Android OnScrollListener

getListView().setOnScrollListener(onScrollListener);

 AbsListView.OnScrollListener onScrollListener = new AbsListView.OnScrollListener() {
        boolean flag = false;

        @Override
        public void onScrollStateChanged(AbsListView absListView, int scrollState) {
            if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {      //触屏滑动中
                if (flag) {
                    LinearLayout linearLayout = (LinearLayout) Checkin_context.findViewById(R.id.loadcheckin);
                    if (linearLayout.getVisibility() == View.GONE && linearLayout != null) {
                        linearLayout.setVisibility(View.VISIBLE);
                    }
                    getData(false);
                }

            }
        }

        @Override
        public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            Log.v(TAG,firstVisibleItem+","+visibleItemCount+","+totalItemCount+"|"+getListView().getFirstVisiblePosition()+","+getListView().getLastVisiblePosition());
            if (firstVisibleItem + visibleItemCount == totalItemCount && !flag) {
                flag = true;
            } else
                flag = false;
        }
    };

getListView().setOnScrollListener(onScrollListener);

 AbsListView.OnScrollListener onScrollListener = new AbsListView.OnScrollListener() {
        boolean flag = false;

        @Override
        public void onScrollStateChanged(AbsListView absListView, int scrollState) {
            if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {      //触屏滑动中
                if (flag) {
                    LinearLayout linearLayout = (LinearLayout) Checkin_context.findViewById(R.id.loadcheckin);
                    if (linearLayout.getVisibility() == View.GONE && linearLayout != null) {
                        linearLayout.setVisibility(View.VISIBLE);
                    }
                    getData(false);
                }

            }
        }

        @Override
        public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            Log.v(TAG,firstVisibleItem+","+visibleItemCount+","+totalItemCount+"|"+getListView().getFirstVisiblePosition()+","+getListView().getLastVisiblePosition());
            if (firstVisibleItem + visibleItemCount == totalItemCount && !flag) {
                flag = true;
            } else
                flag = false;
        }
    };

 因为我是直接extends ListActivity,在ListActivity中本身自带了一个Listview,所以可以直接getlistview

        唯一要讲的就是在 OnScroll中firstVisibleItem + visibleItemCount == totalItemCount

 firstVisibleItem :表示在屏幕中第一条显示的数据在adapter中的位置,visibleItemCount 则是屏幕中最后一条数据在adapter中的数据,totalItemCount则是adapter中的总条数!

      adapter(适配器)我们把其看做是一个list集合,可以在其中add很多的数据!而在屏幕中显示的数据,

 只是这个集合中的一部分!firstVisibleItem +visibleItemCount = 这个集合总条数(list.size())

   以此判断动态加载数据!