下面是一个完整的示例，展示了一个具有两种类型的RecyclerView，视图类型由对象决定。
类模型
open class RecyclerViewItem
class SectionItem(val title: String) : RecyclerViewItem()
class ContentItem(val name: String, val number: Int) : RecyclerViewItem()
适配器代码
const val VIEW_TYPE_SECTION = 1
const val VIEW_TYPE_ITEM = 2
class UserAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
var data = listOf<RecyclerViewItem>()
override fun getItemViewType(position: Int): Int {
if (data[position] is SectionItem) {
return VIEW_TYPE_SECTION
}
return VIEW_TYPE_ITEM
}
override fun getItemCount(): Int {
return data.size
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
if (viewType == VIEW_TYPE_SECTION) {
return SectionViewHolder(
LayoutInflater.from(parent.context).inflate(R.layout.item_user_section, parent, false)
)
}
return ContentViewHolder(
LayoutInflater.from(parent.context).inflate(R.layout.item_user_content, parent, false)
)
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
val item = data[position]
if (holder is SectionViewHolder && item is SectionItem) {
holder.bind(item)
}
if (holder is ContentViewHolder && item is ContentItem) {
holder.bind(item)
}
}
internal inner class SectionViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(item: SectionItem) {
itemView.text_section.text = item.title
}
}
internal inner class ContentViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(item: ContentItem) {
itemView.text_name.text = item.name
itemView.text_number.text = item.number.toString()
}
}
}
item_user_section.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/text_section"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#eee"
android:padding="16dp" />
item_user_content.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="32dp">
<TextView
android:id="@+id/text_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="Name" />
<TextView
android:id="@+id/text_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
示例使用
val dataSet = arrayListOf<RecyclerViewItem>(
SectionItem("A1"),
ContentItem("11", 11),
ContentItem("12", 12),
ContentItem("13", 13),
SectionItem("A2"),
ContentItem("21", 21),
ContentItem("22", 22),
SectionItem("A3"),
ContentItem("31", 31),
ContentItem("32", 32),
ContentItem("33", 33),
ContentItem("33", 34),
)
recyclerAdapter.data = dataSet
recyclerAdapter.notifyDataSetChanged()
