gson JSON onResponse -列表将不会填充数据

f2uvfpb9  于 2022-11-06  发布在  其他
关注(0)|答案(2)|浏览(180)

我得到了一个工作的应用程序（有点）。它是为了填充屏幕从JSON数据的请求。我以为我有什么到目前为止会工作，但我猜不是。onResponse似乎从来没有被调用，所以数据从来没有被分配到一个变量进行处理，我不知道如何解决这个问题。任何和所有的帮助是非常感谢。
下面是我的相关代码：
我的JSON数据是：

  1. {
  2.    "popular":[
  3.       {
  4.          "name":"Pizza",
  5.          "imageURL":"https://static4.depositphotos.com/1016418/315/i/600/depositphotos_3158962-stock-photo-pepperoni-pizza-isolated.jpg",
  6.          "rating":"4.8",
  7.          "deliveryTime":"45 min",
  8.          "deliveryCharges":"Free Delivery",
  9.          "price":"15",
  10.          "note":"Delicious"
  11.       },
  12.       {
  13.          "name":"Chick-Fil-A",
  14.          "imageURL":"https://media.istockphoto.com/photos/chicken-bacon-club-sandwich-picture-id585602032?k=6&m=585602032&s=612x612&w=0&h=DzlMVMOaqC25Zf78NPGzr9nLOf7wANEgv9u_vScu4d8=",
  15.          "rating":"5.0",
  16.          "deliveryTime":"15 min",
  17.          "deliveryCharges":"3",
  18.          "price":"7",
  19.          "note":"Classic"
  20.       },
  21.       {
  22.          "name":"Mac & Cheese",
  23.          "imageURL":"https://media.istockphoto.com/photos/homemade-baked-creamy-macaroni-and-cheese-picture-id483485720?k=6&m=483485720&s=612x612&w=0&h=u2Wb4hR0cIqNAm8q_4j-oFPrtC4hT_YXaq2srA2zmqI=",
  24.          "rating":"4.7",
  25.          "deliveryTime":"20 min",
  26.          "deliveryCharges":"1",
  27.          "price":"4",
  28.          "note":"Homestyle"
  29.       }
  30.    ],
  31.    "recommended":[
  32.       {
  33.          "name":"Chicken Tikka Masala",
  34.          "imageURL":"https://media.istockphoto.com/photos/chicken-tikka-masala-curry-with-rice-and-naan-bread-picture-id1143530019?k=6&m=1143530019&s=612x612&w=0&h=aOCxTVcwi88NHCX9-xgNu7cmPX9rq5AGtEVYblNTnGc=",
  35.          "rating":"4.8",
  36.          "deliveryTime":"25 min",
  37.          "deliveryCharges":"2",
  38.          "price":"14",
  39.          "note":"Fan Favorite"
  40.       },
  41.       {
  42.          "name":"Strawberry Milkshake",
  43.          "imageURL":"https://thumbs.dreamstime.com/b/strawberry-milkshake-covered-whipped-cream-plastic-glass-isolated-white-background-44432579.jpg",
  44.          "rating":"4.5",
  45.          "deliveryTime":"10 min",
  46.          "deliveryCharges":"0",
  47.          "price":"4",
  48.          "note":"Chilly"
  49.       },
  50.       {
  51.          "name":"3 Tacos",
  52.          "imageURL":"https://previews.123rf.com/images/gdolgikh/gdolgikh1703/gdolgikh170300221/74432760-mexican-tacos-with-beef.jpg",
  53.          "rating":"4.6",
  54.          "deliveryTime":"17 min",
  55.          "deliveryCharges":"1",
  56.          "price":"12",
  57.          "note":"Hard or Soft Shell"
  58.       }
  59.    ],
  60.    "allmenu":[
  61.       {
  62.          "name":"Pizza",
  63.          "imageURL":"https://static4.depositphotos.com/1016418/315/i/600/depositphotos_3158962-stock-photo-pepperoni-pizza-isolated.jpg",
  64.          "rating":"4.8",
  65.          "deliveryTime":"45 min",
  66.          "deliveryCharges":"Free Delivery",
  67.          "price":"15",
  68.          "note":"Delicious"
  69.       },
  70.       {
  71.          "name":"Chick-Fil-A",
  72.          "imageURL":"https://media.istockphoto.com/photos/chicken-bacon-club-sandwich-picture-id585602032?k=6&m=585602032&s=612x612&w=0&h=DzlMVMOaqC25Zf78NPGzr9nLOf7wANEgv9u_vScu4d8=",
  73.          "rating":"5.0",
  74.          "deliveryTime":"15 min",
  75.          "deliveryCharges":"3",
  76.          "price":"7",
  77.          "note":"Classic"
  78.       },
  79.       {
  80.          "name":"Mac & Cheese",
  81.          "imageURL":"https://media.istockphoto.com/photos/homemade-baked-creamy-macaroni-and-cheese-picture-id483485720?k=6&m=483485720&s=612x612&w=0&h=u2Wb4hR0cIqNAm8q_4j-oFPrtC4hT_YXaq2srA2zmqI=",
  82.          "rating":"4.7",
  83.          "deliveryTime":"20 min",
  84.          "deliveryCharges":"1",
  85.          "price":"4",
  86.          "note":"Homestyle"
  87.       },
  88.       {
  89.          "name":"Chicken Tikka Masala",
  90.          "imageURL":"https://media.istockphoto.com/photos/chicken-tikka-masala-curry-with-rice-and-naan-bread-picture-id1143530019?k=6&m=1143530019&s=612x612&w=0&h=aOCxTVcwi88NHCX9-xgNu7cmPX9rq5AGtEVYblNTnGc=",
  91.          "rating":"4.8",
  92.          "deliveryTime":"25 min",
  93.          "deliveryCharges":"2",
  94.          "price":"14",
  95.          "note":"Fan Favorite"
  96.       },
  97.       {
  98.          "name":"Strawberry Milkshake",
  99.          "imageURL":"https://thumbs.dreamstime.com/b/strawberry-milkshake-covered-whipped-cream-plastic-glass-isolated-white-background-44432579.jpg",
  100.          "rating":"4.5",
  101.          "deliveryTime":"10 min",
  102.          "deliveryCharges":"0",
  103.          "price":"4",
  104.          "note":"Chilly"
  105.       },
  106.       {
  107.          "name":"3 Tacos",
  108.          "imageURL":"https://previews.123rf.com/images/gdolgikh/gdolgikh1703/gdolgikh170300221/74432760-mexican-tacos-with-beef.jpg",
  109.          "rating":"4.6",
  110.          "deliveryTime":"17 min",
  111.          "deliveryCharges":"1",
  112.          "price":"12",
  113.          "note":"Hard or Soft Shell"
  114.       }
  115.    ]
  116. }

