RecyclerView 点击选项让其滑动到中间

「爱情、让人受尽委屈。」 2022-05-21 00:43 205阅读 0赞

首先上图

![这里写图片描述][70]

改写SmoothScroller计算距离，达到smooth滑动到指定位置的效果，解决指定位置可见就不滑动的问题

自定义LayoutManager

public class CenterLayoutManager extends LinearLayoutManager { 
    
        public CenterLayoutManager(Context context) {
            super(context);
        }
    
        public CenterLayoutManager(Context context, int orientation, boolean reverseLayout) {
            super(context, orientation, reverseLayout);
        }
    
        public CenterLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
            super(context, attrs, defStyleAttr, defStyleRes);
        }
    
        @Override
        public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
            RecyclerView.SmoothScroller smoothScroller = new CenterSmoothScroller(recyclerView.getContext());
            smoothScroller.setTargetPosition(position);
            startSmoothScroll(smoothScroller);
        }
    
        private static class CenterSmoothScroller extends LinearSmoothScroller { 
    
            CenterSmoothScroller(Context context) {
                super(context);
            }
    
            @Override
            public int calculateDtToFit(int viewStart, int viewEnd, int boxStart, int boxEnd, int snapPreference) {
                return (boxStart + (boxEnd - boxStart) / 2) - (viewStart + (viewEnd - viewStart) / 2);
            }
        }
    }

使用Manager 时就是使用自定义的Manager 就可以效果如上图。

[70]: /images/20220521/1ed09fc3e5f1427abb156b9b8e47ad0a.png