android - 应为 BEGIN_ARRAY 但为 BEGIN_OBJECT Android Retrofit

Question

我在我的应用程序中使用 Retrofit 将数据从 JSON 读取到我的应用程序。我有这个 JSON。 (我尝试了很多解决方案，但对我没有任何帮助)。请帮助我。我使用了与其他 JSON 相同的代码代码，它适用于此 This JSON URL但它不适用于我的 JSON

JSON My JSON is placed at this URL

我的界面:

    public interface SanaApi {

    String BASE_URL = "http://www.hhfoodies.com/salesnotifier/";

    @GET("sana_safinaz.php")
    Call<List<SanaSafinas>> getSana();
}

这是模型类:

  public class SanaSafinas {

    private String id;
    private String off;
    private String image;
    private String title;
    private String sale_price;
    private String original_price;

    public SanaSafinas(String id, String off, String image, String title, String sale_price, String original_price) {
        this.id = id;
        this.off = off;
        this.image = image;
        this.title = title;
        this.sale_price = sale_price;
        this.original_price = original_price;
    }

    public String getId() {
        return id;
    }

    public String getOff() {
        return off;
    }

    public String getImage() {
        return image;
    }

    public String getTitle() {
        return title;
    }

    public String getSale_price() {
        return sale_price;
    }

    public String getOriginal_price() {
        return original_price;
    }
}

这是主要 Activity :

 public class MainActivity extends AppCompatActivity {

    ListView listView;

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

        listView = (ListView) findViewById(R.id.listViewHeroes);

        //calling the method to display the heroes
        getSana();
    }

    private void getSana() {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(SanaApi.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create()) //Here we are using the GsonConverterFactory to directly convert json data to object
                .build();

        SanaApi api = retrofit.create(SanaApi.class);

        Call<List<SanaSafinas>> call = api.getSana();

        call.enqueue(new Callback<List<SanaSafinas>>() {
            @Override
            public void onResponse(Call<List<SanaSafinas>> call, Response<List<SanaSafinas>> response) {
                List<SanaSafinas> heroList = response.body();

                //Creating an String array for the ListView
                String[] heroes = new String[heroList.size()];

                //looping through all the heroes and inserting the names inside the string array
                for (int i = 0; i < heroList.size(); i++) {
                    heroes[i] = heroList.get(i).getSale_price();
                }


                //displaying the string array into listview
                listView.setAdapter(new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, heroes));

            }



            @Override
            public void onFailure(Call<List<SanaSafinas>> call, Throwable t) {
                Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });
    }


}

Answer 1

您的 retrofit 电话需要一个 List<SanaSafinas> ，它是从 JSON 数组生成的。

您的 JSON 不是一个数组，它是一个对象，这就是您需要告诉改造您期望的内容。

class Response {
  private final List<SanaSafinas> data;

  public Response(List<SanaSafinas> data) {
    this.data = data;
  }

  // Getter...
}

然后您的界面将如下所示:

public interface SanaApi {

String BASE_URL = "http://www.hhfoodies.com/salesnotifier/";

@GET("sana_safinaz.php")
Call<Response> getSana();

JSON 对象像您一样用花括号括起来:

{
  "message": "",
  "status": 1,
  "data": [
  {
    "id": "s18220052",
    "off": "50% Off",
    "image": "https://www.sanasafinaz.com/media/catalog/product/cache/2cf0e7f44e364cdf6f00ee795133d228/s/1/s18220052_1_.jpg",
    "title": "SAFARI-O",
    "sale_price": "PKR 2,720.00",
    "original_price": "PKR 5440 "
  },
...
}

JSON 数组包含在方括号中，就像您的第一个 url:

[
  {
    "name": "Captain America",
    "realname": "Steve Rogers",
    "team": "Avengers",
   "firstappearance": "1941",
   ....
  },
  ...
}