Question

我刚刚发布了this question，有人建议我再看一下。在另一个答案中，它告诉我将枚举作为Serializable放入包裹中。（如果你现在不知道我在说什么，请阅读上面的帖子。）我试着这样做：

protected QuestionOptions(Parcel in) {
    digitCount = in.readInt ();
    operationType = (OperationType)in.readSerializable ();
    boolean[] array = new boolean[1];
    in.readBooleanArray (array);
    timerEnabled = array[0];
}

public static final Creator<QuestionOptions> CREATOR = new Creator<QuestionOptions> () {
    @Override
    public QuestionOptions createFromParcel(Parcel in) {
        return new QuestionOptions (in);
    }

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

public QuestionOptions (OperationType operationType, int digitCount, boolean timerEnabled) {
    this.operationType = operationType;
    this.digitCount = digitCount;
    this.timerEnabled = timerEnabled;
}

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

@Override
public void writeToParcel(Parcel dest, int flags) {
    boolean[] array = {timerEnabled};
    dest.writeBooleanArray (array);
    dest.writeInt (digitCount);
    dest.writeSerializable (operationType);
}

当我运行我的应用时，它会在行中的RuntimeException崩溃：

operationType = (OperationType)in.readSerializable ();

QuestionOptions(Parcel in)构造函数中的

。错误说“Parcelable遇到读取Serializable对象（name =）的IOException”。我尝试在SO上搜索这个，然后我看到this question但是这是关于使用列表而且我有一个枚举。我怎么能这样做？

Answer 1

你必须按照你编写的顺序读取Parcel对象中的内容。首先是布尔数组，第二个是int，然后是枚举值。此

protected QuestionOptions(Parcel in) {
    boolean[] array = new boolean[1];
    in.readBooleanArray (array);
    timerEnabled = array[0];
    digitCount = in.readInt ();
    operationType = (OperationType)in.readSerializable ();
 }

应该这样做

Answer 2

就像Blackbelt提到的那样，读/写顺序很重要。

您可以使用枚举的String表示形式将其写入parcel。要编写布尔变量，可以使用writeByte（）。我把你上一篇文章的答案放在这里：

protected QuestionOptions(Parcel in) {
    this.operationType = OperationType.valueOf(in.readString());
    this.digitCount = in.readInt();
    this.timerEnabled = in.readByte() != 0;
}

和

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(this.operationType.name());
    dest.writeInt(this.digitCount);
    dest.writeByte((byte) (this.timerEnabled ? 1 : 0));
}

将枚举写入包导致RuntimeException

2 个答案: