如何在 Android Recyclerview 中显示包含在 JSON 数组中的 JSON 对象 [英] How to show JSON objects included in JSON Array in Android Recyclerview

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问题描述

我有以下 JSON 数据，即一个数组中有 10 个对象.我正在 recyclerview 中获取对象，没有任何错误.

I have the following JSON data i.e 10 objects in one array. I am fetching objects in recyclerview wihtout any error.

现在我需要做两件事:

  1. 我想在用户滚动 recyclerview 时显示下一页数据，即(接下来的 10 条记录等).
  2. 我想在每个对象的 recyclerview 中显示 total_quotes.我在一个空对象引用上面对LeadsMeta.getTotalQuotes()"；显示总报价时出现此错误.

我在 Adapter 的 onBind 中注释了该行.

I have commented that line in onBind in Adapter.

请帮我解决这两个问题.非常感谢.

Please help me to solve these two problems. Many thanks in advance.

JSON 数据

{
   "meta":{
      "code":200,
      "message":"success",
      "total_pages":247,
      "current_page":1,
      "total_items":2469,
      "total_quotes":5
   },
   "data":[
      {
         "id":"4968",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Pune",
         "name":"Shashikant ",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 21:53:38"
      },
      {
         "id":"4963",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Bangalore",
         "name":"Amani",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 20:46:03"
      },
      {
         "id":"4962",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Delhi",
         "name":"Mechanical Engineer",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 20:23:00"
      },
      {
         "id":"4961",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Mumbai",
         "name":"Ankush patil",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 20:20:20"
      },
      {
         "id":"4960",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Delhi",
         "name":"ER Vikash Thakur",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 20:17:32"
      },
      {
         "id":"4957",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Kolkata",
         "name":"Shiladitya Ghosh",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 20:09:44"
      },
      {
         "id":"4956",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Delhi",
         "name":"Vikash",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 20:08:44"
      },
      {
         "id":"4953",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Rishikesh",
         "name":"Rahul",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 19:51:17"
      },
      {
         "id":"4950",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Pune",
         "name":"Abhishek",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 19:43:27"
      },
      {
         "id":"4949",
         "topic":"Topic",
         "sub_topic":"Sub Topic",
         "city":"Chandigarh ",
         "name":"K Singh ",
         "quotes":"0",
         "credits":"10",
         "timestamp":"2021-01-05 19:40:36"
      }
   ]
}

我的片段:

public class LeadsFragment extends Fragment {

    RecyclerView recyclerView;
    RecyclerView.LayoutManager layoutManager;
    private static final String url = "myurl";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_leads, container, false);

        recyclerView = view.findViewById(R.id.recyclerview);

        StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {

                GsonBuilder gsonBuilder = new GsonBuilder();
                Gson gson = gsonBuilder.create();
                LeadModel leadsModelList = gson.fromJson(response, LeadModel.class);

                recyclerView.setHasFixedSize(true);
                layoutManager = new LinearLayoutManager(getActivity());
                recyclerView.setLayoutManager(layoutManager);
                LeadsAdapter leadsAdapter = new LeadsAdapter(getContext(), leadsModelList, recyclerView);
                recyclerView.setAdapter(leadsAdapter);

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

                Toast.makeText(getContext(), error.toString(), Toast.LENGTH_SHORT).show();

            }
        });

        RequestQueue queue = Volley.newRequestQueue(getContext());
        queue.add(stringRequest);

        return view;
    }
}

我的适配器:

public class LeadsAdapter extends RecyclerView.Adapter<LeadsAdapter.ViewHolder> {

    Context context;
    LeadModel leadsModelList;
    RecyclerView recyclerView;
    final View.OnClickListener onClickListener = new MyOnClickListener();

    public LeadsAdapter(Context context, LeadModel leadsModelList, RecyclerView recyclerView) {
        this.context = context;
        this.leadsModelList = leadsModelList;
        this.recyclerView = recyclerView;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        TextView name, topic, sub_topic, city, credits, quotes;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);

            name = itemView.findViewById(R.id.tvName);
            topic = itemView.findViewById(R.id.tvTopic);
            sub_topic = itemView.findViewById(R.id.tvSubTopic);
            city = itemView.findViewById(R.id.tvLocation);
            credits = itemView.findViewById(R.id.tvCredits);
            quotes = itemView.findViewById(R.id.tvQuotes);
        }
    }

    @NonNull
    @Override
    public LeadsAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {

        LayoutInflater inflater = LayoutInflater.from(context);
        View view = inflater.inflate(R.layout.lead_card, viewGroup, false);
        view.setOnClickListener(onClickListener);
        LeadsAdapter.ViewHolder viewHolder = new LeadsAdapter.ViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull LeadsAdapter.ViewHolder viewHolder, int position) {

        viewHolder.name.setText(leadsModelList.getData().get(position).getName());
        viewHolder.topic.setText(leadsModelList.getData().get(position).getTopic());
        viewHolder.sub_topic.setText(leadsModelList.getData().get(position).getSubTopic());
        viewHolder.city.setText(leadsModelList.getData().get(position).getCity());
        viewHolder.credits.setText(leadsModelList.getData().get(position).getCredits()+ " Credits");
//        viewHolder.quotes.setText(leadsModelList.getData().get(position).getQuotes()+"/"+ leadsModelList.getMeta().getTotalQuotes() +" Quotes");
    }

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

        }
    }
}

模型类:

public class LeadModel {

    @SerializedName("leadsMeta")
    @Expose
    private LeadsMeta leadsMeta;
    @SerializedName("data")
    @Expose
    private List<LeadsData> data = null;

    public LeadsMeta getMeta() {
        return leadsMeta;
    }

    public void setMeta(LeadsMeta leadsMeta) {
        this.leadsMeta = leadsMeta;
    }

    public List<LeadsData> getData() {
        return data;
    }

    public void setData(List<LeadsData> data) {
        this.data = data;
    }

}

元类

public class LeadsMeta {

    @SerializedName("code")
    @Expose
    private Integer code;
    @SerializedName("message")
    @Expose
    private String message;
    @SerializedName("total_pages")
    @Expose
    private Integer totalPages;
    @SerializedName("current_page")
    @Expose
    private Integer currentPage;
    @SerializedName("total_items")
    @Expose
    private Integer totalItems;
    @SerializedName("total_quotes")
    @Expose
    private Integer totalQuotes;

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public Integer getTotalPages() {
        return totalPages;
    }

    public void setTotalPages(Integer totalPages) {
        this.totalPages = totalPages;
    }

    public Integer getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(Integer currentPage) {
        this.currentPage = currentPage;
    }

    public Integer getTotalItems() {
        return totalItems;
    }

    public void setTotalItems(Integer totalItems) {
        this.totalItems = totalItems;
    }

    public Integer getTotalQuotes() {
        return totalQuotes;
    }

    public void setTotalQuotes(Integer totalQuotes) {
        this.totalQuotes = totalQuotes;
    }

}

数据类

public class LeadsData {

    @SerializedName("id")
    @Expose
    private String id;
    @SerializedName("topic")
    @Expose
    private String topic;
    @SerializedName("sub_topic")
    @Expose
    private String subTopic;
    @SerializedName("city")
    @Expose
    private String city;
    @SerializedName("name")
    @Expose
    private String name;
    @SerializedName("quotes")
    @Expose
    private String quotes;
    @SerializedName("credits")
    @Expose
    private String credits;
    @SerializedName("timestamp")
    @Expose
    private String timestamp;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getTopic() {
        return topic;
    }

    public void setTopic(String topic) {
        this.topic = topic;
    }

    public String getSubTopic() {
        return subTopic;
    }

    public void setSubTopic(String subTopic) {
        this.subTopic = subTopic;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getQuotes() {
        return quotes;
    }

    public void setQuotes(String quotes) {
        this.quotes = quotes;
    }

    public String getCredits() {
        return credits;
    }

    public void setCredits(String credits) {
        this.credits = credits;
    }

    public String getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(String timestamp) {
        this.timestamp = timestamp;
    }

}

推荐答案

对于你的第一个问题:

您需要检查这个 代码.在 MainActivity.java 类中，这里有一个方法 loadMore().在您的情况下，您需要进行 API 调用以加载 10 个以上的项目，然后通知您的适配器您有新项目，它会将它们加载到您的列表中.这就是您如何使用无穷无尽的项目来实现您的回收站视图.

You need to check this code. In MainActivity.java class here is a method loadMore(). In your case you need to do your API call to load 10 more items and then notify your adapter that you have new items and it will load them in your list. Thats how you can implement your recyclerview with endless items.

对于第二个问题:

您应该将 @SerializedName 中的 leadsMeta 更改为 meta.这是您编辑的课程:

You should change leadsMeta to meta in your @SerializedName. Here is your edited class:

public class LeadModel {

    @SerializedName("meta")
    @Expose
    private LeadsMeta leadsMeta;
    @SerializedName("data")
    @Expose
    private List<LeadsData> data = null;

    public LeadsMeta getMeta() {
        return leadsMeta;
    }

    public void setMeta(LeadsMeta leadsMeta) {
        this.leadsMeta = leadsMeta;
    }

    public List<LeadsData> getData() {
        return data;
    }

    public void setData(List<LeadsData> data) {
        this.data = data;
    }

}

这篇关于如何在 Android Recyclerview 中显示包含在 JSON 数组中的 JSON 对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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