Component used:

slices/view/src/main/java/androidx/slice/SliceViewManager.java
slices/core/src/main/java/androidx/slice/SliceProvider.java

Version used:

androidx.slice:slice-view:1.1.0-alpha01
androidx.slice:slice-core:1.1.0-alpha01

Devices/Android versions reproduced on:

Android 10 Emulators (API-29)

Bug

Using SliceViewManager.SliceCallback fails at runtime as the return type maybe null (Kotlin runtime null-check is failing!).

Reason

The callback interface SliceViewManager.SliceCallback is defined as SliceCallback.onSliceUpdated(@NonNull Slice s). That does not match as SliceProvider.onBindSlice is defined with @Nullable annotation[2]:

@Nullable
@RequiresApi(19)
public abstract Slice onBindSlice(@NonNull Uri sliceUri);

What is true? I think it should be nullable on both sides.

Regards

Benjamin E.