Question

我正在学习Android并尝试为记录的ListView实现分页（或无限滚动）。

我正在使用ListView的setOnScrollListener读取列表向下滚动并记录结束，这样我就可以对我的服务器进行API调用并获取下一组数据。

当列表一直向下滚动并且一直向上（因此可以获取下一个/上一组数据）时，我仍然试图弄清楚如何读取数据的结尾

accountList.setOnScrollListener(new AbsListView.OnScrollListener() {
     @Override
     public void onScrollStateChanged(AbsListView absListView, int i) {

     }

     @Override
     public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
           Log.i("SCROLL", "-----firstVisibleItem: " + firstVisibleItem + " | visibleItemCount: " + visibleItemCount + " | totalItemCount: " + totalItemCount + " | pageIndex: " + pageIndex);

           if((firstVisibleItem + visibleItemCount >= totalItemCount) && totalItemCount > 0) {
              Log.i("SCROLL", "-------- we have reached at the bottom of the scroll list");
              pageIndex = pageIndex + pageSize;
              getAllAccountsRecords();
           } else if(firstVisibleItem == 0 && visibleItemCount > 0 && totalItemCount > 0 && pageIndex > 0) {
              Log.i("SCROLL", "-------- we have reached at the top of the scroll list");
              pageIndex = pageIndex - pageSize;
              if(pageIndex >= 0) {
                getAllAccountsRecords();
              }
           }
     }
 });

getAllAccountsRecords调用AsyncTask并执行API调用以重新填充listview。

public void getAllAccountsRecords() {
        new GetAccounts().execute();
    }

然而，无论何时我一直向下滚动到初始数据集，它都会进入一个疯狂的循环并开始递增来自0＆gt;的pageIndex值。 10> 20> 30> 40 ......等等

以下是调试日志

I: -----firstVisibleItem: 3 | visibleItemCount: 5 | totalItemCount: 10 | pageIndex: 0
I: -----firstVisibleItem: 3 | visibleItemCount: 5 | totalItemCount: 10 | pageIndex: 0
I: -----firstVisibleItem: 3 | visibleItemCount: 5 | totalItemCount: 10 | pageIndex: 0
I: -----firstVisibleItem: 3 | visibleItemCount: 6 | totalItemCount: 10 | pageIndex: 0
I: -----firstVisibleItem: 3 | visibleItemCount: 6 | totalItemCount: 10 | pageIndex: 0
I: -----firstVisibleItem: 3 | visibleItemCount: 6 | totalItemCount: 10 | pageIndex: 0
I: -----firstVisibleItem: 4 | visibleItemCount: 6 | totalItemCount: 10 | pageIndex: 0
I: -------- we have reached at the bottom of the scroll list
I: -----firstVisibleItem: 4 | visibleItemCount: 6 | totalItemCount: 10 | pageIndex: 10
I: -------- we have reached at the bottom of the scroll list
I: -----firstVisibleItem: 4 | visibleItemCount: 6 | totalItemCount: 10 | pageIndex: 20
I: -------- we have reached at the bottom of the scroll list
I: -----firstVisibleItem: 4 | visibleItemCount: 6 | totalItemCount: 10 | pageIndex: 30
I: -------- we have reached at the bottom of the scroll list
I: -----firstVisibleItem: 0 | visibleItemCount: 6 | totalItemCount: 10 | pageIndex: 40
I: -----firstVisibleItem: 0 | visibleItemCount: 0 | totalItemCount: 0 | pageIndex: 40
I: -----firstVisibleItem: 0 | visibleItemCount: 0 | totalItemCount: 0 | pageIndex: 40
I: -----firstVisibleItem: 0 | visibleItemCount: 0 | totalItemCount: 0 | pageIndex: 40

因此它永远不会将firstVisibleItem初始化为0，因此pageIndex会不断增加。

我看过许多无限滚动解决方案，但它们都是从静态来源获取数据而对我不起作用，所以我不得不想出自己的

任何帮助解决这个问题或让它变得更好的人都会受到赞赏。

感谢。

Android：在listview中加载新数据时将滚动位置重置为顶部

0 个答案: