLastItemVisible()} will be triggered only once
* and not every time the user touch the screen ;)
**/
public abstract void onLastItemVisible();
}
// --- Exemple of use ---
myRecyclerView.setOnScrollListener(new LastItemListener() {
public void onLastItemVisible() {
// start to load more items here.
}
}

Although the accepted answer works perfectly, the solution below uses addOnScrollListener since setOnScrollListener is deprecated, and reduces number of variables, and if conditions.
final LinearLayoutManager layoutManager = new LinearLayoutManager(context);
feedsRecyclerView.setLayoutManager(layoutManager);
feedsRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) {
if ((layoutManager.getChildCount() + layoutManager.findFirstVisibleItemPosition()) >= layoutManager.getItemCount()) {
Log.d("TAG", "End of list");
//loadMore();
}
}
}
});

This is how I do it, simple and short:
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener()
{
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy)
{
if(!recyclerView.canScrollVertically(1) && dy != 0)
{
// Load more results here
}
}
});

Although there are so many answers to the question, I would like to share our experience of creating the endless list view. We have recently implemented custom Carousel LayoutManager that can work in the cycle by scrolling the list infinitely as well as up to a certain point. Here is a detailed description on GitHub.
I suggest you take a look at this article with short but valuable recommendations on creating custom LayoutManagers: http://cases.azoft.com/create-custom-layoutmanager-android/

OK, I did it by using the onBindViewHolder method of RecyclerView.Adapter.
Adapter:
public interface OnViewHolderListener {
void onRequestedLastItem();
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
...
if (position == getItemCount() - 1) onViewHolderListener.onRequestedLastItem();
}
Fragment (or Activity):
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
contentView = inflater.inflate(R.layout.comments_list, container, false);
recyclerView = (RecyclerView) mContentView.findViewById(R.id.my_recycler_view);
adapter = new Adapter();
recyclerView.setAdapter(adapter);
...
adapter.setOnViewHolderListener(new Adapter.OnViewHolderListener() {
#Override
public void onRequestedLastItem() {
//TODO fetch new data from webservice
}
});
return contentView;
}

recyclerList.setOnScrollListener(new RecyclerView.OnScrollListener()
{
#Override
public void onScrolled(RecyclerView recyclerView, int dx,int dy)
{
super.onScrolled(recyclerView, dx, dy);
}
#Override
public void onScrollStateChanged(RecyclerView recyclerView,int newState)
{
int totalItemCount = layoutManager.getItemCount();
int lastVisibleItem = layoutManager.findLastVisibleItemPosition();
if (totalItemCount> 1)
{
if (lastVisibleItem >= totalItemCount - 1)
{
// End has been reached
// do something
}
}
}
});

I would try to extend used LayoutManager (e.g. LinearLayoutManager) and override scrollVerticallyBy() method. Firstly, I would call super first and then check returned integer value. If the value equals to 0 then a bottom or a top border is reached. Then I would use findLastVisibleItemPosition() method to find out which border is reached and load more data if needed. Just an idea.
In addition, you can even return your value from that method allowing overscroll and showing "loading" indicator.

I achieved an infinite scrolling type implementation using this logic in the onBindViewHolder method of my RecyclerView.Adapter class.
if (position == mItems.size() - 1 && mCurrentPage <= mTotalPageCount) {
if (mCurrentPage == mTotalPageCount) {
mLoadImagesListener.noMorePages();
} else {
int newPage = mCurrentPage + 1;
mLoadImagesListener.loadPage(newPage);
}
}
With this code when the RecyclerView gets to the last item, it increments the current page and callbacks on an interface which is responsible for loading more data from the api and adding the new results to the adapter.
I can post more complete example if this isn't clear?

