Android(安卓)OnScrollListener

getListView().setOnScrollListener(onScrollListener);
AbsListView.OnScrollListeneronScrollListener=newAbsListView.OnScrollListener(){
booleanflag=false;
@Override
publicvoidonScrollStateChanged(AbsListViewabsListView,intscrollState){
if(scrollState==AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL){//触屏滑动中
if(flag){
LinearLayoutlinearLayout=(LinearLayout)Checkin_context.findViewById(R.id.loadcheckin);
if(linearLayout.getVisibility()==View.GONE&&linearLayout!=null){
linearLayout.setVisibility(View.VISIBLE);
}
getData(false);
}
}
}
@Override
publicvoidonScroll(AbsListViewabsListView,intfirstVisibleItem,intvisibleItemCount,inttotalItemCount){
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!

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