Java Android smoothScrollToPosition不'；我不能正常工作

我正在使用此功能滚动到水平回收视图中的选定位置。问题是，如果我滚动回收器，然后单击一个项目，它不会进入视图的中心。相反，如果我不滚动回收器，它会工作。 我在单击某个项目时使用此方法。该位置是适配器位置

override fun scrollToSelected(position: Int, isLeftScroll: Boolean) {
if(!isLeftScroll || position == 0) contactRV.layoutManager?.smoothScrollToPosition(contactRV, RecyclerView.State(), position +1)
    else contactRV.layoutManager?.smoothScrollToPosition(contactRV, RecyclerView.State(), position-1)

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我该怎么解决这个问题

您将通过实现

RecyclerView.SmoothScroller

的方法

onTargetFound（视图、状态、操作）

来实现

特别是在带有

linearslayoutmanager

线性平滑滚动条的

linearslayoutmanager中：

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);
        }
    }
}

您将通过实现
RecyclerView.SmoothScroller
的方法
onTargetFound（视图、状态、操作）
来实现

特别是在带有
linearslayoutmanager
线性平滑滚动条的
linearslayoutmanager中：

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);
        }
    }
}

调用smoothScrollToPosition方法时，如何获取recyclerview的状态？只需调用recyclerview.smoothScrollToPosition（position）；不要忘记设置布局管理器recyclerView.setLayoutManager（layoutManager）；调用smoothScrollToPosition方法时，如何获取recyclerview的状态？只需调用recyclerview.smoothScrollToPosition（position）；不要忘记设置布局管理器recyclerView.setLayoutManager（layoutManager）；