Android RecycleView嵌套RecycleView 高度不對問題

在使用RecycleView嵌套RecycleView時，可能會發生子RecycleView高度顯示不對問題。

注意修改下面幾處，在父Adapter的父佈局

@NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
            LayoutInflater.from(context).inflate(R.layout.item_fathe_have_children, null, false);
            return new Holder(view);

        }
    }

被嵌套的RecycleView，即子RecycleView 的Adapter的

@NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

            View view = LayoutInflater.from(context).inflate(R.layout.item_child_item, viewGroup, false);
            return new Holder(view);
        }
    }

在父RecycleView 的LinearLayoutManager設置，一定要注意是父RecycleView

LinearLayoutManager layoutManager = new LinearLayoutManager(getContext()) {
            @Override
            public RecyclerView.LayoutParams generateDefaultLayoutParams() {
                return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT);
            }
        };
        layoutManager.setAutoMeasureEnabled(true);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recycler.setLayoutManager(layoutManager);

同時，注意，子RecycleView在xml文件裏的高度設置是wrap_content。