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!

Answer 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;
        }
    });

Answer 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() {...});