CODEWITHSUNDEEP
javaandroidandroid-intent
chipbk10
chipbk10

Reputation: 5955

Passing a complex object to an activity

I have read almost topics here how to pass a complex object to an activity. There are two ways to do:

1) Serializable object

2) Parcelable object

All the examples I saw are still simple objects or objects that contains primitive fields, or these fields can be serializable or parcelable.Now, let suppose I have a really really complex object such as:

public class ComplexObject{

private Class1 object1;
private Class2 object2;
....
private ClassN objectN;

}

The ith object can contain non-primitive fields. Now if I want to pass the ComplexObject to an activity, I have to serialize or parcelize every fields Class1, Class2, ClassN. Is there anyway to still pass my ComplexObject without doing every serialize or parcelize?

Upvotes: 0

Views: 186

Answers (3)

MaciejGórski
MaciejGórski

Reputation: 22232

If your complexObject is an application model, I suggest putting it in Application subclass, where it can be accessed from any component (Activity, Service). If you have more objects, put them in a List or Map inside model and pass identifier between Activities.

No need to make everything Parcelable.

Upvotes: 2

andrew
andrew

Reputation: 6563

You can do it though Parcelable

 public class MyParcelable implements Parcelable {
     private Class1 object1;
     private Class2 object2;
     ....
     private ClassN objectN;

     public int describeContents() {
         return 0;
     }

     public void writeToParcel(Parcel out, int flags) {
         out.writeParcelable(object1, flags)
         out.writeParcelable(object2, flags)
         ...
         out.writeParcelable(objectN, flags)
     }

     public static final Parcelable.Creator<MyParcelable> CREATOR
             = new Parcelable.Creator<MyParcelable>() {
         public MyParcelable createFromParcel(Parcel in) {
             return new MyParcelable(in);
         }

         public MyParcelable[] newArray(int size) {
             return new MyParcelable[size];
         }
     };

     private MyParcelable(Parcel in) {
         object1 = in.readParcelable(Class1.class.getClassLoader());
         object2 = in.readParcelable(Class2.class.getClassLoader());
         ...
         objectN = in.readParcelable(ClassN.class.getClassLoader());
     }
 }

I assume that Class1, Class2, ..., ClassN are already implemented Parcelable.

Upvotes: 1

FoamyGuy
FoamyGuy

Reputation: 46846

no, your top level object must be either serializeable, or parecelable in order to pass it as an Extra, and for that to work any child objects must also be serializable or parcelable.

These interfaces are the only way that the system knows how to package your data. Without implementing them it would have no way to know how to "break down" an arbitrary object into primitives that can be passed along as an Extra.

Upvotes: 2

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