将地图数据映射到同一cardview中的Recyclerview Adapter中，而无需使用任何第三方

Question

我需要像在可扩展列表视图中那样将数据膨胀到父子关系中，但是在同一张卡片视图中，这设计起来相当复杂。因此，我尝试将数据排列在Hashmap<String,List<object>>中，成为键值对。但是现在无法理解如何将数据映射到recyclerview适配器。我不想使用SectionedRecyclerViewAdapter或任何第三方库。

输出结果如图所示，但根据地图数据，每个类别下应包含2个类别以及3和4个孩子。

我也尝试过此solution，但没有用。

我的地图数据：

Dry Clean
---------
Punjabi Set
Blazer
Safari suit 

Wash & Iron
-----------
Suit (3 pcs set)
Denim-Short
Dhoti
Waist Coat 

适配器类别：

public class OrderDetailsAdapter extends RecyclerView.Adapter<OrderDetailsAdapter.MyViewHolder> {
    private HashMap<String, List<OrderDetailsModel.CartDatum>> moviesList;
    Context mContext;
    MyViewHolder holder1;
    ProgressDialog progressDialog;
    ConnectionDetector cd;
    private SparseBooleanArray expandState = new SparseBooleanArray();
    HashMap<String, List<OrderDetailsModel.CartDatum>> hashMap;

    public OrderDetailsAdapter(HashMap<String, List<OrderDetailsModel.CartDatum>> moviesList, Context mContext) {
        this.moviesList = moviesList;
        this.mContext = mContext;
        progressDialog = new ProgressDialog(mContext);
        progressDialog.setMessage("Loading...");
        progressDialog.setCancelable(false);
        progressDialog.setCanceledOnTouchOutside(false);
        cd = new ConnectionDetector(mContext);
        this.hashMap = moviesList;
        for (int i = 0; i < moviesList.size(); i++) {
            expandState.append(i, false);
        }
    }

    private ObjectAnimator createRotateAnimator(final View target, final float from, final float to) {
        ObjectAnimator animator = ObjectAnimator.ofFloat(target, "rotation", from, to);
        animator.setDuration(300);
        animator.setInterpolator(new LinearInterpolator());
        return animator;
    }


    private void onClickButton(final LinearLayout expandableLayout, final RelativeLayout buttonLayout, final int i) {
        //Simply set View to Gone if not expanded
        //Not necessary but I put simple rotation on button layout
        if (expandableLayout.getVisibility() == View.VISIBLE) {
            createRotateAnimator(buttonLayout, 180f, 0f).start();
            expandableLayout.setVisibility(View.GONE);
            expandState.put(i, false);
        } else {
            createRotateAnimator(buttonLayout, 0f, 180f).start();
            expandableLayout.setVisibility(View.VISIBLE);
            expandState.put(i, true);
        }
    }


    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView tv_productname, tv_packetsize, tv_position;
        AppCompatImageView iv_product;
        RelativeLayout buttonLayout;
        LinearLayout expandableLayout;
        TextView tvCatName;

        public MyViewHolder(View view) {
            super(view);
            tvCatName = view.findViewById(R.id.tvCatName);
            tv_productname = view.findViewById(R.id.tv_productname);
            iv_product = view.findViewById(R.id.iv_product);
            tv_packetsize = view.findViewById(R.id.tv_packetsize);
            buttonLayout = view.findViewById(R.id.button);
            expandableLayout = view.findViewById(R.id.expandableLayout);
        }

    }


    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_orderdetails, parent, false);
        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        holder1 = holder;
        final boolean isExpanded = expandState.get(position);
        holder.expandableLayout.setVisibility(isExpanded ? View.VISIBLE : View.GONE);

        holder.buttonLayout.setRotation(expandState.get(position) ? 180f : 0f);
        holder.buttonLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(final View v) {
                onClickButton(holder.expandableLayout, holder.buttonLayout, position);
            }
        });

        for (Map.Entry<String, List<OrderDetailsModel.CartDatum>> entry : hashMap.entrySet()) {
            //System.out.println(entry.getKey()+" : "+entry.getValue());
            Log.e("VAluess", entry.getKey() + " : " + entry.getValue().size());
            holder.tvCatName.setText(entry.getKey());
            for (int j = 0; j < entry.getValue().size(); j++) {
                holder.tv_productname.setText(entry.getValue().get(j).getDressName());
                try {
                    Picasso.with(mContext)
                            .load(entry.getValue().get(j).getDressPhoto())
                            .into(holder.iv_product, new com.squareup.picasso.Callback() {
                                @Override
                                public void onSuccess() {
                                    // holder.progressbar.setVisibility(View.GONE);
                                }

                                @Override
                                public void onError() {
                                    holder.iv_product.setImageResource(R.mipmap.ic_launcher);
                                }
                            });
                } catch (Exception e) {
                }
            }
        }

    }


    @Override
    public int getItemCount() {
        return moviesList.size();
    }
}

Answer 1

我的要求与您的要求非常相似。我也使用了Hashmap<String,<Objects>>，但是我的解决方案对我自己来说似乎有点bug，因为我正在适配器类中动态扩展子视图，这当然不是应该的方式，但可以满足您的目的。任何建议或帮助将使代码变得更好...

//主要活动类别

public class MainActivity extends AppCompatActivity {

    List<Data> listData1 = new ArrayList<>();
    List<Data> listData2 = new ArrayList<>();
    List<Data> listData3 = new ArrayList<>();
    DataAdapter adapter;
    MapAdapter mapAdapter;
    Context mcontext;
    AlphabetIndexFastScrollRecyclerView alphabetIndexFastScrollRecyclerView;
    HashMap<String, List<Data>> listHash = new HashMap<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mcontext = this;



        listData1.add(new Data("Avik", 20.1));
        listData1.add(new Data("Arnab", 21.1));
        listData1.add(new Data("Anikit", 2));
        listData2.add(new Data("Rajjoy", 3));
        listData2.add(new Data("Sandipan", 4));
        listData2.add(new Data("Arindam", 54));
        listData2.add(new Data("Abhishek", 23));

        listData3.add(new Data("Raju",23));
        listData3.add(new Data("Nagarjuna",21));

        listHash.put("Dry Wash", listData1);
        listHash.put("Iron", listData2);




        alphabetIndexFastScrollRecyclerView = findViewById(R.id.recyclerView);
        alphabetIndexFastScrollRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));

        mapAdapter = new MapAdapter(mcontext, listHash);
        alphabetIndexFastScrollRecyclerView.setAdapter(mapAdapter);

    }
}