Android 使用改装库获取时出错

我在MainActivity中创建了一个函数，按下刷新按钮时调用该函数

public void callWeatherAPI(){

        SharedPreferences SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());

        final String strUserName = SP.getString("username", "NA");
        int defaultval = Integer.parseInt(strUserName);




        WeatherAPI weatherAPI = APIHandler.getApiInterface();
        weatherAPI.getWeatherCity(defaultval, new Callback<StudentData>() {

            public void success(final StudentData arg0, Response arg1) {

                Toast.makeText(getApplicationContext(), arg0.getStudentName(), Toast.LENGTH_LONG).show();
               // Toast.makeText(getApplicationContext(), WeatherData.getWeatherCity().getDescription(), Toast.LENGTH_LONG).show();

            }

            public void failure(RetrofitError arg0) {

                Toast.makeText(getApplicationContext(), "OPS, some kind of problem had happend! :(", Toast.LENGTH_LONG).show();
            }
        });
    }
}

json是谁的

{"success":1,"student":[{"exam_roll":"1212","class_no":"121","block_no":"1221","name":"rohit"}]}    

我已将回调函数设置为指向StudentData类

public interface WeatherAPI {

//@GET("/weather")
@GET("/")

void getWeatherCity(@Query("pid") int pid, Callback<MainActivity.StudentData> callback);

编辑： 问题出在StudentData类中。 您必须创建这样的类，而不是Student实例：

public static class StudentData { 
    List<Student> student;
    public int success;
    ...
} 

公共静态类StudentData{
列出学生名单；
公众的成功；
...
} 

JSON清楚地表明，带有“student”键的元素是一个student实例数组。

请使用site生成您的模型。
学生数据：

public class StudentData {

@Expose
private Integer success;
@Expose
private List<Student> student = new ArrayList<Student>();

/**
* 
* @return
* The success
*/
public Integer getSuccess() {
return success;
}

/**
* 
* @param success
* The success
*/
public void setSuccess(Integer success) {
this.success = success;
}

/**
* 
* @return
* The student
*/
public List<Student> getStudent() {
return student;
}

/**
* 
* @param student
* The student
*/
public void setStudent(List<Student> student) {
this.student = student;
}

}

public class Student {

@SerializedName("exam_roll")
@Expose
private String examRoll;
@SerializedName("class_no")
@Expose
private String classNo;
@SerializedName("block_no")
@Expose
private String blockNo;
@Expose
private String name;

/**
* 
* @return
* The examRoll
*/
public String getExamRoll() {
return examRoll;
}

/**
* 
* @param examRoll
* The exam_roll
*/
public void setExamRoll(String examRoll) {
this.examRoll = examRoll;
}

/**
* 
* @return
* The classNo
*/
public String getClassNo() {
return classNo;
}

/**
* 
* @param classNo
* The class_no
*/
public void setClassNo(String classNo) {
this.classNo = classNo;
}

/**
* 
* @return
* The blockNo
*/
public String getBlockNo() {
return blockNo;
}

/**
* 
* @param blockNo
* The block_no
*/
public void setBlockNo(String blockNo) {
this.blockNo = blockNo;
}

/**
* 
* @return
* The name
*/
public String getName() {
return name;
}

/**
* 
* @param name
* The name
*/
public void setName(String name) {
this.name = name;
}

}

---

{“成功”：1，“学生”：[{“考试卷”：“1212”，“班级号”：“121”，“班级号”：“1221”，“姓名”：“rohit”}}}里面有一个数组！我知道，我看到了JSON。但可能原始JSON的结构与此不同。你试过列表回调吗？我试过上面发布的代码我得到了json成功的结果现在我正在努力如何访问数组对象，即考试卷，课程号。哦，现在我知道问题出在哪里了…看看我的答案的编辑好的，我已经按照你在本课程中说的那样成功了（List studentDatas，Response Response）{}如何访问json数据？我还没有使用List much您能告诉我如何检索name public void success（final StudentData StudentData，Response arg1）{Log.d（“Debug”，StudentData.student.get（0））；}我得到空点，除了

Log.d（“调试”，studentData.student.get（0））；

，然后执行以下操作：

Log.d（“调试”，studentData）；

并显示结果它不适用！Log.d需要string@ShresthaRohit，Log.d（“调试”，studentData+”）；d/Debug﹕ ku.example.com.seatplanku.main活动$StudentData@b2fc3010

public class StudentData {

@Expose
private Integer success;
@Expose
private List<Student> student = new ArrayList<Student>();

/**
* 
* @return
* The success
*/
public Integer getSuccess() {
return success;
}

/**
* 
* @param success
* The success
*/
public void setSuccess(Integer success) {
this.success = success;
}

/**
* 
* @return
* The student
*/
public List<Student> getStudent() {
return student;
}

/**
* 
* @param student
* The student
*/
public void setStudent(List<Student> student) {
this.student = student;
}

}

public class Student {

@SerializedName("exam_roll")
@Expose
private String examRoll;
@SerializedName("class_no")
@Expose
private String classNo;
@SerializedName("block_no")
@Expose
private String blockNo;
@Expose
private String name;

/**
* 
* @return
* The examRoll
*/
public String getExamRoll() {
return examRoll;
}

/**
* 
* @param examRoll
* The exam_roll
*/
public void setExamRoll(String examRoll) {
this.examRoll = examRoll;
}

/**
* 
* @return
* The classNo
*/
public String getClassNo() {
return classNo;
}

/**
* 
* @param classNo
* The class_no
*/
public void setClassNo(String classNo) {
this.classNo = classNo;
}

/**
* 
* @return
* The blockNo
*/
public String getBlockNo() {
return blockNo;
}

/**
* 
* @param blockNo
* The block_no
*/
public void setBlockNo(String blockNo) {
this.blockNo = blockNo;
}

/**
* 
* @return
* The name
*/
public String getName() {
return name;
}

/**
* 
* @param name
* The name
*/
public void setName(String name) {
this.name = name;
}

}