I am getting an exception related to `SaveableStat...

# compose

[Noé Casas]

I am getting an exception related to SaveableStateProvider that says java.lang.IllegalArgumentException: Type of the key XXXX is not supported. On Android you can only use types which can be stored inside the Bundle. . What does it mean that a type can be stored inside the Bundle? Here, XXXX is a mere sealed class, nothing exotic.

[Ian Lake]

Bundle (and BaseBundle, the class it extends) has a bunch of specific types it supports - you'll note the putString, putParcelable, etc. methods on the class: https://developer.android.com/reference/android/os/Bundle

[Ian Lake]

One of the parameters rememberSaveable takes is a Saver that lets you translate your mere sealed class into something that can be persisted across process death/recreation in a Bundle: https://developer.android.com/reference/kotlin/androidx/compose/runtime/saveable/package-summary#remembersaveable

[zhuinden]

needs to be parcelable or serializable

[Ian Lake]

There's a nice list of every acceptable type in SavedStateHandle (which has the same limitations): https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:lifecycl[…]/src/main/java/androidx/lifecycle/SavedStateHandle.java;l=376

[Ian Lake]

private static final Class[] ACCEPTABLE_CLASSES = new Class[]{
            //baseBundle
            boolean.class,
            boolean[].class,
            double.class,
            double[].class,
            int.class,
            int[].class,
            long.class,
            long[].class,
            String.class,
            String[].class,
            //bundle
            Binder.class,
            Bundle.class,
            byte.class,
            byte[].class,
            char.class,
            char[].class,
            CharSequence.class,
            CharSequence[].class,
            // type erasure ¯\_(ツ)_/¯, we won't eagerly check elements contents
            ArrayList.class,
            float.class,
            float[].class,
            Parcelable.class,
            Parcelable[].class,
            Serializable.class,
            short.class,
            short[].class,
            SparseArray.class,
            (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? Size.class : int.class),
            (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? SizeF.class : int.class),

[Andrey Kulikov]

yes, maybe you want to use @Parselize annotation which auto generates parcelable for you

[Noé Casas]

I see, thank you very much!