Question

我看到这个问题问了几次，但也许是因为我使用的是骨肉皮库将项目添加到我的适配器，当其中一人被选中（类似于收音机，我不能够取消选择其他项目按钮功能）。我正在尝试将更改通知给适配器，并在某种程度上获得了所选项目的位置，但是我认为如果有人可以为我指出这一点，我可能仍然会缺少一些东西。

btn1.addEventListener('click', function(cls, event) {
       btn1.className = cls;
}.bind(null, one_class));

这里是我的适配器，这样的想法是，当一个项目处于选定状态时，与之关联的imageView将是可见的，而其他所有项目都将变为不可见。

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)


    rvOptions.layoutManager = LinearLayoutManager(activity)
    adapter = GroupAdapter()
    rvOptions.adapter = adapter


    viewModel = ViewModelProviders.of(activity as MainActivity).get(TestViewModel::class.java)
    val myViewModel = ViewModelProvider(
        this, MyViewModelFactoryForHashMap(arguments?.getString("headerText"))
    ).get(TestViewModel::class.java)

    myViewModel.userMutableLiveData.observe(this, userListUpdateObserver)

}


private val userListUpdateObserver: Observer<Array<ModelTest>?> =
    Observer { userArrayList ->
        for (s in userArrayList!!) {
            adapter.add(
                RecyclerDialogOptionsItem(
                    activity as MainActivity,
                    s.title,
                    s.selected!!,
                    this@MyDialogFragment
                )
            )
        }
    }

override fun onClickItem( position: Int) {

    adapter.notifyDataSetChanged()
}

}

非常感谢。

Answer 1

第一个选项：创建适配器，并在适配器中创建局部变量，并检查所选位置为变量。

第二个选项：在活动中创建名为selected_position的变量。当函数onClickItem调用时，将更新此变量并通知适配器更改。在您的项目中，检查活动中的变量，例如：

// Activity
selected_position = -1

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)


    rvOptions.layoutManager = LinearLayoutManager(activity)
    adapter = GroupAdapter()
    rvOptions.adapter = adapter


    viewModel = ViewModelProviders.of(activity as MainActivity).get(TestViewModel::class.java)
    val myViewModel = ViewModelProvider(
        this, MyViewModelFactoryForHashMap(arguments?.getString("headerText"))
    ).get(TestViewModel::class.java)

    myViewModel.userMutableLiveData.observe(this, userListUpdateObserver)

}


private val userListUpdateObserver: Observer<Array<ModelTest>?> =
    Observer { userArrayList ->
        for (s in userArrayList!!) {
            adapter.add(
                RecyclerDialogOptionsItem(
                    activity as MainActivity,
                    s.title,
                    s.selected!!,
                    this@MyDialogFragment
                )
            )
        }
    }

override fun onClickItem( position: Int) {
    selected_position = position
    adapter.notifyDataSetChanged()
}

}
// Item

class RecyclerDialogOptionsItem(
private val activity: MainActivity,
private val title: String?,
private var selected: Boolean,
private val adapterListener: AdapterListener
) : Item<GroupieViewHolder>() {

companion object {
    var clickListener: AdapterListener? = null
}


override fun bind(viewHolder: GroupieViewHolder, position: Int) {


    viewHolder.apply {

        with(viewHolder.itemView) {

            tvTitle.text = title

            clickListener = adapterListener
            if (activity.selected_position == position) {
                    ivChecked.visible()

                } else {
                    ivChecked.invisible()
                }

            itemView.setOnClickListener {
                clickListener?.onClickItem(adapterPosition)

            }


        }

        
    }

}


override fun getLayout() = R.layout.rv_options_item_row


interface AdapterListener {
    fun onClickItem(position: Int)
}

}

选择项目后，取消为Groupie RecyclerView选择所有其他项目

1 个答案: