How to implement endless list with RecyclerView

Question

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

User · Answer

No repetition calls however you scroll  fetchData will be called only when you are at the end of the list and there is more data to be fetched Regarding my code  1 fetchData   fetches 10 items on each call  2 isScrolling is a class member variable 3 previousTotalCount is also a class member  It stores previously visited last item recyclerView addOnScrollListener object   RecyclerView OnScrollListener                 override fun onScrollStateChanged recyclerView  RecyclerView  newState  Int                    super onScrollStateChanged recyclerView  newState                  if  newState    AbsListView OnScrollListener SCROLL STATE TOUCH SCROLL                        isScrolling   true                                              override fun onScrolled recyclerView  RecyclerView  dx  Int  dy  Int                    super onScrolled recyclerView  dx  dy                   val visibleItemCount   layoutManager childCount                 val totalItemCount   layoutManager itemCount                 val scrolledOutItems   layoutManager findFirstVisibleItemPosition                     if  isScrolling  amp  amp   visibleItemCount   scrolledOutItems    totalItemCount                       amp  amp   visibleItemCount   scrolledOutItems    previousTotalCount                         previousTotalCount   totalItemCount                                   isScrolling   false                     fetchData      fetches 10 new items from Firestore                     pagingProgressBar visibility   View VISIBLE

User · Answer

Here is example for Simple Implementation of Endless Scrolling RecyclerView using a Simple Library compiled from the various sources   Add this line in build gradle  implementation  com hereshem lib awesomelib 2 0 1    Create RecyclerView Layout in Activity with   lt com hereshem lib recycler MyRecyclerView         android id    id recycler          app layoutManager  LinearLayoutManager          android layout width  match parent          android layout height  match parent   gt    Create a ViewHolder by passing the class it supports  public static class EVHolder extends MyViewHolder lt Events gt        TextView date  title  summary      public EVHolder View v            super v           date   v findViewById R id date           title   v findViewById R id title           summary   v findViewById R id summary              Override     public void bindView Events c            date setText c date           title setText c title           summary setText c summary             Create Items List variable and adapters with very few lines by passing items  class and layout in the adapter  List lt Events gt  items   new ArrayList lt  gt     MyRecyclerView recycler   findViewById R id recycler   RecyclerViewAdapter adapter   new RecyclerViewAdapter this  items  EVHolder class  R layout row event   recycler setAdapter adapter     ClickListener and LoadMore Listener can be added with following lines  recycler setOnItemClickListener new MyRecyclerView OnItemClickListener          Override     public void onItemClick int position            Toast makeText MainActivity this   Recycler Item Clicked     position  Toast LENGTH SHORT  show               recycler setOnLoadMoreListener new MyRecyclerView OnLoadMoreListener          Override     public void onLoadMore             loadData              loadData      After the data is loaded this must be called  recycler loadComplete      When no LoadMore is required LoadMore layout can be hidden by calling  recycler hideLoadMore      More example can be found here  Hope this helps

User · Answer

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 lt Plato gt                           Creates an AsyncListUtil                      public AsyncPlatoListUtil                 super Plato class    my data class                     10    page size                     new DataCallback lt Plato gt                               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  lt  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

User · Answer

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 lt ViewHolder gt             Override         public void onBindViewHolder ViewHolder holder  int position                  check for last item             if   position  gt   getItemCount   - 1                   load                       public abstract void load        MyActivity java  public class MainActivity extends AppCompatActivity       List lt Items gt  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

User · Answer

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

User · Answer

I just tried this       final LinearLayoutManager rvLayoutManager   new LinearLayoutManager this       rvMovieList    RecyclerView  findViewById R id rvMovieList       rvMovieList setLayoutManager rvLayoutManager       adapter   new MovieRecyclerAdapter this  movies       rvMovieList setAdapter adapter       adapter notifyDataSetChanged         rvMovieList addOnScrollListener new OnScrollListener             boolean loading   true          int pastVisiblesItems  visibleItemCount  totalItemCount           Override         public void onScrolled RecyclerView recyclerView  int dx  int dy                super onScrolled recyclerView  dx  dy                visibleItemCount   rvLayoutManager getChildCount                totalItemCount   rvLayoutManager getItemCount                pastVisiblesItems   rvLayoutManager findFirstVisibleItemPosition                 int lastitem   visibleItemCount   pastVisiblesItems               if   lastitem    totalItemCount                      amp  amp  page  lt  total pages                      amp  amp   keyword equals                            hit bottom                     String strnext                  if  page    total pages - 1                        int last   total results -  page   20                       strnext   String format getResources   getString R string next   last                     else                       strnext   String format getResources   getString R string next   20                                     btNext setText strnext                   btNext setVisibility View VISIBLE                 else                   btNext setVisibility View INVISIBLE                              if pastVisiblesItems    0  amp  amp   page  gt  1                      hit top                 btPrev setVisibility View VISIBLE                 else                   btPrev setVisibility View INVISIBLE                                     I ve got confused where to put loading with true or false  so I try to remove it  and this code works as I expected

