response.body返回NULL使用改裝：2.3.0

Question

的json數據是這個

{ 
    "data":[ 
     { 
      "id":"4", 
      "totalOpns":"40000", 
      "killedDrugPer":"320", 
      "arrestedDrugPer":"17683", 
      "houseVisited":"4000", 
      "userSurrenderers":"45000", 
      "pusherSurrenderers":"15000", 
      "totalSurrenderers":"60000", 
      "killedPNPPerOpns":"40", 
      "woundedPNPPerOpns":"70", 
      "killedAFPPerOpns":"100", 
      "woundedAFPPerOpns":"10", 
      "date":"2017-07-12 13:57:34.000" 
     } 
    ] 
} 

和我的數據模型是這樣的

package com.androidtutorialpoint.retrofitandroid; 

import com.google.gson.annotations.Expose; 
import com.google.gson.annotations.SerializedName; 
import java.io.Serializable; 

public class Student implements Serializable { 

    //Variables that are in our json 

    @SerializedName("id") 
    @Expose 
    private String id; 
    @SerializedName("totalOpns") 
    @Expose 
    private String totalOpns; 
    @SerializedName("killedDrugPer") 
    @Expose 
    private String killedDrugPer; 
    @SerializedName("arrestedDrugPer") 
    @Expose 
    private String arrestedDrugPer; 
    @SerializedName("houseVisited") 
    @Expose 
    private String houseVisited; 
    @SerializedName("userSurrenderers") 
    @Expose 
    private String userSurrenderers; 
    @SerializedName("pusherSurrenderers") 
    @Expose 
    private String pusherSurrenderers; 
    @SerializedName("totalSurrenderers") 
    @Expose 
    private String totalSurrenderers; 
    @SerializedName("killedPNPPerOpns") 
    @Expose 
    private String killedPNPPerOpns; 
    @SerializedName("woundedPNPPerOpns") 
    @Expose 
    private String woundedPNPPerOpns; 
    @SerializedName("killedAFPPerOpns") 
    @Expose 
    private String killedAFPPerOpns; 
    @SerializedName("woundedAFPPerOpns") 
    @Expose 
    private String woundedAFPPerOpns; 
    @SerializedName("date") 
    @Expose 
    private String date; 

    public String getId() { 
     return id; 
    } 

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

    public String getTotalOpns() { 
     return totalOpns; 
    } 

    public void setTotalOpns(String totalOpns) { 
     this.totalOpns = totalOpns; 
    } 

    public String getKilledDrugPer() { 
     return killedDrugPer; 
    } 

    public void setKilledDrugPer(String killedDrugPer) { 
     this.killedDrugPer = killedDrugPer; 
    } 

    public String getArrestedDrugPer() { 
     return arrestedDrugPer; 
    } 

    public void setArrestedDrugPer(String arrestedDrugPer) { 
     this.arrestedDrugPer = arrestedDrugPer; 
    } 

    public String getHouseVisited() { 
     return houseVisited; 
    } 

    public void setHouseVisited(String houseVisited) { 
     this.houseVisited = houseVisited; 
    } 

    public String getUserSurrenderers() { 
     return userSurrenderers; 
    } 

    public void setUserSurrenderers(String userSurrenderers) { 
     this.userSurrenderers = userSurrenderers; 
    } 

    public String getPusherSurrenderers() { 
     return pusherSurrenderers; 
    } 

    public void setPusherSurrenderers(String pusherSurrenderers) { 
     this.pusherSurrenderers = pusherSurrenderers; 
    } 

    public String getTotalSurrenderers() { 
     return totalSurrenderers; 
    } 

    public void setTotalSurrenderers(String totalSurrenderers) { 
     this.totalSurrenderers = totalSurrenderers; 
    } 

    public String getKilledPNPPerOpns() { 
     return killedPNPPerOpns; 
    } 

    public void setKilledPNPPerOpns(String killedPNPPerOpns) { 
     this.killedPNPPerOpns = killedPNPPerOpns; 
    } 

    public String getWoundedPNPPerOpns() { 
     return woundedPNPPerOpns; 
    } 

    public void setWoundedPNPPerOpns(String woundedPNPPerOpns) { 
     this.woundedPNPPerOpns = woundedPNPPerOpns; 
    } 

    public String getKilledAFPPerOpns() { 
     return killedAFPPerOpns; 
    } 

    public void setKilledAFPPerOpns(String killedAFPPerOpns) { 
     this.killedAFPPerOpns = killedAFPPerOpns; 
    } 

    public String getWoundedAFPPerOpns() { 
     return woundedAFPPerOpns; 
    } 

    public void setWoundedAFPPerOpns(String woundedAFPPerOpns) { 
     this.woundedAFPPerOpns = woundedAFPPerOpns; 
    } 

    public String getDate() { 
     return date; 
    } 

    public void setDate(String date) { 
     this.date = date; 
    } 
} 

和接口是該

package com.androidtutorialpoint.retrofitandroid; 

import retrofit2.Call; 
import retrofit2.http.GET; 

public interface RetrofitObjectAPI { 

/* 
* Retrofit get annotation with our URL 
* And our method that will return us details of student. 
*/ 
// @GET("JSONTESTING/index.php") 
@GET("getJson") 
Call<Student> getStudentDetails(); 
} 

在我的主要是這個

private void getRetrofitObject() { 
    HttpLoggingInterceptor.Level logLevel = HttpLoggingInterceptor.Level.BODY; 

    HttpLoggingInterceptor logging = new HttpLoggingInterceptor(); 
    // set your desired log level 
    logging.setLevel(logLevel); 

    OkHttpClient.Builder httpClient = new OkHttpClient.Builder(); 
    // add your other interceptors … 

    // add logging as last interceptor 
    httpClient.addInterceptor(logging); // <-- this is the important line! 

    Retrofit retrofit = new Retrofit.Builder() 
     .baseUrl(url) 
     .addConverterFactory(GsonConverterFactory.create()) 
     .client(httpClient.build()) 
     .build(); 

    RetrofitObjectAPI service = retrofit.create(RetrofitObjectAPI.class); 

    Call<Student> call = service.getStudentDetails(); 

    call.enqueue(new Callback<Student>() { 
    @Override 
     public void onResponse(Call<Student> call, Response<Student> response) { 
      try { 
       if (response.isSuccessful()) { 
        text_id_1.setText("StudentId : " + response.body().getId()); 
        text_name_1.setText("StudentName : " + response.body().getTotalOpns()); 
        text_marks_1.setText("StudentMarks : " + response.body().getArrestedDrugPer()); 
       } else { 
        //unsuccessful response 
       } 
      } catch (Exception e) { 
       Log.d("onResponse", "There is an error"); 
       e.printStackTrace(); 
      } 
     } 

     @Override 
     public void onFailure(Call<Student> call, Throwable t) { 
      Log.d("onFailure", t.toString()); 
     } 
    }); 
} 

並在我的logcat是這樣的，我可以看到json數據但在我的response.body返回null。
logcat

我該怎麼辦？

Answer 1

您已收到回覆，但在反序列化中存在問題。 原因是Call<Student>不是它會被序列化的類型，因爲你得到了學生名單（JSONArray）。

添加此類

MyResponse

public class MyResponse { 

@SerializedName("data") 
@Expose 
private List<Student> data = null; 

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

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

} 

，並改變你的調用：

@GET("getJson") 
Call<MyResponse> getStudentDetails(); 

現在你會得到響應體 以及如何以檢索？

List<Student> students = response.body().getData(); 

這樣做.. :)