在滚动时检测Listview的最后一行-Android

Question

I want to load data in listview when it is displaying last row. I am writing scroll event for listview.

Now how to detect that listview is displaying last row?

Can anybody please help me?

Answer 1

        lv.setOnScrollListener(new OnScrollListener() {
        @Override
        public void onScroll(AbsListView view, int firstVisibleItem,
                int visibleItemCount, int totalItemCount) {
            // Check if the last view is visible
            if (++firstVisibleItem + visibleItemCount > totalItemCount) {

                // if so, download more content

                }
            }
        }

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

        }
    });

Answer 2

You may use Amazing ListView to have auto-loading of next pages (ie "Loading..." on the last item).

As per the documentation implement these methods:

• onNextPageRequested Called when user scrolls the list until the "loading" indicator is visible. This is called on UI thread, so if you have some network requests, make sure you do it on the background. The page number is also given.

By default, you are considered to be in the last page, and you will not see any "Loading..." message on the bottom of the list. You need to control whether there are still pages to be displayed.

• notifyMayHaveMorePages to indicate that we still have more data, hence "Loading..." message will be shown.
• notifyNoMorePages to indicate that we have loaded all the data, hence no more "Loading..." message to be shown.
• nextPage to increase the page number. Do this when you append new data into your adapter.
• resetPage to reset the page number to 1 (or to the value specified by setInitialPage ).

So what you need to do is fetch more data when onNextPageRequested is called. And call nextPage when you append new data into your adapter.

Answer 3

在列表视图中尝试此方法。

((ScrollView) findViewById(R.id.scrollDowns)).fullScroll(View.FOCUS_DOWN);

Answer 4

The above implementaion by slezadav may cause errors at edge conditions. The sum of first visible item & items in page may be 1 count more or less than expected. I was using the same thing untill i switched to a new method. What i did was put a listener to the Adapter of listview and in the getview check if(position== totalItemCount of items in array to be displayed), if yes i call up my listener from adapter and the listener will Pull more data from api. Quite simple