[android-developers] Re: Best method to save a array in Bundle?

This is one of the interesting tensions resulting from the Google
decision to implement the Java language on the phone, in such a
limited environment. For Serializable IS the "Java way" of approaching
the problem. But as Dianne says, it is inefficient, woefully so in a
mobile phone environment. So it really should not be used in Android.
Just as Dianne says, Parcelable should be used instead, despite the
extra effort.

But I am sure many will continue to act based on the instincts they
learned from Java SE or EE and try to use Serializable. So we have to
keep repeating it, ad nauseum if need be: use Parcelable instead,
despite the extra initial effort.

Then again, there is another interesting question here: why is the OP
doing his own custom (un)marshalling in the first place? Does he
really need it, or is he just unaware of how to use classes already in
Android for that task?

On Sep 18, 11:17 am, Dianne Hackborn <hack...@android.com> wrote:
> Please do *not* use Serializable.  It is really inefficient.
>
> If you want to implement custom marshalling/unmarshalling, implement
> Parcelable.  It requires that you do more work, but it is far more
> efficient.
>
> On Sat, Sep 18, 2010 at 3:57 AM, YuviDroid <yuvidr...@gmail.com> wrote:
> > I haven't played with this, but if you make your class (myArrayType) implement
> > the Serializable interface it should work fine. Of course, all the instance
> > variables of that class must also be Serializable, otherwise you would still
> > get an exception (probably a NotSerializableException).
>
> > Hope it helps,
> > Yuvi
>
> > On Sat, Sep 18, 2010 at 12:46 PM, jlopeznava...@gmail.com <
> > jlopeznava...@gmail.com> wrote:
>
> >> I have 2 dimensions array like this:
> >> public myArrayType[][] mObjArray;
>
> >> I want to save it in the onSaveInstanceState method, since my array
> >> contains lot of elements I dont want to save element by element but
> >> the whole array object, what is the best way?
>
> >> I tried this but exception is thrown:
>
> >> ---------------------------------------------------------
>
> >>  public Bundle saveState(Bundle map) {
>
> >>        if (map != null) {
> >>                map.putSerializable("objLevel", (Serializable)
> >> mCurrentLevelMatrix);
> >>        }
>
> >>        return map;
> >>    }
>
> >> -------------------------------------------------------
>
> >> I have seen a putParcelableArrayList method but dunno how it works
> >> exactly.
>
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> > to quickly access your favorite apps and contacts!)
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>
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> --
> 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, and so won't reply to such e-mails.  All such
> questions should be posted on public forums, where I and others can see and
> answer them.

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