CODEWITHSUNDEEP
androidandroid-nestedscrollview
Amay Diam
Amay Diam

Reputation: 2591

how to detect the position of the scroll nestedscrollview android at the bottom?

i just want to detect the position of the scroll nestedscrollview android at the bottom, and the to call function. my code is :

scroll.getViewTreeObserver()
      .addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
           @Override
           public void onScrollChanged() {
               int totalHeight = scroll.getChildAt(0).getHeight();
               int scrollY = scroll.getScrollY();
               Log.v("position", "totalHeight=" + totalHeight + "scrollY=" + scrollY);
               if (scrollY==totalHeight) {
                   getPlaylistFromServer("more");
               }
           }
      });

but totalheight not same wit MAX ScrollY. how to fix it ?

Upvotes: 48

Views: 76561

Answers (9)

NimaAzhd
NimaAzhd

Reputation: 192

I just changed a little codes of first answer to detect reaching end of recyclerview inside nested scrollview.

binding.nestedScroll.setOnScrollChangeListener(object:NestedScrollView.OnScrollChangeListener {
        override fun onScrollChange(
            v: NestedScrollView,
            scrollX: Int,
            scrollY: Int,
            oldScrollX: Int,
            oldScrollY: Int
        ) {

        if (scrollY > oldScrollY) {
            Log.i("TAG", "Scroll DOWN");
        }
        if (scrollY < oldScrollY) {
            Log.i("TAG", "Scroll UP");
        }

        if (scrollY == 0) {
            Log.i("TAG", "TOP SCROLL");
        }
       
        if (v.getChildAt(0).getBottom() <= v.height + scrollY)
            {
            Log.i("TAG", "BOTTOM SCROLL IN Recyclerview.");

            Toast.makeText(requireContext(), "Last", Toast.LENGTH_LONG).show()
        }

        }
    })

Upvotes: 1

MUHINDO
MUHINDO

Reputation: 1213

This worked for me!

            my_scroll_view.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {



                    if (scrollY == v.getChildAt(0).getMeasuredHeight() - v.getMeasuredHeight()) {
                        Log.d(TAG, "onScrollChange: SRCOLLED ==> scrollY: ======================================> THIS IS THE VERY END ");
                    }

                

            }
        });

Upvotes: 0

Mrudul Tora
Mrudul Tora

Reputation: 753

This worked for me :

nestedScroll.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
        @Override
        public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {

            if (v.getChildAt(0).getBottom()<=(nestedScroll.getHeight()+scrollY)) {
                System.out.println("End of NestedScrollView");
            }

        }
    });

Basically , we add many views inside a nestedScrollView but wrap them together in a form of Single View. Therefore, childCount will always be 1 with its index 0. Thus, used v.getChildAt(0).getBottom() to determine its bottom. Now, nestedScroll.getHeight() returns height in pixel,and , scrollY will return current vertical origin. Therefore, the above condition will be true everytime the bottom of NestedScrollView is reached.

if (v.getChildAt(0).getBottom()==(nestedScroll.getHeight()+nestedScroll.getScrollY()))

This only works some time... therefore, don't use it in such way.

Upvotes: 5

sandeep dhami
sandeep dhami

Reputation: 188

Webserveis answered right, but the condition should be like this

 if (scrollY == (v?.getChildAt(0)?.measuredHeight ?: 0) - (v?.measuredHeight ?: 0)) {
    //at bottom
    }

Upvotes: 0

martinseal1987
martinseal1987

Reputation: 2419

for api <23 you can add a treeObserver.scrollChangeLister store a local float variable and check which way your scrolling like this

example

public class About extends AppCompatActivity implements 
ViewTreeObserver.OnScrollChangedListener{

private float viewScrolled = 0;

   nestedScrollView.getViewTreeObserver().addOnScrollChangedListener(this);

}

@Override
public void onScrollChanged() {

    if (viewScrolled < nestedScrollView.getScrollY()){
        viewScrolled = nestedScrollView.getScrollY();
        Log.d(TAG, "scrolling up");
    }
    if (viewScrolled > nestedScrollView.getScrollY()){
        viewScrolled = nestedScrollView.getScrollY();
        Log.d(TAG, "scrolling down");
    }
}

Upvotes: 0

Wai Yan
Wai Yan

Reputation: 139

Webserveis answered right, but it needs a little bit of changes in onScrollChange (override method), like this:

if (scrollY === v.getChildAt(0).getMeasuredHeight() - v.getMeasuredHeight()) {
   // end of the scroll view
}

Kotlin:

if (scrollY == v.getChildAt(0).measuredHeight - v.measuredHeight) {
    // end of the scroll view
}

Upvotes: 10

Codelaby
Codelaby

Reputation: 2873

Set setOnScrollChangeListener in a NestedScrollView params to get

  • NestedScrollView v (parent with scroll)
  • int scrollY
  • int oldScrollY

To detect whether the offset is at the bottom, it is necessary to obtain the value of content height v.getChildAt(0).getMeasuredHeight() and compare the current scroll over the height of the parent, if you have the same value , it means that it has reached the end.

You can get the height with parent view with v.getMeasuredHeight()

NestedScrollView scroller = (NestedScrollView) findViewById(R.id.myScroll);

if (scroller != null) {

    scroller.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
        @Override
        public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {

            if (scrollY > oldScrollY) {
                Log.i(TAG, "Scroll DOWN");
            }
            if (scrollY < oldScrollY) {
                Log.i(TAG, "Scroll UP");
            }

            if (scrollY == 0) {
                Log.i(TAG, "TOP SCROLL");
            }

           if (scrollY == ( v.getMeasuredHeight() - v.getChildAt(0).getMeasuredHeight() )) {
               Log.i(TAG, "BOTTOM SCROLL");
           }
       }
    });
}

Upvotes: 121

vishnu t satheesh
vishnu t satheesh

Reputation: 73

  @Override
public void onScrollChange(NestedScrollView nestedScrollView, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
    if (nestedScrollView.getChildAt(nestedScrollView.getChildCount() - 1) != null) {
        if ((scrollY >= (nestedScrollView.getChildAt(nestedScrollView.getChildCount() - 1).getMeasuredHeight() - nestedScrollView.getMeasuredHeight())) &&
                scrollY > oldScrollY) {
            LogsUtils.INSTANCE.makeLogD(">onScrollChange>", ">>BOTTOm");
        }

    }
}

Its worked for me, Source

Upvotes: 6

V-rund Puro-hit
V-rund Puro-hit

Reputation: 5534

I know it's late but.. try this way.

scroll.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
    @Override
    public void onScrollChanged() {
            View view = (View) scroll.getChildAt(scroll.getChildCount() - 1);

            int diff = (view.getBottom() - (scroll.getHeight() + scroll
                    .getScrollY()));

            if (diff == 0) {
                getPlaylistFromServer("more");
            }          
    }
});

Happy Coding..

Upvotes: 46

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