android - How to know how many elements user has viewd/scrolled in my listView

Question

I have a requirement that I need to display a custom ListView with 'N' elements(Size of ListView may vary). I need to display how many elements user has viewed/ scrolled from my Listview...

My requirement is to I nned to display user that how many List items user not viewed yet..

Please let me know how get the count of elemnts...

Answer 1

// class members
private TextView textView;
private in maxViewed = 0;

// in your onCreate method   
// find pointer to where you are displaying to user how many items he's viewed
textView = (TextView)findViewById(R.id.textView); // make sure to make this item in your layout

// make the scroll listener for the listview
listView.setOnScrollListener(new OnScrollListener(){

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

    public void onScrollStateChanged(AbsListView view, int scrollState) {   
        // keep track of how many items we've viewed         
        maxViewed = Math.max(maxViewed, listView.getLastVisiblePosition());
        textView.setText(String.valueOf(maxViewed));
    }

});

Answer 2

您可以使用listView.getLastVisiblePosition()，它会告诉您在您的最底部可见项目的位置ListView。