When you put a serializable into a bundle, the bundle holds on to the object
reference UNTIL it needs to be marshalled across processes. At that point
it will get serialized into a byte stream, the bundle will be written into a
parcel, and the other side will receive a new bundle object with a different
serializable object.
Pretty much everywhere Bundle is used in the system, it will go through an
IPC at some point, so you need to assume the objects in it will get
serialized. About the only exception to that is the Bundle in Message,
since Message normally doesn't go across processes unless sent through a
Messenger. But if you are using the normal local Message sending facility,
there is really no reason to use the Bundle there, since you can just stick
whatever you want (including a HashMap of multiple items or your own custom
cloass) in the 'obj' field.
Also I strongly recommend staying away from serialization. It is super
super slow compared to Parcelable.
On Tue, Mar 24, 2009 at 3:20 AM, Matthias m.kaepp...@googlemail.com wrote:
Hi,
I was wondering about the behavior of Bundles and serializable
objects. If I put a serializable object into a bundle, what is
serialized then, the reference to the object or the object itself?
I always assumed that the object itself would be serialized to a byte
stream when calling putExtra() and re-created from that representation
when calling getSerializableExtra(), but I recently stumbled upon a
piece of code that put an entire view into a Bundle in thread A,
retrieved it from that bundle in thread B, performed a modification on
it and this modification actually became visible. This can only happen
if the reference to that view was stored, not the view itself, right?
Otherwise, the modification had been applied to a copy of that view
and would be meaningless.
--
Dianne Hackborn
Android framework engineer
hack...@android.com
Note: please don't send private questions to me, as I don't have time to
provide private support. All such questions should be posted on public
forums, where I and others can see and answer them.
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