Kotlin:单击RecycleView项时显示AlertDialog [英] Kotlin: Show AlertDialog when RecycleView item clicked
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问题描述
现在,我正在研究单击RecyclerView项时显示AlertDialog. 但是,我不知道如何为点击侦听器设置适配器. 你能给我个小费吗?
Now I'm studying to show AlertDialog when RecyclerView item clicked. However, I don't know how to set the adapter for click listener. Could you give me a tip?
首先,我尝试将AlertDialog放置在此Main Activity中. 这是正确的位置吗?
Firstly, I tried to put the AlertDialog in this Main Activity. Is this right position?
MainActivity
MainActivity
class MainActivity : AppCompatActivity() {
private val foodList = listOf(
FoodModel("Noodle", 2),
FoodModel("Cake", 3),
FoodModel("Pizza", 4),
FoodModel("Stake", 5),
FoodModel("Chicken", 4)
)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val adapter = FoodDataAdapter(foodList)
adapter.notifyDataSetChanged()
foodListView.adapter = adapter
foodListView.layoutManager = LinearLayoutManager(this)
fun onItemClick(item: FoodModel, position: Int) {
val dialog = AlertDialog.Builder(this)
dialog.setTitle("Item deletion")
dialog.setMessage("Do you want to delete this item?")
dialog.setPositiveButton("Yes", DialogInterface.OnClickListener { _, _ ->
})
dialog.setNegativeButton("No", DialogInterface.OnClickListener { _, _ ->
})
dialog.setNeutralButton("Cancel", DialogInterface.OnClickListener { _, _ ->
})
dialog.show()
}
}
}
这是适配器.
class FoodDataAdapter(val list: List<FoodModel>):RecyclerView.Adapter<FoodDataViewHolder>(){
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FoodDataViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_food,parent,false)
return FoodDataViewHolder(view)
}
override fun getItemCount(): Int {
return list.count()
}
override fun onBindViewHolder(holder: FoodDataViewHolder, position: Int) {
holder.containerView.nameText.text=list[position].name
holder.containerView.priceText.text="${list[position].price}dollar"
}
}
查看持有人
class FoodDataViewHolder(override val containerView: View) : RecyclerView.ViewHolder(containerView),LayoutContainer
推荐答案
我编辑了您的代码. MainActivity:
I edited your code. MainActivity:
class MainActivity : AppCompatActivity(), FoodDataAdapter.OnItemClickListener {
var foodList = ArrayList<FoodModel>()
lateinit var adapter : FoodDataAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
foodlist.add(FoodModel("Noodle", 2))
foodlist.add(FoodModel("Cake", 3))
foodlist.add(FoodModel("Pizza", 4))
foodlist.add(FoodModel("Stake", 5))
foodlist.add(FoodModel("Chicken", 4))
adapter = FoodDataAdapter(foodList, this)
foodListView.adapter = adapter
foodListView.layoutManager = LinearLayoutManager(this)
}
override fun alertDialog(position: Int) {
val dialog = AlertDialog.Builder(this)
dialog.setTitle("Item deletion")
dialog.setMessage("Do you want to delete this item?")
dialog.setPositiveButton("Yes", DialogInterface.OnClickListener { _, _ ->
adapter.removeItem(position)
})
dialog.setNegativeButton("No", DialogInterface.OnClickListener { _, _ ->
})
dialog.setNeutralButton("Cancel", DialogInterface.OnClickListener { _, _ ->
})
dialog.show()
}
}
FoodDataAdapter:
FoodDataAdapter:
class FoodDataAdapter(var list: ArrayList<FoodModel>, var listener : FoodDataAdapter.OnItemClickListener):RecyclerView.Adapter<FoodDataAdapter.FoodDataViewHolder>(){
interface OnItemClickListener {
fun alertDialog(position : Int)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FoodDataViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_food,parent,false)
return FoodDataViewHolder(view)
}
override fun getItemCount(): Int {
return list.count()
}
fun removeItem(position: Int) {
list.removeAt(position)
notifyItemRemoved(position)
}
override fun onBindViewHolder(holder: FoodDataViewHolder, position: Int) {
holder.nameText.text=list[position].name
holder.priceText.text="${list[position].price}dollar"
}
inner class FoodDataViewHolder(containerView: View) : RecyclerView.ViewHolder(containerView),
View.OnClickListener {
var nameText: TextView = containerView.findViewById(R.id.nameText)
var priceText: TextView = containerView.findViewById(R.id.priceText)
init {
containerView.setOnClickListener(this)
}
override fun onClick(v: View?) {
listener.alertDialog(adapterPosition)
}
}
}
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