Saya memiliki kode ini untuk RecyclerView.

    recyclerView = (RecyclerView)rootview.findViewById(R.id.fabric_recyclerView);
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.addItemDecoration(new RV_Item_Spacing(5));
    FabricAdapter fabricAdapter=new FabricAdapter(ViewAdsCollection.getFabricAdsDetailsAsArray());
    recyclerView.setAdapter(fabricAdapter);

Saya perlu tahu kapan RecyclerView mencapai posisi paling bawah saat menggulir. Apa itu mungkin ? Jika ya, bagaimana caranya?

ada juga cara sederhana untuk melakukannya

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);

        if (!recyclerView.canScrollVertically(1)) {
            Toast.makeText(YourActivity.this, "Last", Toast.LENGTH_LONG).show();

        }
    }
});

arah bilangan bulat: -1 untuk atas, 1 untuk bawah, 0 akan selalu mengembalikan false.

Gunakan kode ini untuk menghindari panggilan berulang

    recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);

            if (!recyclerView.canScrollVertically(1) && newState==RecyclerView.SCROLL_STATE_IDLE) {
                Log.d("-----","end");
                
            }
        }
    });

Cukup terapkan addOnScrollListener () di recyclerview Anda. Kemudian di dalam pendengar gulir, terapkan kode di bawah ini.

RecyclerView.OnScrollListener mScrollListener = new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            if (mIsLoading)
                return;
            int visibleItemCount = mLayoutManager.getChildCount();
            int totalItemCount = mLayoutManager.getItemCount();
            int pastVisibleItems = mLayoutManager.findFirstVisibleItemPosition();
            if (pastVisibleItems + visibleItemCount >= totalItemCount) {
                //End of list
            }
        }
    };

Jawabannya ada di Kotlin, ini akan berfungsi di Java. IntelliJ harus mengubahnya untuk Anda jika Anda menyalin dan menempel.

recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener(){

    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {

        // 3 lines below are not needed.
        Log.d("TAG","Last visible item is: ${gridLayoutManager.findLastVisibleItemPosition()}")
        Log.d("TAG","Item count is: ${gridLayoutManager.itemCount}")
        Log.d("TAG","end? : ${gridLayoutManager.findLastVisibleItemPosition() == gridLayoutManager.itemCount-1}")

        if(gridLayoutManager.findLastVisibleItemPosition() == gridLayoutManager.itemCount-1){
            // We have reached the end of the recycler view.
        }

        super.onScrolled(recyclerView, dx, dy)
    }
})

Ini juga akan berfungsi LinearLayoutManagerkarena memiliki metode yang sama yang digunakan di atas. Yaitu findLastVisibleItemPosition()dan getItemCount()( itemCountdi Kotlin).

Saya tidak mendapatkan solusi sempurna dengan jawaban di atas karena itu memicu dua kali bahkan pada onScrolled

override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            super.onScrolled(recyclerView, dx, dy)
           if( !recyclerView.canScrollVertically(RecyclerView.FOCUS_DOWN))
               context?.toast("Scroll end reached")
        }

Coba ini

Saya telah menggunakan jawaban di atas, itu selalu berjalan ketika Anda akan pergi di ujung tampilan pendaur ulang,

Jika Anda ingin memeriksa hanya satu kali apakah di bawah atau tidak? Contoh: - Jika saya memiliki daftar 10 item setiap kali saya pergi ke bawah itu akan menampilkan saya dan lagi jika saya menggulir dari atas ke bawah itu tidak akan mencetak lagi, dan jika Anda menambahkan lebih banyak daftar dan Anda pergi ke sana itu akan ditampilkan lagi.

Catatan: - Gunakan metode ini saat Anda menangani offset dalam menekan API

1. Buat kelas bernama EndlessRecyclerViewScrollListener

       import android.support.v7.widget.GridLayoutManager;
       import android.support.v7.widget.LinearLayoutManager;
       import android.support.v7.widget.RecyclerView;
       import android.support.v7.widget.StaggeredGridLayoutManager;
   
       public abstract class EndlessRecyclerViewScrollListener extends RecyclerView.OnScrollListener {
           // The minimum amount of items to have below your current scroll position
           // before loading more.
           private int visibleThreshold = 5;
           // The current offset index of data you have loaded
           private int currentPage = 0;
           // The total number of items in the dataset after the last load
           private int previousTotalItemCount = 0;
           // True if we are still waiting for the last set of data to load.
           private boolean loading = true;
           // Sets the starting page index
           private int startingPageIndex = 0;
   
           RecyclerView.LayoutManager mLayoutManager;
   
           public EndlessRecyclerViewScrollListener(LinearLayoutManager layoutManager) {
               this.mLayoutManager = layoutManager;
           }
   
