Java 如何使用多种类型的customViewHolder在recyclerView中实现recyclerView.smoothScrollToPosition（位置）？

我的recycleView有3种类型的视图支架

位置0是viewHolder1

位置1-41为视图保持架2

位置42是视图保持器3

但如果myDataSource.size（）的值超过42，它将创建viewHolder3

所以我需要让recyclerView.smoothScrollToPosition（位置）工作

请帮忙

这是我的LinearLayoutManagerWithSmoothScroller

public class LinearLayoutManagerWithSmoothScroller extends LinearLayoutManager {



public LinearLayoutManagerWithSmoothScroller(Context context) {
    super(context);
}

@Override
public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
    View firstVisibleChild = recyclerView.getChildAt(0);
    final int childHeight = firstVisibleChild.getHeight();

    int distanceInPixels = ((findFirstVisibleItemPosition() - position) * childHeight);
    if (distanceInPixels == 0) {
        distanceInPixels = (int) Math.abs(firstVisibleChild.getY());
    }




    SmoothScroller smoothScroller = new SmoothScroller(recyclerView.getContext(), Math.abs(distanceInPixels), 1000);
    smoothScroller.setTargetPosition(position);
    startSmoothScroll(smoothScroller);
}



private class SmoothScroller extends LinearSmoothScroller {
    private static final int TARGET_SEEK_SCROLL_DISTANCE_PX = 10000;
    private final float distanceInPixels;
    private final float duration;

    public SmoothScroller(Context context, int distanceInPixels, int duration) {
        super(context);
        this.distanceInPixels = distanceInPixels;
        float millisecondsPerPx = calculateSpeedPerPixel(context.getResources().getDisplayMetrics());
        this.duration = distanceInPixels < TARGET_SEEK_SCROLL_DISTANCE_PX ?
                (int) (Math.abs(distanceInPixels) * millisecondsPerPx) : duration;
    }

    @Override
    public PointF computeScrollVectorForPosition(int targetPosition) {
        return LinearLayoutManagerWithSmoothScroller.this
                .computeScrollVectorForPosition(targetPosition);
    }

    @Override
    protected int calculateTimeForScrolling(int dx) {
        float proportion = (float) dx / distanceInPixels;
        return (int) (duration * proportion);
    }
}

---

使用带有首选项的平滑滚动条

SNAP\u TO\u START

：

RecyclerView.SmoothScroller smoothScroller = new LinearSmoothScroller(context) {
  @Override protected int getVerticalSnapPreference() {
    return LinearSmoothScroller.SNAP_TO_START;
  }
};

现在设置要滚动到的位置：

smoothScroller.setTargetPosition(position);

并将该

平滑滚动条

传递给

布局管理器

：

layoutManager.startSmoothScroll(smoothScroller);

更新

从

onResponse

中删除这两行，并将它们添加到

onCreate

 recycleview.setAdapter(mAdapter);
 recycleview.setLayoutManager(new LinearLayoutManagerWithSmoothScroller(QuizGameRankingActivity.this));

---

反复设置适配器不是一种好的做法

为什么要使用自定义平滑滚动条，，而您已经可以使用默认的滚动条了。并且避免在回调后初始化适配器。使用空白arraylist在创建时对其进行初始化，然后将数据更新到适配器中，这将是一个良好的做法，否则适配器将在每个和每个api回调中进行初始化

此外，您还需要进行后期运行，以便在后期帧中平滑滚动，如

recyclerview.post(new Runnable() {
            @Override
            public void run() {
                 recycleview.smoothScrollToPosition(20);
            }
        });

---

您尚未提供所面临的任何错误。如果您想解决问题，请在问题中添加有关错误的信息。否则，语法已经很好了。我已经更新了我的帖子。你能给我看一下例子吗？你读过我下面的答案了吗？我已经试过了，但不起作用。我想是因为我有很多类型的customViewHolder

 recycleview.setAdapter(mAdapter);
 recycleview.setLayoutManager(new LinearLayoutManagerWithSmoothScroller(QuizGameRankingActivity.this));

recyclerview.post(new Runnable() {
            @Override
            public void run() {
                 recycleview.smoothScrollToPosition(20);
            }
        });