For people who use StaggeredGridLayoutManager here is my implementation, it works for me.
private class ScrollListener extends RecyclerView.OnScrollListener {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
firstVivisibleItems = mLayoutManager.findFirstVisibleItemPositions(firstVivisibleItems);
if(!recyclerView.canScrollVertically(1) && firstVivisibleItems[0]!=0) {
loadMoreImages();
}
}
private boolean loadMoreImages(){
Log.d("myTag", "LAST-------HERE------");
return true;
}
}

There is an easy to use library for this named paginate . Supports both ListView and RecyclerView ( LinearLayout , GridLayout and StaggeredGridLayout).
Here is the link to the project on Github

My way to detect loading event is not to detect scrolling, but to listen whether the last view was attached. If the last view was attached, I regard it as timing to load more content.
class MyListener implements RecyclerView.OnChildAttachStateChangeListener {
RecyclerView mRecyclerView;
MyListener(RecyclerView view) {
mRecyclerView = view;
}
#Override
public void onChildViewAttachedToWindow(View view) {
RecyclerView.Adapter adapter = mRecyclerView.getAdapter();
RecyclerView.LayoutManager mgr = mRecyclerView.getLayoutManager();
int adapterPosition = mgr.getPosition(view);
if (adapterPosition == adapter.getItemCount() - 1) {
// last view was attached
loadMoreContent();
}
#Override
public void onChildViewDetachedFromWindow(View view) {}
}

Create an abstract class and extends RecyclerView.OnScrollListener
public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener {
private int previousTotal = 0;
private boolean loading = true;
private int visibleThreshold;
private int firstVisibleItem, visibleItemCount, totalItemCount;
private RecyclerView.LayoutManager layoutManager;
public EndlessRecyclerOnScrollListener(RecyclerView.LayoutManager layoutManager, int visibleThreshold) {
this.layoutManager = layoutManager; this.visibleThreshold = visibleThreshold;
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = recyclerView.getChildCount();
totalItemCount = layoutManager.getItemCount();
firstVisibleItem = ((LinearLayoutManager)layoutManager).findFirstVisibleItemPosition();
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
onLoadMore();
loading = true;
}
}
public abstract void onLoadMore();}
in activity (or fragment) add addOnScrollListener to recyclerView
LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(mLayoutManager, 3) {
#Override
public void onLoadMore() {
//TODO
...
}
});

I have a pretty detailed example of how to paginate with a RecyclerView. At a high level, I have a set PAGE_SIZE , lets say 30. So I request 30 items and if I get 30 back then I request the next page. If I get less than 30 items I flag a variable to indicate that the last page has been reached and then I stop requesting for more pages. Check it out and let me know what you think.
https://medium.com/#etiennelawlor/pagination-with-recyclerview-1cb7e66a502b

Here my solution using AsyncListUtil, in the web says:
Note that this class uses a single thread to load the data, so it suitable to load data from secondary storage such as disk, but not from network.
but i am using odata to read the data and work fine.
I miss in my example data entities and network methods.
I include only the example adapter.
public class AsyncPlatoAdapter extends RecyclerView.Adapter {
private final AsyncPlatoListUtil mAsyncListUtil;
private final MainActivity mActivity;
private final RecyclerView mRecyclerView;
private final String mFilter;
private final String mOrderby;
private final String mExpand;
public AsyncPlatoAdapter(String filter, String orderby, String expand, RecyclerView recyclerView, MainActivity activity) {
mFilter = filter;
mOrderby = orderby;
mExpand = expand;
mRecyclerView = recyclerView;
mActivity = activity;
mAsyncListUtil = new AsyncPlatoListUtil();
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).
inflate(R.layout.plato_cardview, parent, false);
// Create a ViewHolder to find and hold these view references, and
// register OnClick with the view holder:
return new PlatoViewHolderAsync(itemView, this);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final Plato item = mAsyncListUtil.getItem(position);
PlatoViewHolderAsync vh = (PlatoViewHolderAsync) holder;
if (item != null) {
Integer imagen_id = item.Imagen_Id.get();
vh.getBinding().setVariable(BR.plato, item);
vh.getBinding().executePendingBindings();
vh.getImage().setVisibility(View.VISIBLE);
vh.getProgress().setVisibility(View.GONE);
String cacheName = null;
String urlString = null;
if (imagen_id != null) {
cacheName = String.format("imagenes/imagen/%d", imagen_id);
urlString = String.format("%s/menusapi/%s", MainActivity.ROOTPATH, cacheName);
}
ImageHelper.downloadBitmap(mActivity, vh.getImage(), vh.getProgress(), urlString, cacheName, position);
} else {
vh.getBinding().setVariable(BR.plato, item);
vh.getBinding().executePendingBindings();
//show progress while loading.
vh.getImage().setVisibility(View.GONE);
vh.getProgress().setVisibility(View.VISIBLE);
}
}
#Override
public int getItemCount() {
return mAsyncListUtil.getItemCount();
}
public class AsyncPlatoListUtil extends AsyncListUtil<Plato> {
/**
* Creates an AsyncListUtil.
*/
public AsyncPlatoListUtil() {
super(Plato.class, //my data class
10, //page size
new DataCallback<Plato>() {
#Override
public int refreshData() {
//get count calling ../$count ... odata endpoint
return countPlatos(mFilter, mOrderby, mExpand, mActivity);
}
#Override
public void fillData(Plato[] data, int startPosition, int itemCount) {
//get items from odata endpoint using $skip and $top
Platos p = loadPlatos(mFilter, mOrderby, mExpand, startPosition, itemCount, mActivity);
for (int i = 0; i < Math.min(itemCount, p.value.size()); i++) {
data[i] = p.value.get(i);
}
}
}, new ViewCallback() {
#Override
public void getItemRangeInto(int[] outRange) {
//i use LinearLayoutManager in the RecyclerView
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
outRange[0] = layoutManager.findFirstVisibleItemPosition();
outRange[1] = layoutManager.findLastVisibleItemPosition();
}
#Override
public void onDataRefresh() {
mRecyclerView.getAdapter().notifyDataSetChanged();
}
#Override
public void onItemLoaded(int position) {
mRecyclerView.getAdapter().notifyItemChanged(position);
}
});
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
onRangeChanged();
}
});
}
}
}

