我知道有类似的问题,但我只是找不到类似的东西,我一直在学习新的东西来学习,同时将 kotlin 合成转换为 viewvbinding
模式,我遇到了这个错误
kotlin.UninitializedPropertyAccessException: lateinit property binding has not been initialized at com.codepalace.chatbot.ui.MessagingAdapter.onBindViewHolder(MessagingAdapter.kt:60) at com.codepalace.chatbot.ui.MessagingAdapter.onBindViewHolder(MessagingAdapter.kt:17)
它说我必须初始化绑定(bind),但我不知道把它放在哪里。
这是代码。
class MessagingAdapter: RecyclerView.Adapter<MessagingAdapter.MessageViewHolder>() {
var messagesList = mutableListOf<Message>()
private lateinit var binding: MessageItemBinding
inner class MessageViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
init {
itemView.setOnClickListener {
//Remove message on the item clicked
messagesList.removeAt(adapterPosition)
notifyItemRemoved(adapterPosition)
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MessageViewHolder {
return MessageViewHolder(
LayoutInflater.from(parent.context).inflate(R.layout.message_item, parent, false)
)
}
override fun getItemCount(): Int {
return messagesList.size
}
@SuppressLint("SetTextI18n")
override fun onBindViewHolder(holder: MessageViewHolder, position: Int) {
val currentMessage = messagesList[position]
when (currentMessage.id) {
SEND_ID -> {
holder.itemView.findViewById<View>(R.id.tv_message).apply {
binding.tvMessage.text = currentMessage.message
visibility = View.VISIBLE
}
holder.itemView.findViewById<View>(R.id.tv_bot_message).visibility = View.GONE
}
RECEIVE_ID -> {
holder.itemView.findViewById<View>(R.id.tv_bot_message).apply {
binding.tvBotMessage.text = currentMessage.message
visibility = View.VISIBLE
}
holder.itemView.findViewById<View>(R.id.tv_message).visibility = View.GONE
}
}
}
fun insertMessage(message: Message) {
this.messagesList.add(message)
notifyItemInserted(messagesList.size)
}
最佳答案
private lateinit var binding: MessageItemBinding
你没有初始化
binding
对象,因为您将其定义为lateinit,那么您应该定义它。这通常在
onCreateViewHolder
中override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TrackedActivityHolder {
val inflater = LayoutInflater.from(parent.context)
binding = DataBindingUtil.inflate<MessageItemBinding>(inflater, R.layout.message_item, parent, false)
return MessageViewHolder(
binding
)
}
更新 您需要接受
MessageItemBinding
键入而不是 View
在 MessageViewHolder
构造函数,并使用 itemView.root
获取列表项的 Root View 。inner class MessageViewHolder(itemView: MessageItemBinding) : RecyclerView.ViewHolder(itemView.root) {
init {
itemView.root.setOnClickListener {
//Remove message on the item clicked
messagesList.removeAt(adapterPosition)
notifyItemRemoved(adapterPosition)
}
}
}
关于android - lateinit 属性绑定(bind)尚未初始化,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/67796722/