RecyclerView显示多种类型

对于这个问题我也好无语呀，这个很简单呀。

纯体力活。

RecyclerView课程地址

Android控件之RecyclerView

相关提问：

Recycleview 多种条目类型 如何绑定数据

案例源码地址：

https://github.com/TrillGates/RecyclerViewMultiTypeDemo

效果：

图片描述

解析

网络权限

    <uses-permission android:name="android.permission.INTERNET" />

主布局activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/contentListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#dfdfdf"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

主Activity:MainActivity.kt

class MainActivity : AppCompatActivity() {


    private val contentAdapter by lazy {
        ContentListAdapter()
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        //初始化数据
        initData()
        //初始化控件
        initView()
    }

    private fun initView() {
        contentListView.apply {
            layoutManager = LinearLayoutManager(this@MainActivity)
            this.adapter = contentAdapter
            addItemDecoration(object : RecyclerView.ItemDecoration() {
                override fun getItemOffsets(
                    outRect: Rect,
                    view: View,
                    parent: RecyclerView,
                    state: RecyclerView.State
                ) {
                    outRect.bottom = 2
                }
            })
        }

    }

    private fun initData() {
        val dataJson = requestData.resultJson
        val gson = Gson()
        val response = gson.fromJson<Response>(dataJson, Response::class.java)
        contentAdapter.addData(response.data)
        println(response.code)
        println(response.message)
        println(response.data.size)
    }
}

适配器ContentListAdapter.kt

class ContentListAdapter : RecyclerView.Adapter<ContentListAdapter.InnerHolder>() {

    private val data = ArrayList<ListItem>()

    companion object {
        const val NONE_IMG: Int = 0
        const val ONE_IMG: Int = 1
        const val TWO_IMG: Int = 2
        const val THREE_IMG: Int = 3
    }

    fun addData(contents: List<ListItem>) {
        data.clear()
        data.addAll(contents)
        notifyDataSetChanged()
    }

    class InnerHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

    }

    override fun getItemViewType(position: Int): Int {
        return when (data[position].covers.size) {
            0 -> NONE_IMG
            1 -> ONE_IMG
            2 -> TWO_IMG
            else -> THREE_IMG
        }
    }

    override fun onCreateViewHolder(
        parent: ViewGroup,
        viewType: Int
    ): InnerHolder {
        val itemView: View
        when (viewType) {
            NONE_IMG -> {
                val itemBind = DataBindingUtil.inflate<ItemNoImageBinding>(
                    LayoutInflater.from(parent.context),
                    R.layout.item_no_image,
                    parent,
                    false
                )
                itemView = itemBind.root
                itemView.tag = itemBind
            }
            ONE_IMG -> {
                val itemBind = DataBindingUtil.inflate<ItemOneImageBinding>(
                    LayoutInflater.from(parent.context),
                    R.layout.item_one_image,
                    parent,
                    false
                )
                itemView = itemBind.root
                itemView.tag = itemBind
            }
            TWO_IMG -> {
                val itemBind = DataBindingUtil.inflate<ItemTwoImageBinding>(
                    LayoutInflater.from(parent.context),
                    R.layout.item_two_image,
                    parent,
                    false
                )
                itemView = itemBind.root
                itemView.tag = itemBind
            }
            else -> {
                val itemBind = DataBindingUtil.inflate<ItemThreeImageBinding>(
                    LayoutInflater.from(parent.context),
                    R.layout.item_three_image,
                    parent,
                    false
                )
                itemView = itemBind.root
                itemView.tag = itemBind
            }
        }


        return InnerHolder(itemView)
    }

    override fun getItemCount(): Int {
        return data.size
    }

    override fun onBindViewHolder(holder: InnerHolder, position: Int) {
        val dataBinding = holder.itemView.tag
        val data = data[position]
        when (dataBinding) {
            is ItemNoImageBinding -> {
                dataBinding.item = data
            }
            is ItemOneImageBinding -> {
                dataBinding.item = data
            }
            is ItemTwoImageBinding -> {
                dataBinding.item = data
            }
            is ItemThreeImageBinding -> {
                dataBinding.item = data
            }
        }
    }
}

数据bean类

data class ListItem(
    val title: String,
    val covers: ArrayList<String>,
    val viewCount: Int,
    val commentCount: Int
);

图片加载工具类

class ImageLoadUtils {
    companion object {
        @BindingAdapter("imagePath")
        @JvmStatic
        fun loadImage(image: ImageView, imageUrl: String?) {
            if (!TextUtils.isEmpty(imageUrl)) {
                Glide.with(image.context).load(imageUrl).into(image)
            }
        }
    }
}

布局之类的代码请下载吧。

就是这么简单，全部代码请到github上载。

RecyclerViewMultiTypeDemo