       //    public EndlessRecyclerViewScrollListener() {
       //        this.mLayoutManager = layoutManager;
       //        visibleThreshold = visibleThreshold * layoutManager.getSpanCount();
       //    }
   
           public EndlessRecyclerViewScrollListener(StaggeredGridLayoutManager layoutManager) {
               this.mLayoutManager = layoutManager;
               visibleThreshold = visibleThreshold * layoutManager.getSpanCount();
           }
   
           public int getLastVisibleItem(int[] lastVisibleItemPositions) {
               int maxSize = 0;
               for (int i = 0; i < lastVisibleItemPositions.length; i++) {
                   if (i == 0) {
                       maxSize = lastVisibleItemPositions[i];
                   }
                   else if (lastVisibleItemPositions[i] > maxSize) {
                       maxSize = lastVisibleItemPositions[i];
                   }
               }
               return maxSize;
           }
   
           // This happens many times a second during a scroll, so be wary of the code you place here.
           // We are given a few useful parameters to help us work out if we need to load some more data,
           // but first we check if we are waiting for the previous load to finish.
           @Override
           public void onScrolled(RecyclerView view, int dx, int dy) {
               int lastVisibleItemPosition = 0;
               int totalItemCount = mLayoutManager.getItemCount();
   
               if (mLayoutManager instanceof StaggeredGridLayoutManager) {
                   int[] lastVisibleItemPositions = ((StaggeredGridLayoutManager) mLayoutManager).findLastVisibleItemPositions(null);
                   // get maximum element within the list
                   lastVisibleItemPosition = getLastVisibleItem(lastVisibleItemPositions);
               } else if (mLayoutManager instanceof GridLayoutManager) {
                   lastVisibleItemPosition = ((GridLayoutManager) mLayoutManager).findLastVisibleItemPosition();
               } else if (mLayoutManager instanceof LinearLayoutManager) {
                   lastVisibleItemPosition = ((LinearLayoutManager) mLayoutManager).findLastVisibleItemPosition();
               }
   
               // 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;
               }
   
               // If it isn’t currently loading, we check to see if we have breached
               // the visibleThreshold and need to reload more data.
               // If we do need to reload some more data, we execute onLoadMore to fetch the data.
               // threshold should reflect how many total columns there are too
               if (!loading && (lastVisibleItemPosition + visibleThreshold) > totalItemCount) {
                   currentPage++;
                   onLoadMore(currentPage, totalItemCount, view);
                   loading = true;
               }
           }
   
           // Call this method whenever performing new searches
           public void resetState() {
               this.currentPage = this.startingPageIndex;
               this.previousTotalItemCount = 0;
               this.loading = true;
           }
   
           // Defines the process for actually loading more data based on page
           public abstract void onLoadMore(int page, int totalItemsCount, RecyclerView view);
   
       }
   

2. gunakan kelas ini seperti ini

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
           recyclerView.setLayoutManager(linearLayoutManager);
           recyclerView.addOnScrollListener(new EndlessRecyclerViewScrollListener( linearLayoutManager) {
               @Override
               public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
                   Toast.makeText(getActivity(),"LAst",Toast.LENGTH_LONG).show();
               }
           });
   

Ini berjalan sempurna di akhir saya, beri tahu saya jika Anda mendapatkan masalah apa pun

Ada implementasi saya, itu sangat berguna untuk StaggeredGridLayout.

Penggunaan:

private EndlessScrollListener scrollListener =
        new EndlessScrollListener(new EndlessScrollListener.RefreshList() {
            @Override public void onRefresh(int pageNumber) {
                //end of the list
            }
        });

rvMain.addOnScrollListener(scrollListener);

Implementasi pendengar:

class EndlessScrollListener extends RecyclerView.OnScrollListener {
private boolean isLoading;
private boolean hasMorePages;
private int pageNumber = 0;
private RefreshList refreshList;
private boolean isRefreshing;
private int pastVisibleItems;

EndlessScrollListener(RefreshList refreshList) {
    this.isLoading = false;
    this.hasMorePages = true;
    this.refreshList = refreshList;
}

@Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);
    StaggeredGridLayoutManager manager =
            (StaggeredGridLayoutManager) recyclerView.getLayoutManager();

    int visibleItemCount = manager.getChildCount();
    int totalItemCount = manager.getItemCount();
    int[] firstVisibleItems = manager.findFirstVisibleItemPositions(null);
    if (firstVisibleItems != null && firstVisibleItems.length > 0) {
        pastVisibleItems = firstVisibleItems[0];
    }

    if (visibleItemCount + pastVisibleItems >= totalItemCount && !isLoading) {
        isLoading = true;
        if (hasMorePages && !isRefreshing) {
            isRefreshing = true;
            new Handler().postDelayed(new Runnable() {
                @Override public void run() {
                    refreshList.onRefresh(pageNumber);
                }
            }, 200);
        }
    } else {
        isLoading = false;
    }
}

public void noMorePages() {
    this.hasMorePages = false;
}

void notifyMorePages() {
    isRefreshing = false;
    pageNumber = pageNumber + 1;
}

interface RefreshList {
    void onRefresh(int pageNumber);
}  }

Saya juga mencari pertanyaan ini tetapi saya tidak menemukan jawaban yang memuaskan saya, jadi saya membuat realisasi recyclerView sendiri.

