ListView与RecyclerView的滑动监听

最新推荐文章于 2022-04-22 17:10:42 发布

原创最新推荐文章于 2022-04-22 17:10:42 发布 · 850 阅读

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#listviwe #recyclerView

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本文详细介绍了在Android应用中如何使用ListView和RecyclerView的滚动监听器。通过对onScroll和onScrollStateChanged方法的重写，可以实现当列表滚动到顶部或底部时的逻辑处理，如加载更多数据或显示提示信息。

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ListView

mListView.setOnScrollListener(new OnScrollListener() {
            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                if (firstVisibleItem == 0) {
                    View firstVisibleItemView = mListView.getChildAt(0);
                    if (firstVisibleItemView != null && firstVisibleItemView.getTop() == 0) {
                        Log.d("ListView", "滚动到顶部");
                    }
                } else if ((firstVisibleItem + visibleItemCount) == totalItemCount) {
                    View lastVisibleItemView = mListView.getChildAt(mListView.getChildCount() - 1);
                    if (lastVisibleItemView != null && lastVisibleItemView.getBottom() == mListView.getHeight()) {
                        Log.d("ListView", " 滚动到底部");       
                    }
                }
            }
 
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                //do nothing
            }
            
        })

RecyclerView

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
                @Override
                public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                    //当前RecyclerView显示出来的最后一个的item的position
                    int lastPosition = -1;
                    //当前状态为停止滑动状态SCROLL_STATE_IDLE时
                    if(newState == RecyclerView.SCROLL_STATE_IDLE){
                        RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
                        if(layoutManager instanceof GridLayoutManager){
                            //通过LayoutManager找到当前显示的最后的item的position
                            lastPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
                        }else if(layoutManager instanceof LinearLayoutManager){
                            lastPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
                        }else if(layoutManager instanceof StaggeredGridLayoutManager){
                            //因为StaggeredGridLayoutManager的特殊性可能导致最后显示的item存在多个，所以这里取到的是一个数组
                            //得到这个数组后再取到数组中position值最大的那个就是最后显示的position值了
                            int[] lastPositions = new int[((StaggeredGridLayoutManager) layoutManager).getSpanCount()];
                            ((StaggeredGridLayoutManager) layoutManager).findLastVisibleItemPositions(lastPositions);
                            lastPosition = findMax(lastPositions);
                        }
                        //时判断界面显示的最后item的position是否等于itemCount总数-1也就是最后一个item的position
                        //如果相等则说明已经滑动到最后了
                        if(lastPosition == recyclerView.getLayoutManager().getItemCount()-1){
                            showToast("mRecyclerView  滑动到底了");
                        }
                    }
                }
                @Override
                public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                }
            });