使用Retrofit Library获取时出错

Question

我在MainActivity中创建了一个函数，当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();
            }
        });
    }
}

在MainActivity中创建了一个静态类

public static class Student{
    public String exam_roll;
    public String class_no;
    public String block_no;
    public String name;

}
public static class StudentData{
    Student student;
    public int success;


    public int getStudentName() {
        return success;
    }
}

谁是json

{"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);

}

不知道这有什么问题，它会返回改装错误功能

改造时的错误是

java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 25

Answer 1

请使用jsonschema2pojo网站生成模型 的 StudentData ：

angular.module('thisApp', [someDependencies]).config( function($stateProvider, $urlRouteProvider) {
    $http.get('url').then(function(response) {
        var alpha = response.data; // i need to access this data in the controller
    )};
}).directive('pqrTitle', function () {
    return {
        restrict: 'A',
        controller: function($scope, $rootScope) {

        // I need to access alpha here
    });
});

<强>学生：

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;
}

}

Answer 2

修改 问题出在StudentData类中。 而不是学生的实例，你必须像这样创建类：

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

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