我有适用于Allmenu、FoodData、Popular和Recommended的模型。
所有菜单：

  1. package com.example.bearcateats.model;
  2. import javax.annotation.Generated;
  3. import com.google.gson.annotations.Expose;
  4. import com.google.gson.annotations.SerializedName;
  6. @Generated("jsonschema2pojo")
  7. public class Allmenu {
  9.     @SerializedName("name")
  10.     @Expose
  11.     private String name;
  12.     @SerializedName("imageURL")
  13.     @Expose
  14.     private String imageURL;
  15.     @SerializedName("rating")
  16.     @Expose
  17.     private String rating;
  18.     @SerializedName("deliveryTime")
  19.     @Expose
  20.     private String deliveryTime;
  21.     @SerializedName("deliveryCharges")
  22.     @Expose
  23.     private String deliveryCharges;
  24.     @SerializedName("price")
  25.     @Expose
  26.     private String price;
  27.     @SerializedName("note")
  28.     @Expose
  29.     private String note;
  31.     public String getName() {
  32.         return name;
  33.     }
  35.     public void setName(String name) {
  36.         this.name = name;
  37.     }
  39.     public String getImageURL() {
  40.         return imageURL;
  41.     }
  43.     public void setImageURL(String imageURL) {
  44.         this.imageURL = imageURL;
  45.     }
  47.     public String getRating() {
  48.         return rating;
  49.     }
  51.     public void setRating(String rating) {
  52.         this.rating = rating;
  53.     }
  55.     public String getDeliveryTime() {
  56.         return deliveryTime;
  57.     }
  59.     public void setDeliveryTime(String deliveryTime) {
  60.         this.deliveryTime = deliveryTime;
  61.     }
  63.     public String getDeliveryCharges() {
  64.         return deliveryCharges;
  65.     }
  67.     public void setDeliveryCharges(String deliveryCharges) {
  68.         this.deliveryCharges = deliveryCharges;
  69.     }
  71.     public String getPrice() {
  72.         return price;
  73.     }
  75.     public void setPrice(String price) {
  76.         this.price = price;
  77.     }
  79.     public String getNote() {
  80.         return note;
  81.     }
  83.     public void setNote(String note) {
  84.         this.note = note;
  85.     }
  87. }

食品数据：

  1. package com.example.bearcateats.model;
  3. import java.util.List;
  4. import javax.annotation.Generated;
  5. import com.google.gson.annotations.Expose;
  6. import com.google.gson.annotations.SerializedName;
  8. @Generated("jsonschema2pojo")
  9. public class FoodData {
  11.     @SerializedName("popular")
  12.     @Expose
  13.     private List<Popular> popular = null;
  14.     @SerializedName("recommended")
  15.     @Expose
  16.     private List<Recommended> recommended = null;
  17.     @SerializedName("allmenu")
  18.     @Expose
  19.     private List<Allmenu> allmenu = null;
  21.     public List<Popular> getPopular() {
  22.         return popular;
  23.     }
  25.     public void setPopular(List<Popular> popular) {
  26.         this.popular = popular;
  27.     }
  29.     public List<Recommended> getRecommended() {
  30.         return recommended;
  31.     }
  33.     public void setRecommended(List<Recommended> recommended) {
  34.         this.recommended = recommended;
  35.     }
  37.     public List<Allmenu> getAllmenu() {
  38.         return allmenu;
  39.     }
  41.     public void setAllmenu(List<Allmenu> allmenu) {
  42.         this.allmenu = allmenu;
  43.     }
  45. }

人气：

  1. package com.example.bearcateats.model;
  3. import javax.annotation.Generated;
  4. import com.google.gson.annotations.Expose;
  5. import com.google.gson.annotations.SerializedName;
  7. @Generated("jsonschema2pojo")
  8. public class Popular {
  10.     @SerializedName("name")
  11.     @Expose
  12.     private String name;
  13.     @SerializedName("imageURL")
  14.     @Expose
  15.     private String imageURL;
  16.     @SerializedName("rating")
  17.     @Expose
  18.     private String rating;
  19.     @SerializedName("deliveryTime")
  20.     @Expose
  21.     private String deliveryTime;
  22.     @SerializedName("deliveryCharges")
  23.     @Expose
  24.     private String deliveryCharges;
  25.     @SerializedName("price")
  26.     @Expose
  27.     private String price;
  28.     @SerializedName("note")
  29.     @Expose
  30.     private String note;
  32.     public String getName() {
  33.         return name;
  34.     }
  36.     public void setName(String name) {
  37.         this.name = name;
  38.     }
  40.     public String getImageURL() {
  41.         return imageURL;
  42.     }
  44.     public void setImageURL(String imageURL) {
  45.         this.imageURL = imageURL;
  46.     }
  48.     public String getRating() {
  49.         return rating;
  50.     }
  52.     public void setRating(String rating) {
  53.         this.rating = rating;
  54.     }
  56.     public String getDeliveryTime() {
  57.         return deliveryTime;
  58.     }
  60.     public void setDeliveryTime(String deliveryTime) {
  61.         this.deliveryTime = deliveryTime;
  62.     }
  64.     public String getDeliveryCharges() {
  65.         return deliveryCharges;
  66.     }
  68.     public void setDeliveryCharges(String deliveryCharges) {
  69.         this.deliveryCharges = deliveryCharges;
  70.     }
  72.     public String getPrice() {
  73.         return price;
  74.     }
  76.     public void setPrice(String price) {
  77.         this.price = price;
  78.     }
  80.     public String getNote() {
  81.         return note;
  82.     }
  84.     public void setNote(String note) {
  85.         this.note = note;
  86.     }
  88. }