if (layoutManager.findLastCompletelyVisibleItemPosition() ==
recyclerAdapter.getItemCount() - 1) {
//load more items.
}
Fair and simple.
This will work.

As #John T suggest. Just use code block below, really short, beauty and simple :D
public void loadMoreOnRecyclerView() {
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(#NonNull #NotNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (!recyclerView.canScrollVertically(1) && dy != 0) {
//Load more items here
}
}
});
}
You can follow my Repo to understand the way that it work.
https://github.com/Nghien-Nghien/PokeAPI-Java/blob/0d8d69d348e068911b883f0ae7791d904cc75cb5/app/src/main/java/com/example/pokemonapi/MainActivity.java
Description info about app like this: https://github.com/skydoves/Pokedex#readme

There is a method public void setOnScrollListener (RecyclerView.OnScrollListener listener) in https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html#setOnScrollListener%28android.support.v7.widget.RecyclerView.OnScrollListener%29. Use that
EDIT:
Override onScrollStateChanged method inside the onScrollListener and do this
boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount;
//loading is used to see if its already loading, you have to manually manipulate this boolean variable
if (loadMore && !loading) {
//end of list reached
}

Check this every thing is explained in detail:
Pagination using RecyclerView From A to Z
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrollStateChanged(RecyclerView recyclerView,
int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int visibleItemCount = mLayoutManager.getChildCount();
int totalItemCount = mLayoutManager.getItemCount();
int firstVisibleItemPosition = mLayoutManager.findFirstVisibleItemPosition();
if (!mIsLoading && !mIsLastPage) {
if ((visibleItemCount + firstVisibleItemPosition) >= totalItemCount
&& firstVisibleItemPosition >= 0) {
loadMoreItems();
}
}
}
})
loadMoreItems():
private void loadMoreItems() {
mAdapter.removeLoading();
//load data here from the server
// in case of success
mAdapter.addData(data);
// if there might be more data
mAdapter.addLoading();
}
in MyAdapter :
private boolean mIsLoadingFooterAdded = false;
public void addLoading() {
if (!mIsLoadingFooterAdded) {
mIsLoadingFooterAdded = true;
mLineItemList.add(new LineItem());
notifyItemInserted(mLineItemList.size() - 1);
}
}
public void removeLoading() {
if (mIsLoadingFooterAdded) {
mIsLoadingFooterAdded = false;
int position = mLineItemList.size() - 1;
LineItem item = mLineItemList.get(position);
if (item != null) {
mLineItemList.remove(position);
notifyItemRemoved(position);
}
}
}
public void addData(List<YourDataClass> data) {
for (int i = 0; i < data.size(); i++) {
YourDataClass yourDataObject = data.get(i);
mLineItemList.add(new LineItem(yourDataObject));
notifyItemInserted(mLineItemList.size() - 1);
}
}

