SliceApp.kt

class MyApplication : Application() {

    override fun onCreate() {
        super.onCreate()
        grantAssistantPermissions()
    }
    
    private fun grantAssistantPermissions() {
        getAssistantPackage()?.let { assistantPackage ->
            val sliceProviderUri = Uri.Builder()
                .scheme(ContentResolver.SCHEME_CONTENT)
                .authority("test.aircall.todo.slices")
                .build()
            SliceManager.getInstance(this).grantSlicePermission(assistantPackage, sliceProviderUri)
        }
    }

    private fun getAssistantPackage(): String? {
        val resolveInfoList = packageManager?.queryIntentServices(
            Intent(VoiceInteractionService.SERVICE_INTERFACE), 0
        )
        return resolveInfoList?.firstOrNull()?.serviceInfo?.packageName
    }
}