如何禁用更新项目时发生的 RecyclerView (ListAdapter) 自动滚动?

Ram*_*mli 11 android android-recyclerview android-paging android-diffutils android-listadapter

背景

我有一个用户界面,显示用户全名列表,每个项目都有一个喜欢/不喜欢按钮。我正在使用一个ListAdapter底层用途DiffUtilAsyncListDifferAPI。用户列表作为 LiveData 从 Room 数据库接收,并按"isLiked" 排序

问题

每当点击“like”按钮时,Room(因为我正在使用 LiveData)会将新数据重新提交到适配器。问题是,由于列表按“isLiked”排序,喜欢的用户将更改其位置,并且 RecyclerView 将始终滚动到新位置。

我不想看到更新项目的新位置。那么,如何禁用自动滚动行为?

我尝试过的

MainActivity.kt

    ..
    val userAdapter = UsersAdapter(this)
    val ll = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)
   
    recyclerView.apply {
        layoutManager = ll
        adapter = userAdapter
        itemAnimator = null
        setHasFixedSize(true)
    }
    
    viewModel.users.observe(this, {
        // This will force the recycler view to scroll back to the previous position
        // But it's more of a workaround than a clean solution.
        val pos = ll.findFirstVisibleItemPosition()
        userAdapter.submitList(it) {
            recyclerView.scrollToPosition(pos)
        }
    })
    ..
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用户适配器.kt

class UsersAdapter(
    private val clickListener: UserClickListener
) : ListAdapter<UserEntity, UsersAdapter.UserViewHolder>(DIFF_CALLBACK) {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): UserViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_user, parent, false)
        return UserViewHolder(view)
    }

    override fun onBindViewHolder(holder: UserViewHolder, position: Int) {
        val userEntity = getItem(position)
        holder.bind(userEntity, clickListener)
    }

    class UserViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        private val textView: TextView = view.findViewById(R.id.fullName)
        private val fav: ImageButton = view.findViewById(R.id.fav)

        fun bind(user: UserEntity, clickListener: UserClickListener) {
            textView.text = user.fullName

            val favResId = if (user.favorite) R.drawable.like else R.drawable.dislike
            fav.setImageResource(favResId)

            fav.setOnClickListener {
                val newFav = !user.favorite
                val newFavResId = if (newFav) R.drawable.like else R.drawable.dislike
                fav.setImageResource(newFavResId)
                clickListener.onUserClicked(user, newFav)
            }
        }
    }

    interface UserClickListener {
        fun onUserClicked(user: UserEntity, isFavorite: Boolean)
    }

    companion object {
        private val DIFF_CALLBACK = object : DiffUtil.ItemCallback<UserEntity>() {
            override fun areItemsTheSame(
                oldUser: UserEntity,
                newUser: UserEntity
            ) = oldUser.id == newUser.id

            override fun areContentsTheSame(
                oldUser: UserEntity,
                newUser: UserEntity
            ) = oldUser.fullName == newUser.fullName && oldUser.favorite == newUser.favorite
        }
    }
}
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我尝试使用常规 RecyclerView 适配器和 DiffUtil,并将检测移动设置为 false。
我还添加了 AsyncListDiffer。
我尝试了ListAdapter,甚至尝试了分页库并使用了PagedListAdapter。
DiffUtil 的回调更改了自动滚动,但我无法获得所需的行为。

任何帮助是极大的赞赏!