[Android & Kotlin] RecyclerViewとItemTouchHelperでドラッグ&ドロップとSwipe操作

リスト要素順の移動をドラッグ&ドロップとスワイプで削除を行いたいというのがRecyclerViewの目的の一つですが、これにはItemTouchHelperを実装すると可能です。
簡単な設定として ItemTouchHelper.SimpleCallback を試してみます。

Android Studio
2021.2.1

RecycleView & ItemTouchHelper

　
ItemTouchHelperでは色々できるのですが、簡単にできるGoogle DeveloppersのItemTouchHelper.SimpleCallbackがお勧めです。
　

目次
1. 基本のコード
2. 画像・テキストリストでのItemTouchHelper

基本のItemTouchHelper

　
前に設定した基本のコードを元にして作成してきましょう
データセットは要素を削除したり可変長となるのでArrayListで作ります。

getAdapterPosition()
は非推奨になり代わりに
getBindingAdapterPosition()
getAbsoluteAdapterPosition()
などを使います

val mIth = ItemTouchHelper(object : ItemTouchHelper.SimpleCallback(
        // 上下のdragではonMove(), 左右のswipeではonSwiped()
        ItemTouchHelper.UP or ItemTouchHelper.DOWN,
        ItemTouchHelper.LEFT or  or ItemTouchHelper.RIGHT
    ) {
        override fun onMove(
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder,
            target: RecyclerView.ViewHolder
        ): Boolean {
            // 開始位置と移動先の位置
            val fromPos = viewHolder.bindingAdapterPosition
            val toPos = target.bindingAdapterPosition
            // adapterに移動したことを通知する
            adapter.notifyItemMoved(fromPos, toPos)
            return true // true if moved, false otherwise
        }

        override fun onSwiped(viewHolder: RecyclerView.ViewHolder, 
                direction: Int) {
            dataSet.removeAt(viewHolder.bindingAdapterPosition)
            // adapterに削除されたことを通知する
            adapter.notifyItemRemoved(viewHolder.bindingAdapterPosition)
        }
    })

val mIth = ItemTouchHelper(object : ItemTouchHelper.SimpleCallback(

// 上下のdragではonMove(), 左右のswipeではonSwiped()

ItemTouchHelper.UP or ItemTouchHelper.DOWN,

ItemTouchHelper.LEFT or or ItemTouchHelper.RIGHT

) {

override fun onMove(

recyclerView: RecyclerView,

viewHolder: RecyclerView.ViewHolder,

target: RecyclerView.ViewHolder

): Boolean {

// 開始位置と移動先の位置

val fromPos = viewHolder.bindingAdapterPosition

val toPos = target.bindingAdapterPosition

// adapterに移動したことを通知する

adapter.notifyItemMoved(fromPos, toPos)

return true // true if moved, false otherwise

}

override fun onSwiped(viewHolder: RecyclerView.ViewHolder,

direction: Int) {

dataSet.removeAt(viewHolder.bindingAdapterPosition)

// adapterに削除されたことを通知する

adapter.notifyItemRemoved(viewHolder.bindingAdapterPosition)

}

})

　
これをRcyclerViewに組み合わせてまとめていきます

MainActivity.kt

//package your.package.name

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.ItemDecoration
import java.util.*
import kotlin.collections.ArrayList

class MainActivity : AppCompatActivity() {

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

        val recyclerView = findViewById<RecyclerView>(R.id.my_recycler_view)

        recyclerView.setHasFixedSize(true)
        val layoutManager: RecyclerView.LayoutManager 
            = LinearLayoutManager(this)

        recyclerView.layoutManager = layoutManager

        val dataSet: ArrayList<String> = arrayListOf()
        var i = 0
        while (i < 20) {
            val str: String = java.lang.String.format(Locale.US, "Data_0%d", i)
            dataSet.add(str)
            i++
        }

        recyclerView.adapter = MyAdapter(dataSet)

