NestedScrollView嵌套RecyclerView只显

方法一: 将NestedScrollView 替换为ScrollView即可

方法二: 重写NestedScrollView

第一步: 禁止RecyclerView的滑动

recyclerView.setNestedScrollingEnabled(false);

第二步: 重写NestedScrollView

public class RVNestedScrollView extends NestedScrollView {
    private int mDownX;
    private int mDownY;
    private int mTouchSlop;
 
    public RVNestedScrollView(Context context) {
        super(context);
        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }
 
    public RVNestedScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }
 
    public RVNestedScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
    }
 
    @Override
    public boolean onInterceptTouchEvent(MotionEvent e) {
        int action = e.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mDownX = (int) e.getRawX();
                mDownY = (int) e.getRawY();
                break;
            case MotionEvent.ACTION_MOVE:
                int moveY = (int) e.getRawY();
                if (Math.abs(moveY-mDownY) > mTouchSlop) {
                    return true;
                }
        }
        return super.onInterceptTouchEvent(e);
    }
}

第三步: 在布局文件RVNestedScrollView添加 android:fillViewport="true"属性.并将RecyclerView的layout_height属性和RecyclerView的item_layout最外层的容器layout_height都设置为wrap_content即可.