ListAdapter with DiffUtil.ItemCallback always considers objects the same

LiveData returns the same instances in the List.

Solution I found - create new List with copy of Items:

    val nameObserver = Observer<List<Item>> {
        val newList = mutableListOf<Item>()
        it.forEach { item -> newList.add(item.copy()) }
        adapter.submitList(newList)
    }

Since LiveData returns the same List you have to create a new one.

Here is a shorter answer to the original answer by using toList().

recycler.observe(this, Observer{
    adapter.submitList(it.toList()) 
})

If you rather use a kotlin extension you can do something like this:

fun <T> MutableLiveData<List<T>>.add(item: T) {
    val updatedItems = this.value?.toMutableList()
    updatedItems?.add(item)
    this.value = updatedItems
}

That way you don't have to add the toList() and just use the extension.

Kotlin with Data Classes

adapter.submutList(list.map { it.copy() })