None of these answers take into account if the list is too small or not.
Here's a piece of code I've been using that works on RecycleViews in both directions.
#Override
public boolean onTouchEvent(MotionEvent motionEvent) {
if (recyclerViewListener == null) {
return super.onTouchEvent(motionEvent);
}
/**
* If the list is too small to scroll.
*/
if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
if (!canScrollVertically(1)) {
recyclerViewListener.reachedBottom();
} else if (!canScrollVertically(-1)) {
recyclerViewListener.reachedTop();
}
}
return super.onTouchEvent(motionEvent);
}
public void setListener(RecyclerViewListener recycleViewListener) {
this.recyclerViewListener = recycleViewListener;
addOnScrollListener(new OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (recyclerViewListener == null) {
return;
}
recyclerViewListener.scrolling(dy);
if (!canScrollVertically(1)) {
recyclerViewListener.reachedBottom();
} else if (!canScrollVertically(-1)) {
recyclerViewListener.reachedTop();
}
}
});
}

I let you my aproximation. Works fine for me.
I hope it helps you.
/**
* Created by Daniel Pardo Ligorred on 03/03/2016.
*/
public abstract class BaseScrollListener extends RecyclerView.OnScrollListener {
protected RecyclerView.LayoutManager layoutManager;
public BaseScrollListener(RecyclerView.LayoutManager layoutManager) {
this.layoutManager = layoutManager;
this.init();
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
this.onScroll(recyclerView, this.getFirstVisibleItem(), this.layoutManager.getChildCount(), this.layoutManager.getItemCount(), dx, dy);
}
private int getFirstVisibleItem(){
if(this.layoutManager instanceof LinearLayoutManager){
return ((LinearLayoutManager) this.layoutManager).findFirstVisibleItemPosition();
} else if (this.layoutManager instanceof StaggeredGridLayoutManager){
int[] spanPositions = null; //Should be null -> StaggeredGridLayoutManager.findFirstVisibleItemPositions makes the work.
try{
return ((StaggeredGridLayoutManager) this.layoutManager).findFirstVisibleItemPositions(spanPositions)[0];
}catch (Exception ex){
// Do stuff...
}
}
return 0;
}
public abstract void init();
protected abstract void onScroll(RecyclerView recyclerView, int firstVisibleItem, int visibleItemCount, int totalItemCount, int dx, int dy);
}

#kushal #abdulaziz
Why not use this logic instead?
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
int totalItemCount, lastVisibleItemPosition;
if (dy > 0) {
totalItemCount = _layoutManager.getItemCount();
lastVisibleItemPosition = _layoutManager.findLastVisibleItemPosition();
if (!_isLastItem) {
if ((totalItemCount - 1) == lastVisibleItemPosition) {
LogUtil.e("end_of_list");
_isLastItem = true;
}
}
}
}

