drakeet/MultiType

dependencies {
  implementation 'com.drakeet.multitype:multitype:4.3.0'
}

data class Foo(
  val value: String
)

class FooViewDelegate: ItemViewDelegate<Foo, FooViewDelegate.ViewHolder>() {

  override fun onCreateViewHolder(context: Context, parent: ViewGroup): ViewHolder {
    // If you want a LayoutInflater parameter instead of a Context,
    // you can use ItemViewBinder as the parent of this class.
    return ViewHolder(FooView(context))
  }

  override fun onBindViewHolder(holder: ViewHolder, item: Foo) {
    holder.fooView.text = item.value

    Log.d("ItemViewDelegate API", "position: ${holder.bindingAdapterPosition}")
    Log.d("ItemViewDelegate API", "items: $adapterItems")
    Log.d("ItemViewDelegate API", "adapter: $adapter")
    Log.d("More", "Context: ${holder.itemView.context}")
  }

  class ViewHolder(itemView : View): RecyclerView.ViewHolder(itemView) {
    val fooView: TextView = itemView.findViewById(R.id.foo)
  }
}

class FooViewDelegate : ViewDelegate<Foo, FooView>() {

  override fun onCreateView(context: Context): FooView {
    return FooView(context).apply { layoutParams = LayoutParams(MATCH_PARENT, WRAP_CONTENT) }
  }

  override fun onBindView(view: FooView, item: Foo) {
    view.imageView.setImageResource(item.imageResId)
    view.textView.text = item.text

    view.textView.text = """
      |${item.text}
      |viewHolder: ${view.holder}
      |layoutPosition: ${view.layoutPosition}
      |absoluteAdapterPosition: ${view.absoluteAdapterPosition}
      |bindingAdapterPosition: ${view.bindingAdapterPosition}
    """.trimMargin()
  }
}

class SampleActivity : AppCompatActivity() {

  private val adapter = MultiTypeAdapter()
  private val items = ArrayList<Any>()

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_list)
    val recyclerView = findViewById<RecyclerView>(R.id.list)

    adapter.register(TextItemViewDelegate())
    adapter.register(ImageItemViewDelegate())
    adapter.register(RichItemViewDelegate())
    recyclerView.adapter = adapter

    val textItem = TextItem("world")
    val imageItem = ImageItem(R.mipmap.ic_launcher)
    val richItem = RichItem("小艾大人赛高", R.drawable.img_11)

    for (i in 0..19) {
      items.add(textItem)
      items.add(imageItem)
      items.add(richItem)
    }
    adapter.items = items
    adapter.notifyDataSetChanged()
  }
}

adapter.register(Data::class).to(
  DataType1ViewDelegate(),
  DataType2ViewDelegate()
).withKotlinClassLinker { _, data ->
  when (data.type) {
    Data.TYPE_2 -> DataType2ViewDelegate::class
    else -> DataType1ViewDelegate::class
  }
}

open fun onBindViewHolder(holder: VH, item: T, payloads: List<Any>)
open fun getItemId(item: T): Long
open fun onViewRecycled(holder: VH)
open fun onFailedToRecycleView(holder: VH): Boolean
open fun onViewAttachedToWindow(holder: VH)
open fun onViewDetachedFromWindow(holder: VH)

Copyright (c) 2016-present. Drakeet Xu

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.