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思路：第一个recycleview的adapter里将所有用到的数据传进去，在第二个里面的convert方法里设置第二个adapter的数据，第二个adapter的recyclew写在第一个recycleview的item中，设置一个boolean值，convert方法中根据点击第一个recycleview的时候设为true显示第二个可见，再次点击设置false为不可见，通过给外部的点击回调控制boolean值，如在adapter这样写:

public void setOpenList(int position, boolean flag) {        this.openPosition = position;        isOpen = flag;        notifyDataSetChanged();    }

具体代码:

public class CoachEndAdapter extends BaseQuickAdapter
   
     {    private Context mContext;    private OnItemChildItemClickListener listener;    private List
    
      data;    private int openPosition = -1;    private boolean isOpen = false;    public CoachEndAdapter(Context mContext, @Nullable List
     
       data) {        super(R.layout.item_coach_end, data);        this.mContext = mContext;        this.data = data;    }    @Override    protected void convert(BaseViewHolder helper, CoachEndItem item) {        helper.setVisible(R.id.tv_coach_end, false);        int position = helper.getAdapterPosition();        helper.setText(R.id.rv_coach_end_city, item.getCity() + "  (" + item.getStations().size() + ")");        if (position == openPosition) {            //点击同一个会发送一个false过来            if (!isOpen) {                helper.setVisible(R.id.rv_coach_end_station_list, false)                        .setBackgroundColor(R.id.rv_coach_end_city,                                mContext.getResources().getColor(R.color.white));                return;            }            helper.setVisible(R.id.rv_coach_end_station_list, true)                    .setBackgroundColor(R.id.rv_coach_end_city,                            mContext.getResources().getColor(R.color.grey_200));            RecyclerView stationList = helper.getView(R.id.rv_coach_end_station_list);            stationList.setNestedScrollingEnabled(false);            stationList.setHasFixedSize(true);            stationList.setLayoutManager(new LinearLayoutManager(mContext));            CoachEndStationAdapter mAdapter = new CoachEndStationAdapter(item.getStations());            stationList.setAdapter(mAdapter);            mAdapter.setOnItemChildClickListener(new OnItemChildClickListener() {                @Override                public void onItemChildClick(BaseQuickAdapter adapter, View view, int position1) {                    CoachEndItem.StationsBean stationsBean = data.get(position).getStations().get(position1);                    if (listener != null) {                        listener.onItemChildItemClick(stationsBean);                    }                }            });        } else {            helper.setVisible(R.id.rv_coach_end_station_list, false)                    .setBackgroundColor(R.id.rv_coach_end_city,                            mContext.getResources().getColor(R.color.white));        }    }    public void setOpenList(int position, boolean flag) {        this.openPosition = position;        isOpen = flag;        notifyDataSetChanged();    }    public class CoachEndStationAdapter extends BaseQuickAdapter
      
        {        public CoachEndStationAdapter(@Nullable List
       
         data) {            super(R.layout.item_coach_end_station, data);        }        @Override        protected void convert(BaseViewHolder helper, CoachEndItem.StationsBean item) {            helper.setText(R.id.tv_station, item.getName())                    .addOnClickListener(R.id.tv_station);        }    }    public void setOnItemChildItemClickListener(OnItemChildItemClickListener listener) {        this.listener = listener;    }    public interface OnItemChildItemClickListener {        //列表的子列表的点击事件        void onItemChildItemClick(CoachEndItem.StationsBean stationBean);    }}
       
      
     
    
   

2.第一个adapter的布局:

3.第二个adapter的布局:

4.activity使用

public void initRecyclerView() {        endList.setNestedScrollingEnabled(false);        endList.setHasFixedSize(true);        endList.setLayoutManager(new LinearLayoutManager(this));        mAdapter = new CoachEndAdapter(this, datas);        endList.setAdapter(mAdapter);        mAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {            @Override            public void onItemClick(BaseQuickAdapter adapter, View view, int position) {                //第二次点击同一个则关闭                if (currentOpenPosition == position && isOpen) {                    isOpen = false;                    mAdapter.setOpenList(currentOpenPosition, false);                } else {                    isOpen = true;                    mAdapter.setOpenList(position, true);                    mAdapter.notifyDataSetChanged();                }                currentOpenPosition = position;            }        });        mAdapter.setOnItemChildItemClickListener(new CoachEndAdapter.OnItemChildItemClickListener() {            @Override            public void onItemChildItemClick(CoachEndItem.StationsBean stationBean) {                Intent intent = new Intent(CoachEndActivity.this, CoachActivity.class);                intent.putExtra("end", stationBean);                setResult(RESULT_OK, intent);                finish();            }        });    }

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