        val itemDecoration: ItemDecoration =
            DividerItemDecoration(this, DividerItemDecoration.VERTICAL)
        recyclerView.addItemDecoration(itemDecoration)

        val adapter = recyclerView.adapter as MyAdapter

        val mIth = ItemTouchHelper(
            object : ItemTouchHelper.SimpleCallback(
                ItemTouchHelper.UP or ItemTouchHelper.DOWN,
                ItemTouchHelper.LEFT
            ) {
                override fun onMove(
                    recyclerView: RecyclerView,
                    viewHolder: RecyclerView.ViewHolder,
                    target: RecyclerView.ViewHolder
                ): Boolean {
                    val fromPos = viewHolder.bindingAdapterPosition
                    val toPos = target.bindingAdapterPosition
                    adapter.notifyItemMoved(fromPos, toPos)
                    return true // true if moved, false otherwise
                }

                override fun onSwiped(viewHolder: RecyclerView.ViewHolder, 
                        direction: Int) {
                    dataSet.removeAt(viewHolder.bindingAdapterPosition)
                    adapter.notifyItemRemoved(viewHolder.bindingAdapterPosition)
                }
            })

        mIth.attachToRecyclerView(recyclerView)
    }
}

//package your.package.name

import android.os.Bundle

import androidx.appcompat.app.AppCompatActivity

import androidx.recyclerview.widget.DividerItemDecoration

import androidx.recyclerview.widget.ItemTouchHelper

import androidx.recyclerview.widget.LinearLayoutManager

import androidx.recyclerview.widget.RecyclerView

import androidx.recyclerview.widget.RecyclerView.ItemDecoration

import java.util.*

import kotlin.collections.ArrayList

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

val recyclerView = findViewById<RecyclerView>(R.id.my_recycler_view)

recyclerView.setHasFixedSize(true)

val layoutManager: RecyclerView.LayoutManager

= LinearLayoutManager(this)

recyclerView.layoutManager = layoutManager

val dataSet: ArrayList<String> = arrayListOf()

var i = 0

while (i < 20) {

val str: String = java.lang.String.format(Locale.US, "Data_0%d", i)

dataSet.add(str)

i++

}

recyclerView.adapter = MyAdapter(dataSet)

val itemDecoration: ItemDecoration =

DividerItemDecoration(this, DividerItemDecoration.VERTICAL)

recyclerView.addItemDecoration(itemDecoration)

val adapter = recyclerView.adapter as MyAdapter

val mIth = ItemTouchHelper(

object : ItemTouchHelper.SimpleCallback(

ItemTouchHelper.UP or ItemTouchHelper.DOWN,

ItemTouchHelper.LEFT

) {

override fun onMove(

recyclerView: RecyclerView,

viewHolder: RecyclerView.ViewHolder,

target: RecyclerView.ViewHolder

): Boolean {

val fromPos = viewHolder.bindingAdapterPosition

val toPos = target.bindingAdapterPosition

adapter.notifyItemMoved(fromPos, toPos)

return true // true if moved, false otherwise

}

override fun onSwiped(viewHolder: RecyclerView.ViewHolder,

direction: Int) {

dataSet.removeAt(viewHolder.bindingAdapterPosition)

adapter.notifyItemRemoved(viewHolder.bindingAdapterPosition)

}

})

mIth.attachToRecyclerView(recyclerView)

}

　
アダプターです
MyAdapter.kt

//package your.package.name

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

class MyAdapter(private val dataSet: ArrayList<String>):
    RecyclerView.Adapter<MyAdapter.ViewHolder>() {

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val textView: TextView

        init {
            // Define click listener for the ViewHolder's View.
            textView = view.findViewById(R.id.text_view)
        }
    }

    // Create new views (invoked by the layout manager)
    override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int):
            ViewHolder {
        // Create a new view, which defines the UI of the list item
        val view = LayoutInflater.from(viewGroup.context)
            .inflate(R.layout.my_text_view, viewGroup, false)

        return ViewHolder(view)
    }

    // Replace the contents of a view (invoked by the layout manager)
    override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) {