Try below:
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.LayoutManager;
/**
* Abstract Endless ScrollListener
*
*/
public abstract class EndlessScrollListener extends
RecyclerView.OnScrollListener {
// The minimum amount of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 10;
// The current offset index of data you have loaded
private int currentPage = 1;
// True if we are still waiting for the last set of data to load.
private boolean loading = true;
// The total number of items in the data set after the last load
private int previousTotal = 0;
private int firstVisibleItem;
private int visibleItemCount;
private int totalItemCount;
private LayoutManager layoutManager;
public EndlessScrollListener(LayoutManager layoutManager) {
validateLayoutManager(layoutManager);
this.layoutManager = layoutManager;
}
public EndlessScrollListener(int visibleThreshold,
LayoutManager layoutManager, int startPage) {
validateLayoutManager(layoutManager);
this.visibleThreshold = visibleThreshold;
this.layoutManager = layoutManager;
this.currentPage = startPage;
}
private void validateLayoutManager(LayoutManager layoutManager)
throws IllegalArgumentException {
if (null == layoutManager
|| !(layoutManager instanceof GridLayoutManager)
|| !(layoutManager instanceof LinearLayoutManager)) {
throw new IllegalArgumentException(
"LayoutManager must be of type GridLayoutManager or LinearLayoutManager.");
}
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = recyclerView.getChildCount();
totalItemCount = layoutManager.getItemCount();
if (layoutManager instanceof GridLayoutManager) {
firstVisibleItem = ((GridLayoutManager) layoutManager)
.findFirstVisibleItemPosition();
} else if (layoutManager instanceof LinearLayoutManager) {
firstVisibleItem = ((LinearLayoutManager) layoutManager)
.findFirstVisibleItemPosition();
}
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading
&& (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
// End has been reached do something
currentPage++;
onLoadMore(currentPage);
loading = true;
}
}
// Defines the process for actually loading more data based on page
public abstract void onLoadMore(int page);
}

I have created LoadMoreRecyclerView using Abdulaziz Noor Answer
LoadMoreRecyclerView
public class LoadMoreRecyclerView extends RecyclerView {
private boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
//WrapperLinearLayout is for handling crash in RecyclerView
private WrapperLinearLayout mLayoutManager;
private Context mContext;
private OnLoadMoreListener onLoadMoreListener;
public LoadMoreRecyclerView(Context context) {
super(context);
mContext = context;
init();
}
public LoadMoreRecyclerView(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
mContext = context;
init();
}
public LoadMoreRecyclerView(Context context, #Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
init();
}
private void init(){
mLayoutManager = new WrapperLinearLayout(mContext,LinearLayoutManager.VERTICAL,false);
this.setLayoutManager(mLayoutManager);
this.setItemAnimator(new DefaultItemAnimator());
this.setHasFixedSize(true);
}
#Override
public void onScrolled(int dx, int dy) {
super.onScrolled(dx, dy);
if(dy > 0) //check for scroll down
{
visibleItemCount = mLayoutManager.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();
if (loading)
{
if ( (visibleItemCount + pastVisiblesItems) >= totalItemCount)
{
loading = false;
Log.v("...", "Call Load More !");
if(onLoadMoreListener != null){
onLoadMoreListener.onLoadMore();
}
//Do pagination.. i.e. fetch new data
}
}
}
}
#Override
public void onScrollStateChanged(int state) {
super.onScrollStateChanged(state);
}
public void onLoadMoreCompleted(){
loading = true;
}
public void setMoreLoading(boolean moreLoading){
loading = moreLoading;
}
public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
this.onLoadMoreListener = onLoadMoreListener;
}
}
WrapperLinearLayout
public class WrapperLinearLayout extends LinearLayoutManager
{
public WrapperLinearLayout(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
#Override
public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
try {
super.onLayoutChildren(recycler, state);
} catch (IndexOutOfBoundsException e) {
Log.e("probe", "meet a IOOBE in RecyclerView");
}
}
}
//Add it in xml like
<your.package.LoadMoreRecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
</your.package.LoadMoreRecyclerView>
OnCreate or onViewCreated
mLoadMoreRecyclerView = (LoadMoreRecyclerView) view.findViewById(R.id.recycler_view);
mLoadMoreRecyclerView.setOnLoadMoreListener(new OnLoadMoreListener() {
#Override
public void onLoadMore() {
callYourService(StartIndex);
}
});
callYourService
private void callYourService(){
//callyour Service and get response in any List
List<AnyModelClass> newDataFromServer = getDataFromServerService();
//Enable Load More
mLoadMoreRecyclerView.onLoadMoreCompleted();
if(newDataFromServer != null && newDataFromServer.size() > 0){
StartIndex += newDataFromServer.size();
if (newDataFromServer.size() < Integer.valueOf(MAX_ROWS)) {
//StopLoading..
mLoadMoreRecyclerView.setMoreLoading(false);
}
}
else{
mLoadMoreRecyclerView.setMoreLoading(false);
mAdapter.notifyDataSetChanged();
}
}