1.导入依赖包

在gradle(app)中：

dependencies {
  ......
implementation 'androidx.recyclerview:recyclerview:1.2.0-alpha06'
}

(版本地址:https://developer.android.com/jetpack/androidx/releases/recyclerview)

2.创建子部件视图

children_view.xml

2.写子视图布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:layout_marginTop="20dp">
    <TextView
        android:id="@+id/children_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/colorPrimary"
        android:textSize="24dp"/>
</LinearLayout>

children_view.png

3.创建RecyclerView的适配器

1.创建RecyclerViewAdapter类，继承自RecyclerView.Adapter

package com.ed.myapplication
import androidx.recyclerview.widget.RecyclerView
class RecyclerViewAdapter : RecyclerView.Adapter {}

image.png

报错：适配器需要类型参数<VH : RecyclerView.ViewHolder>.这里传的参数为【RecyclerView.ViewHolder】

2.创建一个类RecyclerViewHolder继承RecyclerView.ViewHolder。用于获取资源（也可创建在RecyclerViewAdapter内部）

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

目录

3.将RecyclerViewHolder类传入RecyclerViewAdapter缺少的参数中，重写方法

class RecyclerViewAdapter : RecyclerView.Adapter<RecyclerViewHolder>() {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerViewHolder {
        TODO("Not yet implemented")
    }

    override fun onBindViewHolder(holder: RecyclerViewHolder, position: Int) {
        TODO("Not yet implemented")
    }

    override fun getItemCount(): Int {
        TODO("Not yet implemented")
    }

}

4.在适配器中填写逻辑

package com.ed.myapplication

import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView

class RecyclerViewAdapter : RecyclerView.Adapter<RecyclerViewHolder>() {

    //1.模拟数据
    private val dataList = arrayListOf(
        "Tom Sachs SOLO",
        "Andy Sachs RTC",
        "Tony Sachs FDPE",)

    //3.将子布局与适配器连接起来
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.children_view, parent, false)
        //此处可以设置各种事件
        return RecyclerViewHolder(view)
    }

    //4.将数据赋值到视图里
    override fun onBindViewHolder(holder: RecyclerViewHolder, position: Int) {
        var dataCurrentView = dataList[position]
        holder.children_textView.text = dataCurrentView
    }

    //2.返回数据大小
    override fun getItemCount(): Int {
        return dataList!!.size
    }

}

4.更改主视图activity_mian.xml，添加RecyclerView

<?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">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/main_recycler_view"
            app:layout_constraintTop_toBottomOf="@id/title"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </androidx.recyclerview.widget.RecyclerView>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

5.写主类逻辑。将适配器与主视图连接

package com.ed.myapplication

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.recyclerview.widget.LinearLayoutManager
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val layoutManager = LinearLayoutManager(this) //设置布局方式
        main_recycler_view.layoutManager = layoutManager

        val mainAdapter = RecyclerViewAdapter() //传入适配器
        main_recycler_view.adapter = mainAdapter
    }
}

6.🙆🆗👌