solusi lain kurang tepat dibandingkan solusi saya. misalnya: jika item terakhir cukup besar (banyak teks) maka callback solusi lain akan datang jauh lebih awal, kemudian recyclerView benar-benar mencapai paling bawah.

solusi saya memperbaiki masalah ini.

class CustomRecyclerView: RecyclerView{

    abstract class TopAndBottomListener{
        open fun onBottomNow(onBottomNow:Boolean){}
        open fun onTopNow(onTopNow:Boolean){}
    }


    constructor(c:Context):this(c, null)
    constructor(c:Context, attr:AttributeSet?):super(c, attr, 0)
    constructor(c:Context, attr:AttributeSet?, defStyle:Int):super(c, attr, defStyle)


    private var linearLayoutManager:LinearLayoutManager? = null
    private var topAndBottomListener:TopAndBottomListener? = null
    private var onBottomNow = false
    private var onTopNow = false
    private var onBottomTopScrollListener:RecyclerView.OnScrollListener? = null


    fun setTopAndBottomListener(l:TopAndBottomListener?){
        if (l != null){
            checkLayoutManager()

            onBottomTopScrollListener = createBottomAndTopScrollListener()
            addOnScrollListener(onBottomTopScrollListener)
            topAndBottomListener = l
        } else {
            removeOnScrollListener(onBottomTopScrollListener)
            topAndBottomListener = null
        }
    }

    private fun createBottomAndTopScrollListener() = object :RecyclerView.OnScrollListener(){
        override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            checkOnTop()
            checkOnBottom()
        }
    }

    private fun checkOnTop(){
        val firstVisible = linearLayoutManager!!.findFirstCompletelyVisibleItemPosition()
        if(firstVisible == 0 || firstVisible == -1 && !canScrollToTop()){
            if (!onTopNow) {
                onTopNow = true
                topAndBottomListener?.onTopNow(true)
            }
        } else if (onTopNow){
            onTopNow = false
            topAndBottomListener?.onTopNow(false)
        }
    }

    private fun checkOnBottom(){
        var lastVisible = linearLayoutManager!!.findLastCompletelyVisibleItemPosition()
        val size = linearLayoutManager!!.itemCount - 1
        if(lastVisible == size || lastVisible == -1 && !canScrollToBottom()){
            if (!onBottomNow){
                onBottomNow = true
                topAndBottomListener?.onBottomNow(true)
            }
        } else if(onBottomNow){
            onBottomNow = false
            topAndBottomListener?.onBottomNow(false)
        }
    }


    private fun checkLayoutManager(){
        if (layoutManager is LinearLayoutManager)
            linearLayoutManager = layoutManager as LinearLayoutManager
        else
            throw Exception("for using this listener, please set LinearLayoutManager")
    }

    private fun canScrollToTop():Boolean = canScrollVertically(-1)
    private fun canScrollToBottom():Boolean = canScrollVertically(1)
}

lalu di aktivitas / fragmen Anda:

override fun onCreate() {
    customRecyclerView.layoutManager = LinearLayoutManager(context)
}

override fun onResume() {
    super.onResume()
    customRecyclerView.setTopAndBottomListener(this)
}

override fun onStop() {
    super.onStop()
    customRecyclerView.setTopAndBottomListener(null)
}

berharap itu akan membantu seseorang ;-)

Setelah tidak puas dengan sebagian besar jawaban lain di utas ini, saya menemukan sesuatu yang menurut saya lebih baik dan tidak ada di mana pun di sini.

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        if (!recyclerView.canScrollVertically(1) && dy > 0)
        {
             //scrolled to bottom
        }else if (!recyclerView.canScrollVertically(-1) && dy < 0)
        {
            //scrolled to bottom
        }
    }
});

Ini sederhana dan akan memukul tepat satu kali dalam semua kondisi ketika Anda menggulir ke atas atau bawah.

Ini solusi saya:

    val onScrollListener = object : RecyclerView.OnScrollListener() {

    override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
        directionDown = dy > 0
    }

    override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
        if (recyclerView.canScrollVertically(1).not()
                && state != State.UPDATING
                && newState == RecyclerView.SCROLL_STATE_IDLE
                && directionDown) {
               state = State.UPDATING
            // TODO do what you want  when you reach bottom, direction
            // is down and flag for non-duplicate execution
        }
    }
}

Kita bisa menggunakan Interface untuk mendapatkan posisi tersebut

Antarmuka: Buat Antarmuka untuk pendengar

public interface OnTopReachListener { void onTopReached(int position);}

Aktivitas :

mediaRecycleAdapter = new MediaRecycleAdapter(Class.this, taskList); recycle.setAdapter(mediaRecycleAdapter); mediaRecycleAdapter.setOnSchrollPostionListener(new OnTopReachListener() {
@Override
public void onTopReached(int position) {
    Log.i("Position","onTopReached "+position);  
}
});

Adaptor:

public void setOnSchrollPostionListener(OnTopReachListener topReachListener) {
    this.topReachListener = topReachListener;}@Override public void onBindViewHolder(MyViewHolder holder, int position) {if(position == 0) {
  topReachListener.onTopReached(position);}}