另一种解决这个问题的方法是在ScrollView中使用ConstraintLayout:

<ScrollView>
  <ConstraintLayout> (this is the only child of ScrollView)
    <...Some Views...>
    <RecyclerView> (layout_height=wrap_content)
    <...Some Other Views...>

但我仍然会坚持使用杨培勇提出的androidx.core.widget.NestedScrollView方法。

将这一行添加到您的RecyclerView xml视图中:

android:nestedScrollingEnabled="false"

和您的RecyclerView将顺利滚动灵活的高度。

希望能有所帮助。

另一种解决这个问题的方法是在ScrollView中使用ConstraintLayout:

<ScrollView>
  <ConstraintLayout> (this is the only child of ScrollView)
    <...Some Views...>
    <RecyclerView> (layout_height=wrap_content)
    <...Some Other Views...>

但我仍然会坚持使用杨培勇提出的androidx.core.widget.NestedScrollView方法。

如果RecyclerView只显示ScrollView中的一行。你只需要设置你的行高度android:layout_height="wrap_content"。

你也可以重写LinearLayoutManager来让RecyclerView平滑滚动:

@Override
public boolean canScrollVertically(){
    return false;
}

首先，你应该使用NestedScrollView而不是ScrollView，并把RecyclerView放在NestedScrollView里面。

使用自定义布局类测量屏幕的高度和宽度:

public class CustomLinearLayoutManager extends LinearLayoutManager {

public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
    super(context, orientation, reverseLayout);
}

private int[] mMeasuredDimension = new int[2];

@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
                      int widthSpec, int heightSpec) {
    final int widthMode = View.MeasureSpec.getMode(widthSpec);
    final int heightMode = View.MeasureSpec.getMode(heightSpec);
    final int widthSize = View.MeasureSpec.getSize(widthSpec);
    final int heightSize = View.MeasureSpec.getSize(heightSpec);
    int width = 0;
    int height = 0;
    for (int i = 0; i < getItemCount(); i++) {
        if (getOrientation() == HORIZONTAL) {
            measureScrapChild(recycler, i,
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    heightSpec,
                    mMeasuredDimension);

            width = width + mMeasuredDimension[0];
            if (i == 0) {
                height = mMeasuredDimension[1];
            }
        } else {
            measureScrapChild(recycler, i,
                    widthSpec,
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    mMeasuredDimension);
            height = height + mMeasuredDimension[1];
            if (i == 0) {
                width = mMeasuredDimension[0];
            }
        }
    }
    switch (widthMode) {
        case View.MeasureSpec.EXACTLY:
            width = widthSize;
        case View.MeasureSpec.AT_MOST:
        case View.MeasureSpec.UNSPECIFIED:
    }

    switch (heightMode) {
        case View.MeasureSpec.EXACTLY:
            height = heightSize;
        case View.MeasureSpec.AT_MOST:
        case View.MeasureSpec.UNSPECIFIED:
    }

    setMeasuredDimension(width, height);
}

private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                               int heightSpec, int[] measuredDimension) {
    View view = recycler.getViewForPosition(position);
    recycler.bindViewToPosition(view, position);
    if (view != null) {
        RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
        int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
                getPaddingLeft() + getPaddingRight(), p.width);
        int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
                getPaddingTop() + getPaddingBottom(), p.height);
        view.measure(childWidthSpec, childHeightSpec);
        measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
        measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
        recycler.recycleView(view);
    }
}
}

并在RecyclerView的活动/片段中实现以下代码:

 final CustomLinearLayoutManager layoutManager = new CustomLinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);

    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setAdapter(mAdapter);

    recyclerView.setNestedScrollingEnabled(false); // Disables scrolling for RecyclerView, CustomLinearLayoutManager used instead of MyLinearLayoutManager
    recyclerView.setHasFixedSize(false);

    recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);

            int visibleItemCount = layoutManager.getChildCount();
            int totalItemCount = layoutManager.getItemCount();
            int lastVisibleItemPos = layoutManager.findLastVisibleItemPosition();
            Log.i("getChildCount", String.valueOf(visibleItemCount));
            Log.i("getItemCount", String.valueOf(totalItemCount));
            Log.i("lastVisibleItemPos", String.valueOf(lastVisibleItemPos));
            if ((visibleItemCount + lastVisibleItemPos) >= totalItemCount) {
                Log.i("LOG", "Last Item Reached!");
            }
        }
    });