How to get the scroll speed on a ListView?

Question

I have a ListView with onScrollStateChanged and onScroll event listeners. I want to be able to get the scroll speed of the ListView or some way to get the finalX location of

Answer 1

Try it:

private class SpeedMeterOnScrollListener implements OnScrollListener {

    private long timeStamp;
    private int lastFirstVisibleItem;

    public SpeedMeterOnScrollListener() {
        timeStamp = System.currentTimeMillis();
        lastFirstVisibleItem = 0;
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        long lastTime = System.currentTimeMillis();
        //calculate speed by firstVisibleItem, lastFirstVisibleItem, timeStamp and lastTime
        timeStamp = lastTime;
        lastFirstVisibleItem = firstVisibleItem;
    }

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