How to detect if a listview is scrolling up or down in android?

Question

Is there a way to identify if listview is being scroll up or down?

OnScrollListener doens't help me in this case.

Thanks in advance!

Solution 1

this is a simple implementation:

lv.setOnScrollListener(new OnScrollListener() {

        private int mLastFirstVisibleItem;

        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState){}

        @Override
        public void onScroll(AbsListView view, int firstVisibleItem,
                int visibleItemCount, int totalItemCount) {

            if(mLastFirstVisibleItem < firstVisibleItem){
                // Scrolling down
            }
            if(mLastFirstVisibleItem > firstVisibleItem){
                // scrolling up
            }
            mLastFirstVisibleItem = firstVisibleItem;
        }
    });

Solution 2

There is a method in ScrollViews that reports the shifting of scrolls. It is called onScrollChanged(). However, it is declared protected, so you must create a wrapper class to gain access. For the usage of the method, please check android docs.

First, create an interface to expose the protected method

public interface OnScrollListener {
void onScrollChanged(int x, int y, int oldx, int oldy);
}

Then, create your wrapper and extend ScrollView

public class ReportingScrollView extends ScrollView {
private OnScrollListener onScrollListener = null;

public ReportingScrollView(Context context) {
    super(context);
}

public ReportingScrollView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

public ReportingScrollView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public void setOnScrollListener(OnScrollListener onScrollListener) {
    this.onScrollListener = onScrollListener;
}

@Override
protected void onScrollChanged(int x, int y, int oldx, int oldy) {
    super.onScrollChanged(x, y, oldx, oldy);
    if (onScrollListener != null) {
        onScrollListener.onScrollChanged(x, y, oldx, oldy);
    }
}
}

Finally, include it in your XML layout like a custom view, and attach listeners like usual.

<your.package.ReportingScrollView />

scrollingandtrolling.setOnScrollListener(new OnScrollListener() {...});

Solution 3

for whom ever still looking for an answer for kotlin, this works for it

MainListView.setOnScrollListener(object :AbsListView.OnScrollListener {
     // var VisibleItem: Int = 0
      override fun onScroll(p0: AbsListView?, FirstVisibleItem: Int, i2: Int, i3: Int) {
      /*   
      if(VisibleItem < FirstVisibleItem)
      {
      Toast.makeText(applicationContext,"Scrolling Down",Toast.LENGTH_SHORT).show()
          fab.hide()
      }
      if(VisibleItem >FirstVisibleItem)
      {
          fab.show()
          Toast.makeText(applicationContext,"Scrolling Up",Toast.LENGTH_SHORT).show()
      }
          VisibleItem=FirstVisibleItem;
  */
      }
      override fun onScrollStateChanged(p0: AbsListView?, p1: Int) {
          if (p1 == 1) {
              fab.hide()
          } else {
              fab.show()
          }
      }

  })
}

Uncomment to use an alternative method.

Solution 4

An easy and working solution.

private int lastPosition = -1;

        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
        {
            if(lastPosition == firstVisibleItem)
            {
                return;
            }

            if(firstVisibleItem > lastPosition)
            {
                Logger.print("Going Down");
            }
            else
            {
                Logger.print("Going Up");
            }

            lastPosition = firstVisibleItem;
        }

View more solutions

Comments

[Christopher Perry]

This only seems to be called when you fling the list, it's not repeatedly called.

[Johann]

Only useful once the top item is no longer the first item. Won't tell you direction if you scroll back and forth while the same item remains at the top.

[Vahid Najafi]

This doesn't work perfect when the item has a large height.

[Noor Hossain]

@VahidNajafi so, what is the approach, When the list view larger as well as the items are large heights ?