您不需要扩展ScrollView并根据David Daudelin为this question提供的答案创建自己的ScrollView。
获取ScrollView的ViewTreeObserver，并将OnGlobalLayoutListener添加到ViewTreeObserver。然后从OnGlobalLayoutListener的onGlobalLayout()方法调用ScrollView.scrollTo(x,y)方法。代码：

ScrollView mainScroll = (ScrollView) findViewById(R.id.average_scroll_mainScroll);

 ViewTreeObserver vto = scrollView.getViewTreeObserver();
 vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
      public void onGlobalLayout() {
           mainScroll.scrollTo(0, 0);
      }
 });

这对我很有效，将scrollView.scrollTo()替换为

scrollView.post(new Runnable() {
        @Override
        public void run() {
            scrollView.scrollTo(0, ScrollViewYPosition);//0 is x position
        }
    });

瓦西里·卡布诺夫的回答帮助了我。
ScrollView .scrollTo not working? Saving ScrollView position on rotation

当您对ScrollView进行某些更改时，它需要一段时间才能将布局更改复制到显示列表，并通知ScrollView它确实可以滚动到某个位置。
我已经设法让它工作，用我自己的ScrollView扩展ScrollView，并添加一个方法，根据需要添加OnGlobalLayoutListener（如MH所建议的）并在稍后滚动。这比将其应用于您需要的每个案例更加自动化（但是您需要使用新的ScrollView）。这是一个简单的例子。

public class ZScrollView extends ScrollView {

    // Properties
    private int desiredScrollX = -1;
    private int desiredScrollY = -1;
    private OnGlobalLayoutListener gol;

    // ================================================================================================================
    // CONSTRUCTOR ----------------------------------------------------------------------------------------------------

    public ZScrollView(Context __context) {
        super(__context);
    }

    public ZScrollView(Context __context, AttributeSet __attrs) {
        super(__context, __attrs);
    }

    public ZScrollView(Context __context, AttributeSet __attrs, int __defStyle) {
        super(__context, __attrs, __defStyle);
    }

    // ================================================================================================================
    // PUBLIC INTERFACE -----------------------------------------------------------------------------------------------

    public void scrollToWithGuarantees(int __x, int __y) {
        // REALLY Scrolls to a position
        // When adding items to a scrollView, you can't immediately scroll to it - it takes a while
        // for the new addition to cycle back and update the scrollView's max scroll... so we have
        // to wait and re-set as necessary

        scrollTo(__x, __y);

        desiredScrollX = -1;
        desiredScrollY = -1;

        if (getScrollX() != __x || getScrollY() != __y) {
            // Didn't scroll properly: will create an event to try scrolling again later

            if (getScrollX() != __x) desiredScrollX = __x;
            if (getScrollY() != __y) desiredScrollY = __y;

            if (gol == null) {
                gol = new OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        int nx = desiredScrollX == -1 ? getScrollX() : desiredScrollX;
                        int ny = desiredScrollY == -1 ? getScrollY() : desiredScrollY;
                        desiredScrollX = -1;
                        desiredScrollY = -1;
                        scrollTo(nx, ny);
                    }
                };

                getViewTreeObserver().addOnGlobalLayoutListener(gol);
            }
        }
    }
}

对我来说非常有用，因为我想在添加后立即滚动到ScrollView中的给定View。

试试这个它的工作原理：（Kotlin）

myScrollView.post(Runnable {
                 myScrollView.scrollTo(0, scrollValue)
             })

下面是滚动recycleView的示例：

private int scrollPosition = 0;
@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.home_activity);
    ...
    // set scrollPosition value
    recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            scrollPosition += dy;
        }
    });
    ...
}      

@Override
protected void onResume() {
    super.onResume();
    ...
    // scrollToPosition recycleView
    recyclerView.post(() -> {
        recyclerView.scrollToPosition(scrollPosition);//0 is x position
    });
}

// Save the scroll position when the activity is paused (e.g., when navigating away)
@Override
protected void onPause() {
    super.onPause();
    scrollPosition = getCurrentScrollPosition();
}

private int getCurrentScrollPosition() {
    LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    if (layoutManager != null) {
        return layoutManager.findLastVisibleItemPosition();
    }
    return 0;
}