ScrollView嵌套RecyclerView A，RecyclerView A再嵌套RecyclerView B的问题解决

2017/12/7 产品和设计给了我一个这样的需求，如下图所示：

效果图

最终决定框架布局采用ViewPager+tabLayout，子页面中为防止日后图片数量的变化，布局使用ScrollView嵌套两层RecyclerView解决这个问题，这里就着重讲解一下ScrollView嵌套两层RecyclerView(顺便提一嘴，这里面用的Adapter全是BaseQucikAdapter，编译地址是compile 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.9')：
1.下图是第一层ScrollView嵌套RecyclerView的布局(其实毫无关键点)：

第一层布局

2.下图是第一层布局的初始化工作，ScrollView啥事都没做，RecyclerView设置了一个特殊的LayoutManager，方便解决滑动冲突问题：

第一层的实现

public class AutoLinearLayoutManager extends LinearLayoutManager {
private static final String TAG = AutoLinearLayoutManager.class.getSimpleName();

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

public AutoLinearLayoutManager(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++) {
        measureScrapChild(recycler, i,
                View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), mMeasuredDimension);
        if (getOrientation() == HORIZONTAL) {
            width = width + mMeasuredDimension[0];
            if (i == 0) {
                height = mMeasuredDimension[1];
            }
        } else {
            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) {
    try {
        View view = recycler.getViewForPosition(0);
        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);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
    }
}
}

3.第二层布局中，RecyclerView的父布局RelativeLayout是重点：

第二层布局

4.在第一层RecyclerView的Adapter中引用第二层布局，并且设置对应的Adapter，注意将RecyclerView和Adapter一块复用就好了：

第二层的实现

/***
 * 封装recycler基本属性
 * @param context
 * @param recyclerView
 * @param orientation listivew列表传1或者LinearLayoutManager.VERTICAL，grid列表传固定值
 */
public static RecyclerView.LayoutManager initRecyclerViewStyle(Context context, RecyclerView recyclerView, int orientation) {
    RecyclerView.LayoutManager layoutManager;
    /**提高性能*/
    recyclerView.setHasFixedSize(true);
    if (LinearLayoutManager.HORIZONTAL == orientation || LinearLayoutManager.VERTICAL == orientation) {
        /**listview*/
        layoutManager = new LinearLayoutManagerWrapper(context, orientation, false);
        ((LinearLayoutManager) layoutManager).setOrientation(orientation);
    } else {
        /**gridview**/
        layoutManager = new GridLayoutManager(context, orientation);
    }
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setNestedScrollingEnabled(false);
    return layoutManager;
}