User · Answer

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  gt  previousTotal            loading   false          previousTotal   totalItemCount          if   loading  amp  amp   totalItemCount - visibleItemCount   lt    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

User · Answer

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  lt  0                onScrolledUp              else if  dy  gt  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  lt  14

User · Answer

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  gt  previousTotal                    loading   false                  previousTotal   totalItemCount                                  if   loading                  amp  amp   totalItemCount - visibleItemCount   lt    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

User · Answer

erdna Please refer my below code May be it will become helpful to you        int firstVisibleItem  visibleItemCount  totalItemCount     recyclerView setOnScrollListener new RecyclerView OnScrollListener               Override         public void onScrolled RecyclerView recyclerView  int dx  int dy                super onScrolled recyclerView  dx  dy                visibleItemCount   layoutManager getChildCount                totalItemCount   layoutManager getItemCount                firstVisibleItem   layoutManager findFirstVisibleItemPosition                Log e  firstVisibleItem   firstVisibleItem                    Log e  visibleItemCount   visibleItemCount                    Log e  totalItemCount   totalItemCount                     if  page    total page index                    if  loading                        if   visibleItemCount   firstVisibleItem   gt   totalItemCount                            Log e  page   String valueOf page                            page page 1                          new GetSummary   execute String valueOf page                                loading   false

User · Answer

It is also possible to implement without the scroll listener  using the pure logic of the data model alone  The scroll view requires to get items by position as well as the maximal item count  The model can have the background logic to fetch the needed items in chunks  rather than one by one  and do this in the background thread  notifying the view when the data are ready   This approach allows to have the fetching queue which prefers most recently requested  so currently visible  items over older  most likely already scrolled away  submissions  control the number of parallel threads to use and things the like  The complete source code for this approach  demo app and reusable library  are available here

User · Answer

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   amp  amp  firstVivisibleItems 0   0                loadMoreImages                          private boolean loadMoreImages            Log d  myTag    LAST-------HERE------            return true

User · Answer

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  gt  previousTotal                    loading   false                  previousTotal   totalItemCount                                  if   loading  amp  amp   totalItemCount - visibleItemCount                lt    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 lt RecyclerAdapter ViewHolder gt   val dataList  MutableList lt Int gt     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  gt  previousTotal                    loading   false                 previousTotal   totalItemCount                                  if   loading  amp  amp   totalItemCount - visibleItemCount   lt    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

User · Answer

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  gt  0      check for scroll down             visibleItemCount   mLayoutManager getChildCount                totalItemCount   mLayoutManager getItemCount                pastVisiblesItems   mLayoutManager findFirstVisibleItemPosition                 if  loading                    if   visibleItemCount   pastVisiblesItems   gt   totalItemCount                        loading   false                      Log v  quot     quot    quot Last Item Wow   quot                           Do pagination   i e  fetch new data                      loading   true                                                       Don t forget to add LinearLayoutManager mLayoutManager  mLayoutManager   new LinearLayoutManager this   mRecyclerView setLayoutManager mLayoutManager

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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   amp  amp  dy    0                                   Load more results here

User · Answer

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 gt  1                                                 if  lastVisibleItem  gt   totalItemCount - 1                                                            End has been reached                                do something

User · Answer

I achieved an infinite scrolling type implementation using this logic in the onBindViewHolder method of my RecyclerView Adapter class        if  position    mItems size   - 1  amp  amp  mCurrentPage  lt   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

User · Answer

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    gt  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

User · Answer

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     - gt  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  amp  amp  totalItemCount  gt  previousTotal                        loading   false                     previousTotal   totalItemCount                                    if  loading  amp  amp   totalItemCount - visibleItemCount   lt    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

