在我的练习课中,我有一个 2D ArrayList。我已经设法使用 Parcelable 将所有字段从 Activity 传递到另一个字段。但是,我不知道如何使用 Parcelable 在我的对象中传递 2D ArrayList。
public class Exercise implements Parcelable{
private String name, equipmentRequired;
private ArrayList musclesWorked;
private HashMap personalBest;
private boolean selected;
private float minAccelLevel, minAccelChanges;
private ArrayList<ArrayList<Double>> sets = new ArrayList<>();
...
private Exercise(Parcel in) {
name = in.readString();
equipmentRequired = in.readString();
musclesWorked = in.readArrayList(ArrayList.class.getClassLoader());
personalBest = in.readHashMap(HashMap.class.getClassLoader());
selected = in.readInt() != 0;
// sets = ???????
}
public static final Parcelable.Creator<Exercise> CREATOR = newParcelable.Creator<Exercise>() {
public Exercise createFromParcel(Parcel in) {
return new Exercise(in);
}
public Exercise[] newArray(int size) {
return new Exercise[size];
}
};
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(name);
dest.writeString(equipmentRequired);
dest.writeList(musclesWorked);
dest.writeMap(personalBest);
dest.writeInt(selected ? 1 : 0);
// ?????
}
}
最佳答案
根据 Google Documentation还有这个other question , 我建议去
private Exercise(Parcel in) {
name = in.readString();
equipmentRequired = in.readString();
musclesWorked = in.readArrayList(ArrayList.class.getClassLoader());
personalBest = in.readHashMap(HashMap.class.getClassLoader());
selected = in.readInt() != 0;
sets = in.readArrayList(null);
}
这是因为,正如文档所述:
The given class loader will be used to load any enclosed Parcelables.
关于java - 如何使用 Parcelable 传递带有 2D ArrayList 字段的自定义对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42984872/