建议：

  1. package com.example.bearcateats.model;
  3. import javax.annotation.Generated;
  4. import com.google.gson.annotations.Expose;
  5. import com.google.gson.annotations.SerializedName;
  7. @Generated("jsonschema2pojo")
  8. public class Recommended {
  10.     @SerializedName("name")
  11.     @Expose
  12.     private String name;
  13.     @SerializedName("imageURL")
  14.     @Expose
  15.     private String imageURL;
  16.     @SerializedName("rating")
  17.     @Expose
  18.     private String rating;
  19.     @SerializedName("deliveryTime")
  20.     @Expose
  21.     private String deliveryTime;
  22.     @SerializedName("deliveryCharges")
  23.     @Expose
  24.     private String deliveryCharges;
  25.     @SerializedName("price")
  26.     @Expose
  27.     private String price;
  28.     @SerializedName("note")
  29.     @Expose
  30.     private String note;
  32.     public String getName() {
  33.         return name;
  34.     }
  36.     public void setName(String name) {
  37.         this.name = name;
  38.     }
  40.     public String getImageURL() {
  41.         return imageURL;
  42.     }
  44.     public void setImageURL(String imageURL) {
  45.         this.imageURL = imageURL;
  46.     }
  48.     public String getRating() {
  49.         return rating;
  50.     }
  52.     public void setRating(String rating) {
  53.         this.rating = rating;
  54.     }
  56.     public String getDeliveryTime() {
  57.         return deliveryTime;
  58.     }
  60.     public void setDeliveryTime(String deliveryTime) {
  61.         this.deliveryTime = deliveryTime;
  62.     }
  64.     public String getDeliveryCharges() {
  65.         return deliveryCharges;
  66.     }
  68.     public void setDeliveryCharges(String deliveryCharges) {
  69.         this.deliveryCharges = deliveryCharges;
  70.     }
  72.     public String getPrice() {
  73.         return price;
  74.     }
  76.     public void setPrice(String price) {
  77.         this.price = price;
  78.     }
  80.     public String getNote() {
  81.         return note;
  82.     }
  84.     public void setNote(String note) {
  85.         this.note = note;
  86.     }
  88. }

主要：

  1. package com.example.bearcateats;
  3. import android.os.Bundle;
  4. import android.widget.Toast;
  6. import retrofit2.Call;
  7. import retrofit2.Callback;
  8. import retrofit2.Response;
  10. import androidx.appcompat.app.AppCompatActivity;
  11. import androidx.recyclerview.widget.LinearLayoutManager;
  12. import androidx.recyclerview.widget.RecyclerView;
  14. import com.example.bearcateats.adapters.PopularAdapter;
  15. import com.example.bearcateats.adapters.RecommendedAdapter;
  16. import com.example.bearcateats.model.Allmenu;
  17. import com.example.bearcateats.model.FoodData;
  18. import com.example.bearcateats.model.Popular;
  19. import com.example.bearcateats.model.Recommended;
  20. import com.example.bearcateats.retrofit.ApiInterface;
  21. import com.example.bearcateats.retrofit.RetrofitClient;
  22. import com.example.bearcateats.adapters.AllMenuAdapter;
  24. import java.util.List;
  26. public class MainActivity extends AppCompatActivity {
  28.     ApiInterface apiInterface;
  30.     RecyclerView popularRecyclerView, recommendedRecyclerView, allMenuRecyclerView;
  32.     PopularAdapter popularAdapter;
  33.     RecommendedAdapter recommendedAdapter;
  34.     AllMenuAdapter allMenuAdapter;
  36.     @Override
  37.     protected void onCreate(Bundle savedInstanceState) {
  38.         super.onCreate(savedInstanceState);
  39.         setContentView(R.layout.activity_main);
  41.         apiInterface = RetrofitClient.getRetrofitInstance().create(ApiInterface.class);
  43.         Call<List<FoodData>> call = apiInterface.getAllData();
  44.         call.enqueue(new Callback<List<FoodData>>() {
  45.             @Override
  46.             public void onResponse(Call<List<FoodData>> call, Response<List<FoodData>> response) {
  47.                 System.out.println("TEST!!!!!!!!!!!!!!");
  48.                 List<FoodData> MenuList;
  49.                 MenuList = response.body();
  50.                 if(MenuList == null) {
  51.                     System.out.println("MenuList!!!!!!!!!!!!!!");
  52.                 }
  54.                 List <FoodData> test1 = (List<FoodData>) MenuList.get(0);
  56.                 List<Popular> popular = ((FoodData) test1).getPopular();
  58.                 getPopularData(popular);
  59.                 System.out.println("GET POPULAR RAN!!!!!!!!!!!!!!");
  61.                 getRecommendedData(MenuList.get(0).getRecommended());
  62.             }
  64.             @Override
  65.             public void onFailure(Call<List<FoodData>> call, Throwable t) {
  66.                 Toast.makeText(MainActivity.this, "Server is not responding.", Toast.LENGTH_SHORT).show();
  67.             }
  68.         });
  70.     }
  72.     private void  getPopularData(List<Popular> popularList){
  74.         popularRecyclerView = findViewById(R.id.popular_recycler);
  75.         popularAdapter = new PopularAdapter(this, popularList);
  76.         RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
  77.         popularRecyclerView.setLayoutManager(layoutManager);
  78.         popularRecyclerView.setAdapter(popularAdapter);
  80.     }
  82.     private void  getRecommendedData(List<Recommended> recommendedList){
  84.         recommendedRecyclerView = findViewById(R.id.recommended_recycler);
  85.         recommendedAdapter = new RecommendedAdapter(this, recommendedList);
  86.         RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
  87.         recommendedRecyclerView.setLayoutManager(layoutManager);
  88.         recommendedRecyclerView.setAdapter(recommendedAdapter);
  90.     }
  92.     private void  getAllMenu(List<Allmenu> allmenuList){
  94.         allMenuRecyclerView = findViewById(R.id.all_menu_recycler);
  95.         allMenuAdapter = new AllMenuAdapter(this, allmenuList);
  96.         RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
  97.         allMenuRecyclerView.setLayoutManager(layoutManager);
  98.         allMenuRecyclerView.setAdapter(allMenuAdapter);
  99.         allMenuAdapter.notifyDataSetChanged();
  101.     }
  102. }

食物详情

  1. {
  3.     // now we will get data from intent and set to UI
  5.     ImageView imageView;
  6.     TextView itemName, itemPrice, itemRating;
  7.     RatingBar ratingBar;
  9.     String name, price, rating, imageUrl;
  11.     @Override
  12.     protected void onCreate(Bundle savedInstanceState) {
  13.         super.onCreate(savedInstanceState);
  14.         setContentView(R.layout.activity_food_details);
  16.         Intent intent = getIntent();
  18.         name = intent.getStringExtra("name");
  19.         price = intent.getStringExtra("price");
  20.         rating = intent.getStringExtra("rating");
  21.         imageUrl = intent.getStringExtra("image");
  23.         imageView = findViewById(R.id.imageView5);
  24.         itemName = findViewById(R.id.name);
  25.         itemPrice = findViewById(R.id.price);
  26.         itemRating = findViewById(R.id.rating);
  27.         ratingBar = findViewById(R.id.ratingBar);
  29.         Glide.with(getApplicationContext()).load(imageUrl).into(imageView);
  30.         itemName.setText(name);
  31.         itemPrice.setText("$ "+price);
  32.         itemRating.setText(rating);
  33.         ratingBar.setRating(Float.parseFloat(rating));
  35.     }
  36. }
Gson

2条答案

按热度按时间
ef1yzkbh

ef1yzkbh1#

有几个愚蠢的错误。我已经修复了你所有的错误。你的JSON或Response数据类没有任何错误。正确的response在onResponse()回调中被接收。问题存在于你代码的其他部分。只要一步一步地遵循。

