滑动冲突的原因：

        子Recyclerview不会滑动是因为父Recyclerview消耗了点击事件。所以要解决该问题就让父Recyclerview将事件传递下来即可。

解决方案：

步骤1：自定义父Recyclerview的onInterceptTouchEvent()方法，让其不要拦截事件。

package 《包名》;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.RecyclerView;

import org.jetbrains.annotations.NotNull;

/**
 * 作者：${丁新辉} on
 * 邮箱：dingxinhui_vip@163.com
 * 备注：不拦截子recyclerview滑动事件，继续分发
 * <p>
 * # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #                                               #
 * #                       _oo0oo_                     #
 * #                      o8888888o                    #
 * #                      88" . "88                    #
 * #                      (| -_- |)                    #
 * #                      0\  =  /0                    #
 * #                    ___/`---'\___                  #
 * #                  .' \\|     |# '.                 #
 * #                 / \\|||  :  |||# \                #
 * #                / _||||| -:- |||||- \              #
 * #               |   | \\\  -  #/ |   |              #
 * #               | \_|  ''\---/''  |_/ |             #
 * #               \  .-\__  '-'  ___/-. /             #
 * #             ___'. .'  /--.--\  `. .'___           #
 * #          ."" '<  `.___\_<|>_/___.' >' "".         #
 * #         | | :  `- \`.;`\ _ /`;.`/ - ` : | |       #
 * #         \  \ `_.   \_ __\ /__ _/   .-` /  /       #
 * #     =====`-.____`.___ \_____/___.-`___.-'=====    #
 * #                       `=---='                     #
 * #     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   #
 * #                                                   #
 * #               佛祖保佑         永无BUG              #
 * # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
 */
public class ParentRecyclerView extends RecyclerView {


    public ParentRecyclerView(@NonNull @NotNull Context context) {
        super(context);
    }

    public ParentRecyclerView(@NonNull @NotNull Context context, @Nullable @org.jetbrains.annotations.Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public ParentRecyclerView(@NonNull @NotNull Context context, @Nullable @org.jetbrains.annotations.Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    //return false 不拦截，继续分发下去
    @Override
    public boolean onInterceptTouchEvent(MotionEvent e) {
        return false;
    }
}

步骤2：自定义子Recyclerview的dispatchTouchEvent()方法，通知通知父Recyclerview不要拦截点击事件。

package 《包名》;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.RecyclerView;

import org.jetbrains.annotations.NotNull;

/**
 * 作者：${丁新辉} on
 * 邮箱：dingxinhui_vip@163.com
 * 备注：通知父recyclerview不要拦截滑动事件
 * <p>
 * # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #                                               #
 * #                       _oo0oo_                     #
 * #                      o8888888o                    #
 * #                      88" . "88                    #
 * #                      (| -_- |)                    #
 * #                      0\  =  /0                    #
 * #                    ___/`---'\___                  #
 * #                  .' \\|     |# '.                 #
 * #                 / \\|||  :  |||# \                #
 * #                / _||||| -:- |||||- \              #
 * #               |   | \\\  -  #/ |   |              #
 * #               | \_|  ''\---/''  |_/ |             #
 * #               \  .-\__  '-'  ___/-. /             #
 * #             ___'. .'  /--.--\  `. .'___           #
 * #          ."" '<  `.___\_<|>_/___.' >' "".         #
 * #         | | :  `- \`.;`\ _ /`;.`/ - ` : | |       #
 * #         \  \ `_.   \_ __\ /__ _/   .-` /  /       #
 * #     =====`-.____`.___ \_____/___.-`___.-'=====    #
 * #                       `=---='                     #
 * #     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   #
 * #                                                   #
 * #               佛祖保佑         永无BUG              #
 * # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #
 */
public class ChildRecyclerview extends RecyclerView {
    public ChildRecyclerview(@NonNull @NotNull Context context) {
        super(context);
    }

    public ChildRecyclerview(@NonNull @NotNull Context context, @Nullable @org.jetbrains.annotations.Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public ChildRecyclerview(@NonNull @NotNull Context context, @Nullable @org.jetbrains.annotations.Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        //通知父层ViewGroup不要拦截点击事件
        getParent().requestDisallowInterceptTouchEvent(true);
        return super.dispatchTouchEvent(ev);
    }
}

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