        // Get element from your dataset at this position and replace the
        // contents of the view with that element
        viewHolder.textView.text = dataSet[position]
    }

    // Return the size of your dataset (invoked by the layout manager)
    override fun getItemCount() = dataSet.size
}

//package your.package.name

import android.view.LayoutInflater

import android.view.View

import android.view.ViewGroup

import android.widget.TextView

import androidx.recyclerview.widget.RecyclerView

class MyAdapter(private val dataSet: ArrayList<String>):

RecyclerView.Adapter<MyAdapter.ViewHolder>() {

class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {

val textView: TextView

init {

// Define click listener for the ViewHolder's View.

textView = view.findViewById(R.id.text_view)

}

// Create new views (invoked by the layout manager)

override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int):

ViewHolder {

// Create a new view, which defines the UI of the list item

val view = LayoutInflater.from(viewGroup.context)

.inflate(R.layout.my_text_view, viewGroup, false)

return ViewHolder(view)

}

// Replace the contents of a view (invoked by the layout manager)

override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) {

// Get element from your dataset at this position and replace the

// contents of the view with that element

viewHolder.textView.text = dataSet[position]

}

// Return the size of your dataset (invoked by the layout manager)

override fun getItemCount() = dataSet.size

}

その他ファイル

メインのレイアウト
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">

    <!-- A RecyclerView with some commonly used attributes -->
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?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/my_recycler_view"

android:scrollbars="vertical"

android:layout_width="match_parent"

android:layout_height="match_parent"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

　
リスト要素のレイアウト
my_text_view.xml

<?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">

    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="50dp" />

</LinearLayout>

<?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">

<TextView

android:id="@+id/text_view"

android:layout_width="wrap_content"

android:layout_height="50dp" />

</LinearLayout>

　
gradleの追加設定、バージョンは適宜合わせてください
build.gradle

dependencies {
    ...
    implementation 'androidx.recyclerview:recyclerview:1.2.1'
}

dependencies {

...

implementation 'androidx.recyclerview:recyclerview:1.2.1'

}

これで、リストのドラッグ＆ドロップとスワイプ消去ができました。
ドラッグするときは、
リストのスクロールとの区別のため長押しで機能します。
　

画像・テキストリストでのItemTouchHelper

　
前に試した画像を加えた例にItemTouchHelperを追加してみましょう。
　

MainActivity.kt

//package your.package.name

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.ItemDecoration
import java.util.*
import kotlin.collections.ArrayList

class MainActivity : AppCompatActivity() {

    private val names: ArrayList<String> = arrayListOf(
        "Bellflower", "Bougainvillea", "Cosmos", "Cosmos field",
        "Delphinium", "Flowers", "Lotus", "Spring Flowers"
    )

    private val photos: ArrayList<Int> = arrayListOf(
        R.drawable.bellflower, R.drawable.bougainvillea,
        R.drawable.cosmos, R.drawable.cosmos_field,
        R.drawable.delphinium, R.drawable.flowers,
        R.drawable.lotus, R.drawable.spring_flowers
    )

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

        val recyclerView = findViewById<RecyclerView>(R.id.my_recycler_view)

        recyclerView.setHasFixedSize(true)
        val layoutManager: RecyclerView.LayoutManager = LinearLayoutManager(this)
        recyclerView.layoutManager = layoutManager

