How to know whether a RecyclerView / LinearLayoutManager is scrolled to top or bottom?

Question

Currently I am using the follow code to check whether SwipeRefreshLayout should be enabled.

private void laySwipeToggle() {
    if (mRecyclerView.getChildCou         


        

Answer 1

Use recyclerView.canScrollVertically(int direction) to check if top or bottom of the scroll reached.

direction = 1 for scroll down (bottom)

direction = -1 for scroll up (top)

if method return false that means you reached either top or bottom depends on the direction.

Answer 2

you can try with the OnTouchListener:

recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        if (e.getAction() == MotionEvent.ACTION_UP
            || e.getAction() == MotionEvent.ACTION_MOVE){
        if (mLinearLayoutManager.findFirstCompletelyVisibleItemPosition() > 0)
        {
        // beginning of the recycler 
        }

        if (mLinearLayoutManager.findLastCompletelyVisibleItemPosition()+1 < recyclerView.getAdapter().getItemCount())
        {
        // end of the recycler 
        }         
     }             
return false;
}

Answer 3

The solution is in the layout manager.

LinearLayoutManager layoutManager = new LinearLayoutManager(this);

// Add this to your Recycler view
recyclerView.setLayoutManager(layoutManager);

// To check if at the top of recycler view
if(layoutManager.firstCompletelyVisibleItemPosition()==0){
    // Its at top
}

// To check if at the bottom of recycler view
if(layoutManager.lastCompletelyVisibleItemPosition()==data.size()-1){
    // Its at bottom
}

EDIT

In case your item size is larger than the screen use the following to detect the top event.

RecyclerView recyclerView = (RecyclerView) view;
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();

int pos = linearLayoutManager.findFirstVisibleItemPosition();

if(linearLayoutManager.findViewByPosition(pos).getTop()==0 && pos==0){
    return true;
}

PS: Actually, if you place the RecyclerView directly inside the SwipeRefreshview you wouldn't need to do this

Answer 4

I have written a RecyclerViewHelper to know the recyclerview is at top or at bottom.

public class RecyclerViewHelper {
public static boolean isAtTop(RecyclerView recyclerView) {
    if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        return isAtTopBeforeIceCream(recyclerView);
    } else {
        return !ViewCompat.canScrollVertically(recyclerView, -1);
    }
}

private static boolean isAtTopBeforeIceCream(RecyclerView recyclerView) {
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        int pos = linearLayoutManager.findFirstVisibleItemPosition();
        if (linearLayoutManager.findViewByPosition(pos).getTop() == recyclerView.getPaddingTop() && pos == 0)
            return true;
    }
    return false;
}


public static boolean isAtBottom(RecyclerView recyclerView) {
    if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        return isAtBottomBeforeIceCream(recyclerView);
    } else {
        return !ViewCompat.canScrollVertically(recyclerView, 1);
    }
}

private static boolean isAtBottomBeforeIceCream(RecyclerView recyclerView) {
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
    int count = recyclerView.getAdapter().getItemCount();
    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        int pos = linearLayoutManager.findLastVisibleItemPosition();
        int lastChildBottom = linearLayoutManager.findViewByPosition(pos).getBottom();
        if (lastChildBottom == recyclerView.getHeight() - recyclerView.getPaddingBottom() && pos == count - 1)
            return true;
    }
    return false;
}

}

Answer 5

Just keep a reference to your layoutManager and set onScrollListener on your recycler view like this

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();
        firstVisibleItemIndex = mLayoutManager.findFirstVisibleItemPosition();

        //synchronizew loading state when item count changes
        if (loading) {
            if (totalItemCount > previousTotal) {
                loading = false;
                previousTotal = totalItemCount;
            }
        }
        if (!loading)
            if ((totalItemCount - visibleItemCount) <= firstVisibleItemIndex) {
                // Loading NOT in progress and end of list has been reached
                // also triggered if not enough items to fill the screen
                // if you start loading
                loading = true;
            } else if (firstVisibleItemIndex == 0){
                // top of list reached
                // if you start loading
                loading = true;
            }
        }
    }
});