步骤-1

在解析api调用中的response数据时，替换以下代码，如下所示：

  1. call.enqueue(new Callback<List<FoodData>>() {
  2.         @Override
  3.         public void onResponse(Call<List<FoodData>> call, Response<List<FoodData>> response) {
  4.             if (response.isSuccessful()){
  5.                 if (response.body() != null){
  6.                     List<Popular> popular = response.body().get(0).getPopular();
  8.                     getPopularData(popular);
  10.                     getRecommendedData(response.body().get(0).getRecommended());
  11.                 }
  12.             }
  13.         }
  15.         @Override
  16.         public void onFailure(Call<List<FoodData>> call, Throwable t) {
  17.             Toast.makeText(MainActivity.this, "Server is not responding.", Toast.LENGTH_SHORT).show();
  18.         }
  19.     });

步骤2

在PopularAdapter类中替换getItemCount()方法，如下所示：

  1. @Override
  2. public int getItemCount() {
  3.     //return 0;   // Returning 0 will show nothing in RecyclerView.
  4.    return popularList.size();
  5. }

步骤3：

在RecommendedAdapter类中，您将错误的xml用于ViewHolder。请按如下所示进行替换：

  1. @NonNull
  2. @Override
  3. public RecommendedViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
  4.     //View view = LayoutInflater.from(context).inflate(R.layout.popular_recycler_items, parent, false);
  5.     View view = LayoutInflater.from(context).inflate(R.layout.recommended_recyvler_items, parent, false);
  6.     return new RecommendedViewHolder(view);
  7. }

并且也像下面这样替换getItemCount()的方法：

  1. @Override
  2. public int getItemCount() {
  3.     return recommendedList.size();
  4. }

更新日期：-

为什么在api调用的onSuccess()内调用相同的api？我已经更新了您的onCreate()方法，如下所示：

  1. @Override
  2. protected void onCreate(Bundle savedInstanceState) {
  3.     super.onCreate(savedInstanceState);
  4.     setContentView(R.layout.activity_main);
  6.     apiInterface = RetrofitClient.getRetrofitInstance().create(ApiInterface.class);
  8.     Call<List<FoodData>> call = apiInterface.getAllData();
  9.     call.enqueue(new Callback<List<FoodData>>() {
  10.         @Override
  11.         public void onResponse(Call<List<FoodData>> call, Response<List<FoodData>> response) {
  12.             if (response.isSuccessful()) {
  13.                 if (response.body() != null) {
  14.                     getPopularData(response.body().get(0).getPopular());
  15.                     getRecommendedData(response.body().get(0).getRecommended());
  16.                     getAllMenu(response.body().get(0).getAllmenu());
  17.                 }
  18.             }
  19.         /*              
  20.      call.clone().enqueue(new Callback<List<FoodData>>() {
  21.                 @Override
  22.                 public void onResponse(Call<List<FoodData>> call, Response<List<FoodData>> response) {
  23.                     if (response.isSuccessful()) {
  24.                         if (response.body() != null) {
  25.                             response.code();
  26.                             getPopularData(response.body().get(0).getPopular());
  27.                             getRecommendedData(response.body().get(0).getRecommended());
  28.                             getAllMenu(response.body().get(0).getAllmenu());
  29.                         }
  30.                     }
  31.                 }
  33.                 @Override
  34.                 public void onFailure(Call<List<FoodData>> call, Throwable t) {
  35.                     response.code();
  36.                     Toast.makeText(MainActivity.this, t.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
  37.                 }
  38.             });*/
  39.         }
  41.         @Override
  42.         public void onFailure(Call<List<FoodData>> call, Throwable t) {
  43.             Toast.makeText(MainActivity.this, t.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
  44.         }
  45.     });
  46. }
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赞(0）分享  回复(0）举报  2022-11-06
ix0qys7i

ix0qys7i2#

我看到https://francescainfranca.github.io/menuJSON/index.json中的JSON是单个FoodData JSON对象，而不是JSON数组。
这会在运行应用程序时导致以下异常。因此，请更改JSON结构或使应用程序直接使用FoodData，而不是List .

此外，吐司消息（服务器没有响应）也显示在您已添加“失败响应”的运行上。
希望这对你有帮助谢谢。

赞(0）分享  回复(0）举报  2022-11-06
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