//        val dataSet: ArrayList<String> = arrayListOf()
//        var i = 0
//        while (i < 20) {
//            val str: String = java.lang.String.format(Locale.US, "Data_0%d", i)
//            dataSet.add(str)
//            i++
//        }

        recyclerView.adapter = MyAdapter(photos, names)

        val itemDecoration: ItemDecoration =
            DividerItemDecoration(this, DividerItemDecoration.VERTICAL)
        recyclerView.addItemDecoration(itemDecoration)

        val adapter = recyclerView.adapter as MyAdapter

        val mIth = ItemTouchHelper(
            object : ItemTouchHelper.SimpleCallback(
                ItemTouchHelper.UP or ItemTouchHelper.DOWN,
                ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT
            ) {
                override fun onMove(
                    recyclerView: RecyclerView,
                    viewHolder: RecyclerView.ViewHolder,
                    target: RecyclerView.ViewHolder
                ): Boolean {
                    val fromPos = viewHolder.bindingAdapterPosition
                    val toPos = target.bindingAdapterPosition
                    adapter.notifyItemMoved(fromPos, toPos)
                    return true // true if moved, false otherwise
                }

                override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
                    photos.removeAt(viewHolder.bindingAdapterPosition)
                    names.removeAt(viewHolder.bindingAdapterPosition)

                    adapter.notifyItemRemoved(viewHolder.bindingAdapterPosition)
                }
            })

        mIth.attachToRecyclerView(recyclerView)
    }
}

//package your.package.name

import android.os.Bundle

import androidx.appcompat.app.AppCompatActivity

import androidx.recyclerview.widget.DividerItemDecoration

import androidx.recyclerview.widget.ItemTouchHelper

import androidx.recyclerview.widget.LinearLayoutManager

import androidx.recyclerview.widget.RecyclerView

import androidx.recyclerview.widget.RecyclerView.ItemDecoration

import java.util.*

import kotlin.collections.ArrayList

class MainActivity : AppCompatActivity() {

private val names: ArrayList<String> = arrayListOf(

"Bellflower", "Bougainvillea", "Cosmos", "Cosmos field",

"Delphinium", "Flowers", "Lotus", "Spring Flowers"

)

private val photos: ArrayList<Int> = arrayListOf(

R.drawable.bellflower, R.drawable.bougainvillea,

R.drawable.cosmos, R.drawable.cosmos_field,

R.drawable.delphinium, R.drawable.flowers,

R.drawable.lotus, R.drawable.spring_flowers

)

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

val recyclerView = findViewById<RecyclerView>(R.id.my_recycler_view)

recyclerView.setHasFixedSize(true)

val layoutManager: RecyclerView.LayoutManager = LinearLayoutManager(this)

recyclerView.layoutManager = layoutManager

// val dataSet: ArrayList<String> = arrayListOf()

// var i = 0

// while (i < 20) {

// val str: String = java.lang.String.format(Locale.US, "Data_0%d", i)

// dataSet.add(str)

// i++

// }

recyclerView.adapter = MyAdapter(photos, names)

val itemDecoration: ItemDecoration =

DividerItemDecoration(this, DividerItemDecoration.VERTICAL)

recyclerView.addItemDecoration(itemDecoration)

val adapter = recyclerView.adapter as MyAdapter

val mIth = ItemTouchHelper(

object : ItemTouchHelper.SimpleCallback(

ItemTouchHelper.UP or ItemTouchHelper.DOWN,

ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT

) {

override fun onMove(

recyclerView: RecyclerView,

viewHolder: RecyclerView.ViewHolder,

target: RecyclerView.ViewHolder

): Boolean {

val fromPos = viewHolder.bindingAdapterPosition

val toPos = target.bindingAdapterPosition

adapter.notifyItemMoved(fromPos, toPos)

return true // true if moved, false otherwise

}

override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {

photos.removeAt(viewHolder.bindingAdapterPosition)

names.removeAt(viewHolder.bindingAdapterPosition)

adapter.notifyItemRemoved(viewHolder.bindingAdapterPosition)

}

})

mIth.attachToRecyclerView(recyclerView)

}

　
MyAdapter.kt

//package your.package.name

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class MyAdapter(private val iImages: ArrayList<Int>,
                private val iNames: ArrayList<String>):
    RecyclerView.Adapter<MyAdapter.ViewHolder>() {


    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val textView: TextView
        val imageView: ImageView

        init {
            // Define click listener for the ViewHolder's View.
            textView = view.findViewById(R.id.text_view)
            imageView = view.findViewById(R.id.image_view)
        }
    }

    // Create new views (invoked by the layout manager)
    override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int): ViewHolder {
        // Create a new view, which defines the UI of the list item
        val view = LayoutInflater.from(viewGroup.context)
            .inflate(R.layout.my_text_view, viewGroup, false)

        return ViewHolder(view)
    }

    // Replace the contents of a view (invoked by the layout manager)
    override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) {

        // Get element from your dataset at this position and replace the
        // contents of the view with that element
        viewHolder.imageView.setImageResource(iImages.get(position))
        viewHolder.textView.text = iNames[position]
    }

    // Return the size of your dataset (invoked by the layout manager)
    override fun getItemCount() = iNames.size
}

//package your.package.name

import android.view.LayoutInflater

import android.view.View

import android.view.ViewGroup

import android.widget.ImageView

import android.widget.TextView

import androidx.recyclerview.widget.RecyclerView

class MyAdapter(private val iImages: ArrayList<Int>,

private val iNames: ArrayList<String>):

RecyclerView.Adapter<MyAdapter.ViewHolder>() {

class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {

val textView: TextView

val imageView: ImageView

init {

// Define click listener for the ViewHolder's View.

textView = view.findViewById(R.id.text_view)

imageView = view.findViewById(R.id.image_view)

}

// Create new views (invoked by the layout manager)

override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int): ViewHolder {

// Create a new view, which defines the UI of the list item

val view = LayoutInflater.from(viewGroup.context)

.inflate(R.layout.my_text_view, viewGroup, false)

return ViewHolder(view)

}

// Replace the contents of a view (invoked by the layout manager)

override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) {

// Get element from your dataset at this position and replace the

// contents of the view with that element

viewHolder.imageView.setImageResource(iImages.get(position))

viewHolder.textView.text = iNames[position]

}

// Return the size of your dataset (invoked by the layout manager)

override fun getItemCount() = iNames.size

}

その他ファイル

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">

    <!-- A RecyclerView with some commonly used attributes -->
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?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/my_recycler_view"

android:scrollbars="vertical"

android:layout_width="match_parent"

android:layout_height="match_parent"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

　
my_text_view.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:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingStart="20dp"
    android:paddingTop="5dp"
    android:baselineAligned="false"
    tools:ignore="RtlSymmetry,UseCompoundDrawables">

    <ImageView
        android:id="@+id/image_view"
        android:layout_margin="2dp"
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:contentDescription="@string/description"/>

    <TextView
        android:id="@+id/text_view"
        android:textSize="24sp"
        android:paddingStart="20dp"
        android:paddingEnd="10dp"
        android:paddingTop="50dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

<?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:orientation="horizontal"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:paddingStart="20dp"

android:paddingTop="5dp"

android:baselineAligned="false"

tools:ignore="RtlSymmetry,UseCompoundDrawables">

<ImageView

android:id="@+id/image_view"

android:layout_margin="2dp"

android:layout_width="120dp"

android:layout_height="120dp"

android:contentDescription="@string/description"/>

<TextView

android:id="@+id/text_view"

android:textSize="24sp"

android:paddingStart="20dp"

android:paddingEnd="10dp"

android:paddingTop="50dp"

android:layout_width="wrap_content"

android:layout_height="wrap_content" />

</LinearLayout>

　
strings.xml

<resources>
    <string name="app_name">Your App Name</string>
    <string name="description">picture</string>
</resources>

<string name="description">picture</string>

</resources>

　
build.gradle

...
dependencies {
    ...
    implementation 'androidx.recyclerview:recyclerview:1.2.1'
}

...

dependencies {

...

implementation 'androidx.recyclerview:recyclerview:1.2.1'

}

　
関連ページ

RecyclerView の基本的な設定
RecyclerViewとItemTouchHelperでドラッグ&ドロップ

References:
ItemTouchHelper
リストとカードの作成
 ItemTouchHelper.SimpleCallback