Datendownload von API error

Question

Ich habe versucht, meine Daten von api wie diese

private List<Question> downloadQuestion; 
     Call<Questions> questionCall = MainApi.createService(MainService.class). 
      getQuestionsByChapIdAndType("15", 2); 
    questionCall.enqueue(new Callback<Questions>() { 
     @Override 
     public void onResponse(Response<Questions> response, Retrofit retrofit) { 
      downloadQuestion.addAll(response.body().getQuestions()); 
      Log.d("Size",":"+downloadQuestion.size()); 
     } 
     @Override 
     public void onFailure(Throwable t) { 
      Log.d("Size",t.toString()); 
     } 
    }); 

Aber diese zeigen diese Fehlermeldung

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 28 path $.questions 

Helfen Sie mir zu lösen dieses Problem herunterzuladen. Das ist meine Frage.java.

public class Question { 

@SerializedName("chapter_id") 
private int chapter_id; 

@SerializedName("question_type_id") 
private int question_type_id; 

@SerializedName("question") 
private String question; 

@SerializedName("hint1") 
private String hint1; 

@SerializedName("hint2") 
private String hint2; 

@SerializedName("hint3") 
private String hint3; 

@SerializedName("hint4") 
private String hint4; 

@SerializedName("answer") 
private String answer; 

@SerializedName("year") 
private int year; 

public String getQuestion() { 
    return question; 
} 

public String getHint1() { 
    return hint1; 
} 

public String getHint2() { 
    return hint2; 
} 

public String getHint3() { 
    return hint3; 
} 

public String getHint4() { 
    return hint4; 
} 

public String getAnswer() { 
    return answer; 
} 

public int getChapter_id() { 
    return chapter_id; 
} 

public int getQuestion_type_id() { 
    return question_type_id; 
} 

public int getYear() { 
    return year; 
} 

public Question(String question, String hint1, String hint2, String hint3, String hint4, String answer) { 
    this.question = question; 
    this.hint1 = hint1; 
    this.hint2 = hint2; 
    this.hint3 = hint3; 
    this.hint4 = hint4; 
    this.answer = answer; 
} 
} 

und das ist meine Fragen.java.

public class Questions { 

@SerializedName("questions") 
private List<Question> questions; 

public List<Question> getQuestions() { 
    return questions; 
} 
} 

Dies ist mein MainApi.

@GET("questions/{chapter_id}/{question_type_id}") 
Call<Questions> getQuestionsByChapIdAndType(@Path("chapter_id") String chapter_id, @Path("question_type_id") int question_type_id); 

MyApi Image

Ich weiß nicht, warum dies geschieht. bitte hilf mir. ich bin sehr neu zu android

Answer 1

Ihre API-Rückgabeobjekt, aber in Questions.class rufen Sie Liste < Fragen>.

public class Questions { 

@SerializedName("questions") 
private List<Question> questions; 

public List<Question> getQuestions() { 
return questions; 
} 
} 

Versuchen Sie das !!!

public class Questions { 

@SerializedName("questions") 
private Question questions; 

} 
}