如何向ViewHolder添加绑定，以获得回收器视图中项目的tvTodoTitle和cbDone变量

Question

我想知道如何将绑定添加到我的viewholder中，以便能够获得todoTitle和cbDone变量，或者找到获取这些变量的替代方法。我已经尝试过对此进行研究，但是，我无法将绑定放入viewholder的参数中，因为它只允许一个(itemview:View(，所以如果有任何其他方法可以使用绑定或获取这些参数，那么这将非常有帮助。

如有任何帮助，我们将不胜感激。

如果您需要更多的代码，请询问。

主要活动

package com.example.todoit
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.todoit.data.Todo
import com.example.todoit.data.TodoDataBase
import com.example.todoit.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
private lateinit var todoAdapter: TodoAdapter
private lateinit var todoDB: TodoDataBase
private lateinit var binding: ActivityMainBinding

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
todoAdapter = TodoAdapter(mutableListOf())
val rvTodoItems = binding.rvTodoItems
val btnAddTodo = binding.btnAddTodo
val etTodoTitle = binding.etTodoTitle
val btnDeleteTodo = binding.btnDeleteTodo
rvTodoItems.layoutManager = LinearLayoutManager(this)
rvTodoItems.adapter = todoAdapter
btnAddTodo.setOnClickListener {
val todoTitle = binding.etTodoTitle.toString()
if (todoTitle.isNotEmpty()) {
val todo = Todo(null, todoTitle, false)
todoAdapter.addTodo(todo)
etTodoTitle.text.clear()
Toast.makeText(this, "Successfully written data", Toast.LENGTH_LONG).show()
writeData()
} else {
Toast.makeText(this, "There was an error while writing data", Toast.LENGTH_LONG)
.show()
}
}

btnDeleteTodo.setOnClickListener {
todoAdapter.deleteDoneTodos()
Toast.makeText(this, "Selected Todo(s) Deleted", Toast.LENGTH_LONG).show()
}
}

private fun writeData() {
val todoTitle = binding.etTodoTitle.toString()
if (todoTitle.isNotEmpty()) {
val todo = Todo(null, todoTitle, false)
//Add data to database
todoDB.todoDao().insertAll(todo)
}
}
}

TodoAdapter

package com.example.todoit
import android.graphics.Paint.STRIKE_THRU_TEXT_FLAG
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.example.todoit.data.Todo

class TodoAdapter(
private val todos: MutableList<Todo>,
) : RecyclerView.Adapter<TodoAdapter.TodoViewHolder>() {
class TodoViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TodoViewHolder {
return TodoViewHolder(
LayoutInflater.from(parent.context).inflate(
R.layout.item_todo,
parent,
false
)
)
}
fun addTodo(todo: Todo) {
todos.add(todo)
notifyItemInserted(todos.size - 1)
}
fun deleteDoneTodos() {
todos.removeAll { todo ->
todo.isChecked
}
notifyDataSetChanged()
}
private fun toggleStrikeThrough(tvTodoTitle: TextView, isChecked: Boolean) {
if(isChecked) {
tvTodoTitle.paintFlags = tvTodoTitle.paintFlags or STRIKE_THRU_TEXT_FLAG
} else {
tvTodoTitle.paintFlags = tvTodoTitle.paintFlags and STRIKE_THRU_TEXT_FLAG.inv()
}
}
override fun onBindViewHolder(holder: TodoViewHolder, position: Int) {

val curTodo = todos[position]
holder.itemView.apply {
etTodoTitle = curTodo.title
cbDone.isChecked = curTodo.isChecked
toggleStrikeThrough(tvTodoTitle, curTodo.isChecked)
cbDone.setOnCheckedChangeListener { _, isChecked ->
toggleStrikeThrough(tvTodoTitle, isChecked)
curTodo.isChecked = !curTodo.isChecked
}
}
}
override fun getItemCount(): Int {
return todos.size
}
}

Answer 1

这是一个示例适配器，该适配器运行良好。你可以使用

public class SenListAdapter() :
RecyclerView.Adapter<SenListAdapter.MyViewHolder>() {
var data: MutableList<QuizResponse.Datum> = ArrayList()
var itemListener: EventListener? = null
var inflater: LayoutInflater? = null
private var onLoadMoreListener: OnLoadMoreListener? = null
var mData = ""
var context:Context?=null
constructor(context: Context, quizType: String) : this() {
this.quizType = quizType
this.context=context
}
override fun getItemViewType(position: Int): Int {
return position
}
fun addAll(mData: List<QuizResponse.Datum>?) {
data.clear();
data.addAll(mData!!)
notifyDataSetChanged()
}
fun clear() {
data.clear()
notifyDataSetChanged()
}
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): SenListAdapter.MyViewHolder {
inflater = LayoutInflater.from(parent.context)
val itemHomeSenBinding = DataBindingUtil.inflate<ItemHomeSenBinding>(
inflater!!,
R.layout.item_home_sen, parent, false
)
return MyViewHolder(itemHomeSenBinding)
}

override fun onBindViewHolder(holder: SenListAdapter.MyViewHolder, position: Int) {
populateItemRows(holder, position)
}
private fun populateItemRows(holder: SenListAdapter.MyViewHolder, position: Int) {
var item = data.get(position)
holder.itemHomeSenBinding.tvQuizName.text = item.name
holder.itemHomeSenBinding.tvCost.text = "₹ " + item.entryFee.toString()
holder.itemHomeSenBinding.tvEstimatedTime.text = item.time
holder.itemHomeSenBinding.tvWinningAmtText.text = "Win upto ₹ " + item.reward.toString()
}
override fun getItemCount(): Int {
return data.size
}
inner class MyViewHolder(var itemHomeSenBinding: ItemHomeSenBinding) :
RecyclerView.ViewHolder(
itemHomeSenBinding.root
) {
init {
setEventlistener(itemListener)
}
}
interface EventListener {
fun onBuyNow(position: Int, item: QuizResponse.Datum?)
fun onStartNow(position: Int, item: QuizResponse.Datum?)
}
fun setEventlistener(onItemClick: EventListener?) {
itemListener = onItemClick
}
}