Parcelable with List 仅反序列化第一个元素

Question

我有一个包含 Parcelable 对象列表的 Parcelable 对象。在从一个 Activity 传递到下一个后，我试图读回该列表，但只有第一个元素是 "un-bundled"

public class MyBundle implements Parcelable {
    private List<Data> dataList;

    public static final Parcelable.Creator<MyBundle> CREATOR = new Parcelable.Creator<MyBundle>() {
        public MyBundle createFromParcel(Parcel in) {
            return new MyBundle(in);
        }

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

    public MyBundle() {
    }

    public MyBundle(Parcel in) {
        //dataList = new ArrayList<>();
        //in.readTypedList(dataList, Data.CREATOR);
        dataList = in.createTypedArrayList(Data.CREATOR);
        //BOTH have the same result
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        if (dataList != null && dataList.size() > 0) {
            dest.writeTypedList(dataList);
        }
    }
}

数据对象：

/*BaseObject has the following properties:
    UUID uuid;
    long databaseId;
    createdDate;
    modifiedDate;
*/
public class Data extends BaseObject implements Parcelable {
    private String name;
    private String serial;
    private String location;

    public Data() {}

    private Data(Parcel in) {
        String uuidString = in.readString();
        if (uuidString == null) return; //this is null!
        uuid = UUID.fromString(idString);
        databaseId = in.readLong();
        createdDate = new Date(in.readLong());
        modifiedDate = new Date(in.readLong());
        location = in.readString();

        name = in.readString();
        serial = in.readString();
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(uuid.toString());
        dest.writeLong(databaseId);
        dest.writeLong(createdDate.getTime());
        dest.writeLong(modifiedDate.getTime());

        dest.writeString(name);
        dest.writeString(serial);
    }

    public static final Parcelable.Creator<Data> CREATOR
            = new Parcelable.Creator<Data>() {
        public Data createFromParcel(Parcel in) {
            return new Data(in);
        }

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

我尝试过的：

调试 - 我可以看到第一个元素读取正常，但其余元素 return 为空，并且它们在写入时确实有值
"Android, How to use readTypedList method correctly in a Parcelable class?"
"how to properly implement Parcelable with an ArrayList?"

Answer 1

这就是答案：我的数据 parcelable 在创建包裹时缺少位置元素。当 READING 发生时，这显然会导致某种偏移错误。所以编码方案如下：

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(uuid.toString());
        dest.writeLong(databaseId);
        dest.writeLong(createdDate.getTime());
        dest.writeLong(modifiedDate.getTime());
        dest.writeString(location); /*HERE!*/
        dest.writeString(name);
        dest.writeString(serial);
    }

我希望这对其他人有帮助。

Parcelable with List 仅反序列化第一个元素

Parcelable with List only deserialises first element

android

bundle