使用自定义 Parcelable 对象在 Arraylist 上解组异常答案

【问题标题】：Unmarshalling exception on Arraylist with a custom Parcelable Object使用自定义 Parcelable 对象在 Arraylist 上解组异常
【发布时间】：2016-12-30 09:13:42
【问题描述】：

我正在为数据数组（来自 json）对象创建 DTO 并实现 parcelable 以将 DTO 的数组列表发送到另一个类，但我面临

在此问题的偏移量 476 处解组未知类型代码 7471216

。我认为 List answers read\write parcelling 存在一些问题。我无法找到错误。我正在发送我的数组列表，例如intent.putParcelableArrayListExtra("xxxxx", MyList);，但是在获取另一个活动时，我收到了上述错误。请帮忙。

response{
 "errorMessage": null,
 "status": true,
 "data": [
   {
    "id": "xxxx",
    "question": "Why is your xxxx?",
    "isMandatory": true,
    "typeOfQuestion": "OPEN",
    "answers": [

  ],
  "active": true
},
{
    "id": "xxxxx",
    "question": "what is your name",
    "isMandatory": true,
    "typeOfQuestion": "OPEN",
    "answers": [

   ],
   "active": true
  }
 ],
 "httpStatus": 200
}

Parcelable 类：

 public class QuestionAnswerDto implements Parcelable {
 private String id;
 private String question;
 private String isMandatory;
 private String typeOfQuestion;
 private String active;
 private List<String> answers;

 public String getId() {
    return id;
 }

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

public String getQuestion() {
    return question;
}

public void setQuestion(String question) {
    this.question = question;
}

public String getIsMandatory() {
    return isMandatory;
}

public void setIsMandatory(String isMandatory) {
    this.isMandatory = isMandatory;
}

public String getTypeOfQuestion() {
    return typeOfQuestion;
}

public void setTypeOfQuestion(String typeOfQuestion) {
    this.typeOfQuestion = typeOfQuestion;
}

public String getActive() {
    return active;
}

public void setActive(String active) {
    this.active = active;
}

public List<String> getAnswers() {
    return answers;
}

public void setAnswers(List<String> answers) {
    this.answers = answers;
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(this.id);
    dest.writeString(this.question);
    dest.writeString(this.typeOfQuestion);
    dest.writeString(this.active);
    dest.writeString(this.isMandatory);
    dest.writeStringList(this.answers);

}


protected QuestionAnswerDto(Parcel in) {
    this.id = in.readString();
    this.question = in.readString();
    this.typeOfQuestion = in.readString();
    this.active = in.readString();

    this.answers = new ArrayList<>();
    in.readStringList(this.answers);
    this.isMandatory = in.readString();
}



   public static final Creator<QuestionAnswerDto> CREATOR = new     Creator<QuestionAnswerDto>() {
    public QuestionAnswerDto createFromParcel(Parcel source) {
        return new QuestionAnswerDto(source);
    }

    public QuestionAnswerDto[] newArray(int size) {
        return new QuestionAnswerDto[size];
    }
  };

  }

【问题讨论】：

请在活动中提及获取数组列表的代码。
@sharma.mashes，查看您的个人资料，我注意到您几乎从不接受答案。如果他们帮助您解决问题，您应该接受更多答案。如果你这样做，你可能会帮助其他有同样问题的人。
肯定会的 ..@Rolfツ

标签： android arraylist parcelable parcel

【解决方案1】：

您的书写和阅读顺序不正确。使用 Parcels 序列化和反序列化对象时，您必须按照与写入对象相同的顺序读取。

请参阅下面的更正代码（我移动了QuestionAnswerDto 构造函数中的最后一行）：

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(this.id);
    dest.writeString(this.question);
    dest.writeString(this.typeOfQuestion);
    dest.writeString(this.active);
    dest.writeString(this.isMandatory);
    dest.writeStringList(this.answers);
}


protected QuestionAnswerDto(Parcel in) {
    this.id = in.readString();
    this.question = in.readString();
    this.typeOfQuestion = in.readString();
    this.active = in.readString();
    this.isMandatory = in.readString();
    this.answers = new ArrayList<>();
    in.readStringList(this.answers);
}

【讨论】：