RecyclerView için bu koda sahibim.

    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);

Kaydırma sırasında RecyclerView'ın en alt konuma ne zaman ulaştığını bilmem gerekiyor. Mümkün mü ? Varsa nasıl?

bunu yapmanın da basit bir yolu var

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();

        }
    }
});

yön tamsayıları: Yukarı için -1, aşağı için 1, 0 her zaman yanlış döndürür.

Tekrarlanan aramalardan kaçınmak için bu kodu kullanın

    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");
                
            }
        }
    });

Sadece geri dönüşüm görünümünüze bir addOnScrollListener () uygulayın. Ardından kaydırma dinleyicisinin içinde aşağıdaki kodu uygulayın.

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
            }
        }
    };

Cevap Kotlin'de, Java'da çalışacak. Kopyalayıp yapıştırırsanız IntelliJ bunu sizin için dönüştürmelidir.

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)
    }
})

Bu, LinearLayoutManageryukarıda kullanılan yöntemlerin aynısına sahip olduğu için de işe yarayacaktır . Yani findLastVisibleItemPosition()ve getItemCount()( itemCountKotlin'de).

Yukarıdaki cevaplardan mükemmel bir çözüm elde edemiyordum çünkü şu günlerde bile iki kez tetikliyordu 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")
        }

Bunu dene

Yukarıdaki cevapları kullandım, geri dönüşümcü görünümünün sonuna gittiğinizde her zaman çalışır,

Dipte olup olmadığını sadece bir kez kontrol etmek istersen? Örnek: - 10 öğelik bir listeye sahip olduğumda, en alta gittiğimde beni gösterecek ve yukarıdan aşağıya kaydırırsam bir daha yazdırılmayacak ve daha fazla liste eklerseniz ve oraya giderseniz tekrar görüntülenecektir.

Not: - API isabetinde ofset ile uğraşırken bu yöntemi kullanın

1. EndlessRecyclerViewScrollListener adlı bir sınıf oluşturun

       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. bu sınıfı böyle kullan

        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();
               }
           });
   

Sonumda mükemmel çalışıyor, herhangi bir sorunla karşılaşırsan bana haber ver

Benim uygulamam var, çok faydalı StaggeredGridLayout .

Kullanım:

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

rvMain.addOnScrollListener(scrollListener);

Dinleyici uygulaması:

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);
}  }

Ben de bu soruyu arıyordum ama beni tatmin eden cevabı bulamadım, bu yüzden recyclerView'ün kendi gerçekleştirimini yarattım.

diğer çözümler benimkinden daha az kesin. örneğin: son öğe oldukça büyükse (çok fazla metin), diğer çözümlerin geri araması çok daha erken gelecektir ve daha sonra recyclerView gerçekten dibe ulaşacaktır.

benim çözümüm bu sorunu çözdü.

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)
}

sonra faaliyet / bölümünüzde:

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

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

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

umarım birisi ;-)

Bu konudaki diğer cevapların çoğundan memnun kalmadıktan sonra, daha iyi olduğunu ve burada hiçbir yerde olmadığını düşündüğüm bir şey buldum.

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
        }
    }
});

Bu basittir ve yukarı veya aşağı kaydırdığınızda her koşulda tam olarak bir kez vurulacaktır.

Bu benim çözümüm:

    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
        }
    }
}

Pozisyon almak için Arayüzü kullanabiliriz

Arayüz: Dinleyici için bir Arayüz oluşturun

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

Aktivite :

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

Adaptör:

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