Question

我是Android新手。我的要求是加载额外的数据和当滚动到达底部时，设置为列表视图。我可以调用下一个数据，但我以前的数据是隐藏的。如何纠正这个？

 listView.setOnScrollListener(new OnScrollListener() {

                @Override
                public void onScrollStateChanged(AbsListView view,
                        int scrollState) {
                    // TODO Auto-generated method stub

                }

                @Override
                public void onScroll(AbsListView view,
                        int firstVisibleItem, int visibleItemCount,
                        int totalItemCount) {
                    // TODO Auto-generated method stub
                    if (listView.getLastVisiblePosition() == listView
                            .getAdapter().getCount() - 1
                            && listView.getChildAt(
                                    listView.getChildCount() - 1)
                                    .getBottom() <= listView
                                    .getHeight()) {
                        // scroll end reached

                        if (nextCall == null || nextCall == ""
                                || nextCall.equals("null")
                                || nextCall.equals("")) {

                        } else {

                            hostname=nextCall;

                            new ArticlesList().execute();

                        }

                        // Write your code here
                    }else{

                    }

                }
            });
            dialog.dismiss();
        } else {

            Toast.makeText(getActivity(), "Went wrong",
                    Toast.LENGTH_LONG).show();
            dialog.dismiss();
        }

Answer 1

访问此内容，描述如何在listview中进行分页。 PagingListView

Answer 2

在listView适配器中：

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) {

    if (position == items.size() - 1)
    {
        items.add("new data1");
        items.add("new data2");
        notificationDataSetChanged();
    }

    //inject your view here

}

您丢失了数据，因为您正在覆盖指向该数据的链接。您应该添加数据，而不是替换它。

Answer 3

你需要的是一个无尽的滚动听众，请看一下：https://github.com/codepath/android_guides/wiki/Endless-Scrolling-with-AdapterViews

只需将此项目添加到您的项目中并使用它：

yourListView.setOnScrollListener(new EndlessScrollListener() {
    @Override
    public void onLoadMore(int page, int totalItemsCount) {

        ... your asynchTask
    }

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

Answer 4

我使用以下代码段解决了同样的问题。

private int lastVisibleItem; private LinearLayoutManager linearLayoutManager; private int lastId; //首次从服务器加载数据后获取帖子的最后一个ID。 private int flag = 0;

linearLayoutManager = new LinearLayoutManager（getActivity（））;

recyclerView_news.setLayoutManager（linearLayoutManager）;

recyclerView_news.addOnScrollListener（new RecyclerView.OnScrollListener（）{

@Override
public void onScrollStateChanged(RecyclerView recyclerView, int    newState){
    super.onScrollStateChanged(recyclerView, newState);
}

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);
    lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();

    new Handler().post(new Runnable() {
        @Override
        public void run() {
            if (list_news.size() - 1 == lastVisibleItem) {
                if (flag == 0) {
                    flag = 1;
                    getMoreData(lastId); // pass lastId to load next posts. 
                }
            } else if (list_news.size() - 1 != lastVisibleItem) {
                flag = 0;
            }
        }
    });
}

}）; 希望这会有所帮助。感谢。

当Scroll到达底部时加载更多数据

4 个答案: