IssueTracker

Open built-in serializers for Interface types 
 
Make `CharSequenceSerializer`, `JavaSerializableSerializer`, and `ParcelableSerializer` open generic classes instead of singleton objects so that users can inherit and define serializers for their own subtypes. This can be used to prevent `SERIALIZER_TYPE_INCOMPATIBLE` lint warning. For example, instead of suppressing the warning like this: 
 
``` 
@Serializable 
data class CharSequenceContainer( 
    @Suppress("SERIALIZER_TYPE_INCOMPATIBLE") 
    @Serializable(with = CharSequenceSerializer::class) 
    val value: String 
) 
``` 
 
Users can do: 
 
``` 
class StringAsCharSequenceSerializer : CharSequenceSerializer<String>() 
 
@Serializable 
data class CharSequenceContainer( 
    @Serializable(with = StringAsCharSequenceSerializer::class) 
    val value: String 
) 
``` 
 
The serializers can also be used directly with subclasses. For example, users can now write: 
 
``` 
encodeToSavedState(serializer = CharSequenceSerializer(), value = "foo") 
``` 
 
Since CharSequenceSerializer is now generic, it works with value `foo` even though it has a static type of String. 
 
We also made some changes to all the built-in serializers: 
 
- Changeed all built-in serializers from singleton objects to classes so that they're consistent with `CharSequenceSerializer`, `JavaSerializableSerializer`, and `ParcelableSerializer`. 
 
- Moved the actual `getXXX()`/`putXXX()` from `platformSpecificEncodeSerializableValue`/`platformSpecificDecodeSerializableValue` to `serialize()`/`deserialize()` functions of these serializers. This way we don't require special logic in `SavedStateEncoder.encodeSerializableValue()`/`SavedStateDecoder.decodeSerializableValue()`. 
 
Relnote: Open built-in serializers for Interface types 
Bug: 376026712 
Test: SavedStateCodecAndroidTest 
Change-Id: I28caf279b53cb69311c861e415390da7efd90c40

Files:

• M savedstate/savedstate-samples/src/main/java/androidx/savedstate/SavedStateCodecSamples.kt
• M savedstate/savedstate/api/current.txt
• M savedstate/savedstate/api/restricted_current.txt
• M savedstate/savedstate/bcv/native/current.txt
• D savedstate/savedstate/src/androidMain/kotlin/androidx/savedstate/serialization/SavedStateDecoder.android.kt
• D savedstate/savedstate/src/androidMain/kotlin/androidx/savedstate/serialization/SavedStateEncoder.android.kt
• M savedstate/savedstate/src/androidMain/kotlin/androidx/savedstate/serialization/serializers/BuiltInSerializer.android.kt
• M savedstate/savedstate/src/androidUnitTest/kotlin/androidx/savedstate/SavedStateCodecAndroidTest.android.kt
• M savedstate/savedstate/src/commonMain/kotlin/androidx/savedstate/serialization/SavedStateDecoder.kt
• M savedstate/savedstate/src/commonMain/kotlin/androidx/savedstate/serialization/SavedStateEncoder.kt
• M savedstate/savedstate/src/commonMain/kotlin/androidx/savedstate/serialization/serializers/BuiltInSerializer.kt
• M savedstate/savedstate/src/commonTest/kotlin/androidx/savedstate/SavedStateCodecTest.kt
• D savedstate/savedstate/src/nonAndroidMain/kotlin/androidx/savedstate/serialization/SavedStateDecoder.nonAndroid.kt
• D savedstate/savedstate/src/nonAndroidMain/kotlin/androidx/savedstate/serialization/SavedStateEncoder.nonAndroid.kt

Hash: dc358bcbe19b08a8358916297a549f0583ccd790
Date:  Tue Nov 26 13:09:44 2024