android nested object parceling

Question

how can we parcel nested object in an intent?.
For example lets say there is an object A which contain one string variable and one another object B. now B contain object C . C contain a list of string. so how i can parcel object A in an intent.
any help on this will be appreciated.
thanks in advance.

Implementation:

public static class A 
{
    private B  ObjectB;
}

public static class B 
{
    private String type;
    private List<C> C;
}

public static class C 
{
    private List<D> D;
}

public static class D 
{
    private String id;
    private String name;
    private String address;
    private String email;
}

how to write parcelable for class C. i am using

dest.writeParceable(ObjectC,flag)

For reading:

in.readParcelable(C.getClass().getClassLoader());

but its not working

score 1 · Accepted Answer · edited Apr 21 '15 at 07:59

1

You would have to implement parcelable for object B and then implement parcelable for object A. I have never done this but the above should work.

Edit

See the code snippets below which illustrates how to implement parcelable for Class C.

First implement parcelable for Class D like so:

dest.writeString(id); 
dest.writeString(name);  
dest.writeString(address);  
dest.writeString(email);

id = in.readString();  
name = in.readString();  
address = in.readString();  
email = in.readString();

Then implement parcelable for Class C as follows:

dest.writeList(D);

in.readList(D,this.getClass().getClassLoader());

This is untested code as I have never implemented nested parceling but worth a try. Hope that helps.

edited Apr 21 '15 at 07:59

Sami Eltamawy

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answered Jul 10 '11 at 18:08

Mandel

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thanks mandel.it should work . but i dont know how to implement parcelable for object B. what should we write in writeToParcel(Parcel dest, int flags) and readFromParcel method when we implement parcelable for Object B. – Jul 10 '11 at 18:14
You will need to add code like so: `dest.writeString(.);` in writeToParce(.) and like so: `testString = in.readString();` in readFromParcel(.). Specifics will depend on the classes involved. – Mandel Jul 10 '11 at 18:23
No Mandel, it will not work for object. B is a collection of custom objects. writeString will work for string only. – Jul 10 '11 at 18:35
I just gave an example. Show me the three classes and I will be more specific. – Mandel Jul 10 '11 at 18:40
public static class DiagnosticHelp { private List categories; – Jul 11 '11 at 06:46
and if class A would be like this:
public static class A { private B <B> objectB;
}
then how will we implement parcel for b. – Jul 12 '11 at 08:08
how to write parcelable for class A? – Jul 12 '11 at 08:14

score 0 · Answer 2 · edited Feb 01 '19 at 08:18

One way I have seen this done is using serializeable

eg.

if you have a variable:

Date createdAt;

Then in writeToParcel(Parcel out, int flags) you can write:

out.writeSerializable(createdAt);

To read the value back yoy would use:

createdAt = (Date) in.readSerializable();

That being said though Parcelable was specifically created because Java serialization was considered too slow. So while this works it is not a good idea to use for larger pieces of data.

android nested object parceling

2 Answers2

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