如何在parcelable android studio java中传递一个以抽象类类型为参数的类

Question

我正试图将这个类作为android中的parcelable来传递。

public class Outfit implements Parcelable {
private List<Item> itemList;
private String mName;
private String mImageUrl;
public Outfit() {}
public Outfit(String mName, String mImageUrl) {
this.mName = mName;
this.mImageUrl = mImageUrl;
}
protected Outfit(Parcel in) {
itemList = in.createTypedArrayList(Item.CREATOR);
mName = in.readString();
mImageUrl = in.readString();
}
public static final Creator<Outfit> CREATOR = new Creator<Outfit>() {
@Override
public Outfit createFromParcel(Parcel in) {
return new Outfit(in);
}
@Override
public Outfit[] newArray(int size) {
return new Outfit[size];
}
};
public String getmName() {
return mName;
}
public String getmImageUrl() {
return mImageUrl;
}
@Override
public String toString() {
return mName;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int i) {
parcel.writeTypedList(itemList);
parcel.writeString(mName);
parcel.writeString(mImageUrl);
}
}

问题是Item是抽象的，并且itemList=in.creatTypedArrayList(Item.CREATOR(，因为Item没有CREATOR。只有它的子类具有此实现。

项目.java

public abstract class Item implements Parcelable {
private String mName;
private String mColor;
private String mImageUrl;
private List<TagHolder> tags = new ArrayList<>();
private String mKey;
public Item(){
}
public Item(String mName, String mColor, String mImageUrl) {
this.mName = mName;
this.mColor = mColor;
this.mImageUrl = mImageUrl;
}
protected Item(Parcel in) {
mName = in.readString();
mColor = in.readString();
mImageUrl = in.readString();
tags = in.createTypedArrayList(TagHolder.CREATOR);
mKey = in.readString();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(mName);
dest.writeString(mColor);
dest.writeString(mImageUrl);
dest.writeTypedList(tags);
dest.writeString(mKey);
}
@Override
public int describeContents() {
return 0;
}

public void setmName(String mName) {
this.mName = mName;
}
public void setmImageUrl(String mImageUrl) {
this.mImageUrl = mImageUrl;
}
public List<TagHolder> getTags() {
return tags;
}
public String getmColor() {
return mColor;
}
public String getmImageUrl() {
return mImageUrl;
}
public void setmColor(String mColor) {
this.mColor = mColor;
}
public String getmName() {
return mName;
}
public void setTags(List<TagHolder> tags) {
this.tags = tags;
}
@Exclude // dont need this in our firebase database
public String getKey() {
return mKey;
}
@Exclude
public void setMkey(String key) {
mKey = key;
}
public abstract String getCategory();
}

当我调用put extra时，我可以将List作为可分组数组进行分组。但当我试着这样做的服装，它给出了错误。有没有办法把Outfit作为一个可传球的球员？

Answer 1

您是否尝试使用其他方法处理列表？

@Override
public void writeToParcel(Parcel parcel, int i) {
parcel.writeList(itemList);
parcel.writeString(mName);
parcel.writeString(mImageUrl);
}
protected Outfit(Parcel in) {
in.readList(itemList, Item.class.getClassLoader());
mName = in.readString();
mImageUrl = in.readString();
}