RealmObject AND Parcelable

问题:

I'm new to Realm for Android so I'm not sure I'm approaching this the right way. I have a class which looks like this:

public class Entry extends RealmObject implements Parcelable {
    ...
}

The problem is the Parcelable interface contains methods like describeContents() writeToParcel() and RealmObjects aren't supposed to have methods other than getters and setters:

Error:(81, 17) error: Only getters and setters should be defined in model classes

So my question is: How can I make these two work together? Is there a better way than creating an separate class (maybe something like RealmEntry)? Doing so would result in a lot of duplicated code...

回答1:

Now there's a different workaround for that: just implement the RealmModel interface instead of extending from RealmObject:

@RealmClass
public class User implements RealmModel {

}

You can find more information in the Realm Documentation.

回答2:

UPDATE May 2016: This is answer is now out-dated unless you already use Parceler. @Henrique de Sousa's solution is much better.

---

Actually, there is a workaround. You can get the result you want if you're willing to use a third-party library (Parceler) for Parcelable generation. See my answer to this other question, quoted below for convenience.

With Parceler v0.2.16, you can do this:

@RealmClass      // required if using JDK 1.6 (unrelated to Parceler issue)
@Parcel(value = Parcel.Serialization.BEAN, analyze = { Feed.class })
public class Feed extends RealmObject {
    // ...
}

Then, use Parcels.wrap(Feed.class, feed) instead of Parcels.wrap(feed) everywhere, otherwise your app will crash with org.parceler.ParcelerRuntimeException: Unable to create ParcelableFactory for io.realm.FeedRealmProxy.

回答3:

It's not possible at the moment to implement Parcelable on RealmObjects. One solution is to Use two realm files: the default one as your object store and a specialized one for temporary saves for rotations etc.