java - 读取 JSON - Retrofit - Android Studio

Question

我真的需要帮助。我无法读取 JSON，而且我不知道我做错了什么。

我将把我的代码放在这里。

我有这个 Json

 {
    "id": "288",
    "name": "Tarjeta Shopping",
    "secure_thumbnail": "https://www.mercadopago.com/org-img/MP3/API/logos/288.gif",
    "thumbnail": "http://img.mlstatic.com/org-img/MP3/API/logos/288.gif",
    "processing_mode": "aggregator",
    "merchant_account_id": null
  }

这是我的类，应该代表该 JSON

public class Tarjeta {

@SerializedName("id")
@Expose
private String id;
@SerializedName("name")
@Expose
private String name;
@SerializedName("secure_thumbnail")
@Expose
private String secureThumbnail;
@SerializedName("thumbnail")
@Expose
private String thumbnail;
@SerializedName("processing_mode")
@Expose
private String processingMode;
@SerializedName("merchant_account_id")
@Expose
private Object merchantAccountId;

public Tarjeta() {
}

public String getId() {
    return id;
}

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

public String getName() {
    return name;
}

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

public String getSecureThumbnail() {
    return secureThumbnail;
}

public void setSecureThumbnail(String secureThumbnail) {
    this.secureThumbnail = secureThumbnail;
}

public String getThumbnail() {
    return thumbnail;
}

public void setThumbnail(String thumbnail) {
    this.thumbnail = thumbnail;
}

public String getProcessingMode() {
    return processingMode;
}

public void setProcessingMode(String processingMode) {
    this.processingMode = processingMode;
}

public Object getMerchantAccountId() {
    return merchantAccountId;
}

public void setMerchantAccountId(Object merchantAccountId) {
    this.merchantAccountId = merchantAccountId;
}

@Override
public String toString() {
    return "Tarjeta{" +
            "id='" + id + '\'' +
            ", name='" + name + '\'' +
            ", secureThumbnail='" + secureThumbnail + '\'' +
            ", thumbnail='" + thumbnail + '\'' +
            ", processingMode='" + processingMode + '\'' +
            ", merchantAccountId=" + merchantAccountId +
            '}';
}

}

这是我的 GET 方法

@GET("payment_methods/card_issuers")
Call<Tarjeta> getTarjetas2(@Query("public_key") String apiKey,
                           @Query("payment_method_id") String payment_method_id);

这就是我尝试阅读的地方。

botonTest2.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
      System.out.println("Test boton 2 clickeado");
      Retrofit retrofit = new Retrofit.Builder()
              .baseUrl(BASE_URL)
              .addConverterFactory(GsonConverterFactory.create())
              .build();

      ServicePago servicePago = retrofit.create(ServicePago.class);
      Call<Tarjeta> contenedorTarjetaCall = servicePago.getTarjetas2(apiKey,"visa");

      contenedorTarjetaCall.enqueue(new Callback<Tarjeta>() {
          @Override
          public void onResponse(Call<Tarjeta> call, Response<Tarjeta> response) {
              Toast.makeText(MainActivity.this, "BIEN", Toast.LENGTH_SHORT).show();

          }

          @Override
          public void onFailure(Call<Tarjeta> call, Throwable t) {
              Toast.makeText(MainActivity.this, "ALGO SALIO MAL", Toast.LENGTH_SHORT).show();
          }
      });
  }

});

我遇到了这个错误:java.lang.IllegalStateException:预期为BEGIN_OBJECT，但在第1行第2列路径$处为BEGIN_ARRAY

我认为我的类(class)建模正确，但我完全迷失了。

Answer 1

由于您没有发布完整的 JSON，我将回答一个粗略的想法，希望它有所帮助。

错误表明接收到的 JSON 不是 Tarjeta，而是 Tarjeta 数组。所以要解决这个问题，我想您只需将您的响应包装在列表类型中即可。所以事情是这样的:

@GET("payment_methods/card_issuers")
Call<List<Tarjeta>> getTarjetas2(@Query("public_key") String apiKey,
                           @Query("payment_method_id") String payment_method_id);