java.lang.ClassCastException: java.lang.String 在实现 parcelable 时不能转换为

Question

我运行想不通为什么我的 parcelable 实现会抛出 ClassCastException。我想知道为什么它会抛出异常并找到解决方法 it.Please 如果我仍然缺乏提供信息以便你们帮助我，请告诉我。

IdModelDTO class

public class IdModelDTO implements Parcelable {
private String type;
private String surname;
private String givenName;
private String middleName;
private String birthDate;

protected IdModelDTO(Parcel in) {
    givenName = in.readString();
    middleName = in.readString();
    surname = in.readString();
    birthDate = in.readString();
    type = in.readString();
} 
public static final Creator<IdModelDTO> CREATOR = new Creator<IdModelDTO(){
    @Override
    public IdModelDTO createFromParcel(Parcel in) {
        return new IdModelDTO(in);
    }

    @Override
    public IdModelDTO[] newArray(int size) {
        return new IdModelDTO[size];
    }
};

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

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(givenName);
    dest.writeString(middleName);
    dest.writeString(surname);
    dest.writeString(birthDate);
    dest.writeString(type);
}

@Override
public String toString() {
    return "IdModelDTO{" + "givenName='" + givenName + '\''
            + ", middleName='" + middleName + '\'' +
            "surname='" + surname + '\'' +
            "birthdate=''" + birthDate + '\'' +
            "type='" + type +  '\'' + '}';
}

这是我将它作为捆绑包使用的地方。我什至可以在将它发送到下一个 activity:

之前将其记录为一个包

public void checkMplusRespCodes() {
        // Check if response codes are OK/Created:
        if(governmentIdRespCode == null){
            Log.d(TAG, "Government Id Response code: " + governmentIdRespCode );
        }
        if(saveSelfieResponse == null){
            Log.d(TAG, "saveSelfieResponse: " + saveSelfieResponse);
        }
        else if(governmentIdRespCode != null && saveSelfieResponse != null){
            if(governmentIdRespCode.equals("200") && saveSelfieResponse.equals("200")){
                //Create bundle here, then pass it to view:
                //Bundle idModelBundle = new Bundle();
                //idModelBundle.putParcelable(THISIDMODEL, thisIdModel);
                //viewContract.showNextActivity(idModelBundle);
                Log.d(TAG, " checkMplusRespCodes: " + idModelDTO.toString());
                Bundle idModelBundle = new Bundle();
                idModelBundle.putParcelable(THISIDMODEL, idModelDTO);
                viewContract.showDoneLoading();
                viewContract.showNextActivity(idModelBundle);
            }
        }

然后在下一个activity，它抛出 ClassCastException:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test1);
    /* */
    Intent previousIntent = getIntent();
    if(previousIntent.getExtras() != null){
        Bundle previousExtras = previousIntent.getExtras();
        if(previousExtras != null){
            IdModelDTO test = previousIntent.getParcelableExtra(THISIDMODEL);
            if(test != null){
                Log.d(TAG, " asd: " + test.toString());
            }
            /* Retrieve: */
        }
    }else{
        //proceed.
    }

我们将不胜感激任何形式的帮助。

编辑： 这是方法的日志，而我将 Parcelable 对象设置为一个包：

checkMplusRespCodes: IdModelDTO{givenName='test', middleName='asd'surname='Test'birthdate=''axx'type='asxd'}

异常发生在正在投射的 nextActivity 中：

IdModelDTO test = previousIntent.getParcelableExtra(THISIDMODEL);

Answer 1

用这个替换你的代码

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test1);
    /* */
    Intent previousIntent = getIntent();
    if(previousIntent.getExtras() != null){
        Bundle previousExtras = previousIntent.getExtras();
        if(previousExtras != null){
            IdModelDTO test = previousExtras.getParcelable(THISIDMODEL);
            if(test != null){
                Log.d(TAG, " asd: " + test.toString());
            }
            /* Retrieve: */
        }
    }else{
        //proceed.
    }

Answer 2

我认为您正在尝试解析 date 不是 String 的对象。

这就是您收到此异常的原因。

Answer 3

好的，我解决了这个问题。正如您在这一行中看到的那样，我将一个 Bundle 对象传递到我的自定义 IdModelDTO 中：

if(previousExtras != null){
        IdModelDTO test = previousIntent.getParcelableExtra(THISIDMODEL);
        ...

我删除了将我的对象放入包中的 Bundle 部分，并使用 putExtra 以便我能够按类型检索对象：

Intent nextActivityIntent = new Intent(this, TestActivityX.class);
nextActivityIntent.putExtra(THISIDMODEL,idModelDTO);
Log.d(TAG, " Show next activity: " + idModelDTO.toString());
startActivity(nextActivityIntent);

然后检索将在下一个activity:

Intent previousIntent = getIntent();
    if (previousIntent.getExtras() != null) {
        Bundle previousExtras = previousIntent.getExtras();
        if (previousExtras != null) {
            // Retrieve:
            if (previousExtras.containsKey(THISIDMODEL)) {
                // Re-instanciate new user.
                IdModelDTO test = previousExtras.getParcelable(THISIDMODEL);
                Log.d(TAG, " Previous Details:" + test.toString());
            }
        }
    }

谢谢大家，非常感谢您的评论。

java.lang.ClassCastException: java.lang.String 在实现 parcelable 时不能转换为

java.lang.ClassCastException: java.lang.String cannot be cast to when implementing parcelable

java

android

classcastexception