User · Answer

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  amp  amp  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

User · Answer

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  gt  0                   if   layoutManager getChildCount     layoutManager findFirstVisibleItemPosition     gt   layoutManager getItemCount                      Log d  TAG    End of list                      loadMore

User · Answer

This solution works perfectly for me     Listener      public abstract class InfiniteScrollListener     extendsRecyclerView OnScrollListener    public static String TAG   InfiniteScrollListener class getSimpleName    int firstVisibleItem  visibleItemCount  totalItemCount  private int previousTotal   0  private boolean loading   true  private int visibleThreshold   1  private int current page   1   private LinearLayoutManager mLinearLayoutManager   public InfiniteScrollListener LinearLayoutManager linearLayoutManager        this mLinearLayoutManager   linearLayoutManager      Override public void onScrolled RecyclerView recyclerView  int dx  int dy        super onScrolled recyclerView  dx  dy        visibleItemCount   recyclerView getChildCount        totalItemCount   mLinearLayoutManager getItemCount        firstVisibleItem   mLinearLayoutManager findFirstVisibleItemPosition         if  loading            if  totalItemCount  gt  previousTotal                loading   false              previousTotal   totalItemCount                      if   loading  amp  amp   totalItemCount - visibleItemCount - firstVisibleItem  lt   visibleThreshold              current page             onLoadMore current page            loading   true           public void resetState         loading   true      previousTotal   0      current page   1     public abstract void onLoadMore int current page        Implementation into fragment   private InfiniteScrollListener scrollListener   scrollListener   new InfiniteScrollListener manager             Override         public void onLoadMore int current page                  Load data                      rv setLayoutManager manager       rv addOnScrollListener scrollListener

User · Answer

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  gt  0    check for scroll down                       visibleItemCount   mLayoutManager getChildCount                totalItemCount   mLayoutManager getItemCount                pastVisiblesItems   mLayoutManager findFirstVisibleItemPosition                 if  loading                                if    visibleItemCount   pastVisiblesItems   gt   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   lt your package LoadMoreRecyclerView     android id    id recycler view      android layout width  match parent      android layout height  match parent  gt   lt  your package LoadMoreRecyclerView gt    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 lt AnyModelClass gt  newDataFromServer   getDataFromServerService          Enable Load More     mLoadMoreRecyclerView onLoadMoreCompleted         if newDataFromServer    null  amp  amp  newDataFromServer size    gt  0               StartIndex    newDataFromServer size                 if  newDataFromServer size    lt  Integer valueOf MAX ROWS                           StopLoading                      mLoadMoreRecyclerView setMoreLoading false                           else              mLoadMoreRecyclerView setMoreLoading false               mAdapter notifyDataSetChanged

User · Answer

kushal  abdulaziz    Why not use this logic instead   public void onScrolled RecyclerView recyclerView  int dx  int dy        int totalItemCount  lastVisibleItemPosition       if  dy  gt  0          totalItemCount    layoutManager getItemCount          lastVisibleItemPosition    layoutManager findLastVisibleItemPosition           if    isLastItem            if   totalItemCount - 1     lastVisibleItemPosition              LogUtil e  end of list                isLastItem   true

User · Answer

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 - gt  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

User · Answer

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

User · Answer

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  gt   totalItemCount                 loading is used to see if its already loading  you have to manually manipulate this boolean variable             if  loadMore  amp  amp   loading                       end of list reached

User · Answer

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

User · Answer

if  layoutManager findLastCompletelyVisibleItemPosition        recyclerAdapter getItemCount   - 1          load more items       Fair and simple  This will work

User · Answer

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  lt  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  amp  amp   totalItemCount  gt  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  amp  amp   totalItemCount - visibleItemCount   lt    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

User · Answer

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

User · Answer

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  amp  amp   mIsLastPage                if   visibleItemCount   firstVisibleItemPosition   gt   totalItemCount                      amp  amp  firstVisibleItemPosition  gt   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 lt YourDataClass gt  data         for  int i   0  i  lt  data size    i              YourDataClass yourDataObject   data get i           mLineItemList add new LineItem yourDataObject            notifyItemInserted mLineItemList size   - 1

[android] How to implement endless list with RecyclerView?

Examples related to android

Examples related to listview

Examples related to android-recyclerview

Examples related to material-design

Examples related to onscrolllistener