如何使用Android ListView setOnScrollListener？

Question

我正在尝试在列表末尾滚动时增加整数值。 如果我有5个数字并在列表视图中最后一项的末尾滚动，那我必须检查并向上滚动5次直到满足条件。

这是我的代码

listView.setOnScrollListener(new AbsListView.OnScrollListener()
            {
                @Override
                public void onScrollStateChanged(AbsListView view, int scrollState) {}

                @Override
                public void onScroll(AbsListView view, int firstVisibleItem,
                                     int visibleItemCount, int totalItemCount)
                {

                    lastInScreen = firstVisibleItem + visibleItemCount;
                    //Log.e("","lastInScreen="+lastInScreen);
                    if(lastInScreen == totalItemCount)
                    {
                        Toast.makeText(getApplicationContext(), "Your Last Item." + lastInScreen , Toast.LENGTH_SHORT).show();
                        if(num < 5)
                        {
                            num += 1;

                            Log.e("","num = "+num );
                        }
                        if(num  == 5)
                        {
                            Log.e(""," Stop Scrolling!!! ");
                        }
                    }
                }
            });

但是问题是，当我第一次滚动到listview项的末尾时， num会像for循环那样增加到5，而我不想这样做。 我想如果我滚动第一个num递增1，如果再次滚动， num递增2，因为最大可达5。

Answer 1

尝试保存“ firstVisibleitem”，如果相同，则不要求和。

int X=-1;
listView.setOnScrollListener(new AbsListView.OnScrollListener()
            {
                @Override
                public void onScrollStateChanged(AbsListView view, int scrollState) {}

                @Override
                public void onScroll(AbsListView view, int firstVisibleItem,
                                     int visibleItemCount, int totalItemCount)
                {
                    lastInScreen = firstVisibleItem + visibleItemCount;
                    //Compare X with the firstVisibleItem (if X is -1, it always go for false, if X is not -1 X will be the last first visible item
                    if(X!=firstVisibleItem)
                    {
                        if(lastInScreen == totalItemCount)
                        {
                            Toast.makeText(getApplicationContext(), "Your Last Item." + lastInScreen , Toast.LENGTH_SHORT).show();
                            if(num < 5)
                            {
                                num += 1;
                                Log.e("","num = "+num );
                            }
                            if(num  == 5)
                            {
                                Log.e(""," Stop Scrolling!!! ");
                            }
                        }
                    }
                    //Set the value of this firstVisibleItem to X
                    X=firstVisibleItem;
                }
            });