How to make a class with nested objects Parcelable
At Write to parcel
@Override
public void writeToParcel(Parcel parcel, int i) {
parcel.writeString(name); //if String
parcel.writeTypedList(assignedEmployees); //if List with custom class, eg. List<AssignedEmployee> assignedEmployees
parcel.writeParcelable(checkin,i); //if custom class, eg. Checkin checkin;
}
At Constructor for reading it back
protected A(Parcel in) {
name = in.readString();
assignedEmployees = in.createTypedArrayList(AssignedEmployee.CREATOR);
checkin = in.readParcelable(Checkin.class.getClassLoader());
}
where AssignedEmployee, Checkin where custom classes and it should implement Parcelable.
If you have only one Parcelable
object inside your main Parcelable
object, not list like the accepted answer case. Then it will be like the following:
Class A
public class A implements Parcelable {
public String str;
public B objectB;
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
//The parcelable object has to be the first one
dest.writeParcelable(objectB, flags);
dest.writeString(str);
}
private A(Parcel in) {
this.objectB = in.readParcelable(B.class.getClassLoader());
str = in.readString();
}
public static final Parcelable.Creator<A> CREATOR
= new Parcelable.Creator<A>() {
public A createFromParcel(Parcel in) {
return new A(in);
}
public A[] newArray(int size) {
return new A[size];
}
};
}
Class B
public class B implements Parcelable {
public String str;
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(str);
}
private B(Parcel in) {
str = in.readString();
}
public static final Parcelable.Creator<B> CREATOR
= new Parcelable.Creator<B>() {
public B createFromParcel(Parcel in) {
return new B(in);
}
public B[] newArray(int size) {
return new B[size];
}
};
}
IMPORTANT:
Please note that the order that you write and read the Parcelable
object matters. Checkout this answer for more details
Just press ALT+ENTER and replace Parcelable it will implement all the necessary implementation
I finally figured out what to type into Google :), and found this Android, How to use readTypedList method correctly in a Parcelable class?
The solution was to use read-/writeTypedList
instead. I also initialize the arraylist to avoid any further NullPointerException.
Class A
public class A implements Parcelable {
public String str;
public ArrayList<B> list = new ArrayList<B>();
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(str);
dest.writeTypedList(list);
}
private A(Parcel in) {
str = in.readString();
in.readTypedList(list, B.CREATOR);
}
public static final Parcelable.Creator<A> CREATOR
= new Parcelable.Creator<A>() {
public A createFromParcel(Parcel in) {
return new A(in);
}
public A[] newArray(int size) {
return new A[size];
}
};
}
Class B
public class B implements Parcelable {
public String str;
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(str);
}
private B(Parcel in) {
str = in.readString();
}
public static final Parcelable.Creator<B> CREATOR
= new Parcelable.Creator<B>() {
public B createFromParcel(Parcel in) {
return new B(in);
}
public B[] newArray(int size) {
return new B[size];
}
};
}