自定义弹窗view

app/src/main/java/com/example/defenseapplication/adapter/MessageListAdapter.kt

@@ -0,0 +1,84 @@
+package com.example.defenseapplication.adapter
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import com.example.defenseapplication.databinding.ItemMessageGroupTitleBinding
+import com.example.defenseapplication.databinding.ItemMessageNoticeBinding
+
+sealed class MessageListItem {
+    data class Header(val title: String) : MessageListItem()
+    data class Message(
+        val time: String,
+        val title: String,
+        val dateTime: String,
+        val unread: Boolean
+    ) : MessageListItem()
+}
+
+class MessageListAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+    private val items = mutableListOf<MessageListItem>()
+
+    fun submitList(list: List<MessageListItem>) {
+        items.clear()
+        items.addAll(list)
+        notifyDataSetChanged()
+    }
+
+    override fun getItemViewType(position: Int): Int {
+        return when (items[position]) {
+            is MessageListItem.Header -> TYPE_HEADER
+            is MessageListItem.Message -> TYPE_MESSAGE
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
+        return if (viewType == TYPE_HEADER) {
+            val binding = ItemMessageGroupTitleBinding.inflate(
+                LayoutInflater.from(parent.context),
+                parent,
+                false
+            )
+            HeaderViewHolder(binding)
+        } else {
+            val binding = ItemMessageNoticeBinding.inflate(
+                LayoutInflater.from(parent.context),
+                parent,
+                false
+            )
+            MessageViewHolder(binding)
+        }
+    }
+
+    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
+        when (holder) {
+            is HeaderViewHolder -> holder.bind(items[position] as MessageListItem.Header)
+            is MessageViewHolder -> holder.bind(items[position] as MessageListItem.Message)
+        }
+    }
+
+    override fun getItemCount(): Int = items.size
+
+    private class HeaderViewHolder(private val binding: ItemMessageGroupTitleBinding) :
+        RecyclerView.ViewHolder(binding.root) {
+        fun bind(item: MessageListItem.Header) {
+            binding.tvGroupTitle.text = item.title
+        }
+    }
+
+    private class MessageViewHolder(private val binding: ItemMessageNoticeBinding) :
+        RecyclerView.ViewHolder(binding.root) {
+        fun bind(item: MessageListItem.Message) {
+            binding.tvTime.text = item.time
+            binding.tvTitle.text = item.title
+            binding.tvDateTime.text = item.dateTime
+            binding.unreadDot.visibility = if (item.unread) View.VISIBLE else View.INVISIBLE
+        }
+    }
+
+    companion object {
+        private const val TYPE_HEADER = 0
+        private const val TYPE_MESSAGE = 1
+    }
+}