Idealim
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Published 2021. 7. 20. 14:52
[Android] ViewBinding 을 사용한 CardView RecylcerView Android/Android with Kotlin

/* 본 게시물은 ' ' 의 내용을 토대로 작성되었습니다. */

0.1. 참고 자료

[RecyclerView에 View Binding 적용하기] : https://cliearl.github.io/posts/android/viewbinding-recyclerview/

[RecyclerView 클릭 이벤트 적용하기] : https://yunaaaas.tistory.com/57

1. #CardView RecyclerView

 

Dependency 추가


      

      

      

    

    

      <kotlin />
    
android {   
    viewBinding {
        enabled = true
    }
}

dependencies {
    implementation 'androidx.cardview:cardview:1.0.0'
}

 

MainActivity


      

      

      

    

    

      <kotlin />
    
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.cardviewtest.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        var recyclerView = binding.recyclerviewMain

        var layoutManager = LinearLayoutManager(this).apply {
            this.orientation = LinearLayoutManager.HORIZONTAL
        }

        recyclerView.layoutManager = layoutManager
        val customAdapter = CustomAdapter()
        recyclerView.adapter = customAdapter

    }
}
  • LinearLayoutManager.HORIZONTAL : RecyclerView의 스코롤을 가로 방향으로 설정한다.

CardData


      

      

      

    

    

      <kotlin />
    
data class CardData(val title: String, val detail: String, val image: Int) : Serializable
  • 카드에 들어갈 정보를 담을 데이터 클래스이다. Adapter에서 DetailActivity로 Intent을 이용해 넘기기 위해 Serializable을 상속 받았다. 

CustomAdapter


      

      

      

    

    

      <kotlin />
    
import android.content.Intent
import android.view.LayoutInflater
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.example.cardviewtest.databinding.CardLayoutBinding


class CustomAdapter : RecyclerView.Adapter<CustomAdapter.ViewHolder>() {

    val cardDataList : ArrayList<CardData> = arrayListOf(
        CardData("one","Item one", R.drawable.beach),
        CardData("two","Item two", R.drawable.wave),
        CardData("three", "Item three", R.drawable.young_woman),
        CardData("four", "Item four", R.drawable.young_woman),
        CardData("five", "Item five", R.drawable.beach)
    )


    override fun onCreateViewHolder(parent: ViewGroup, position: Int): ViewHolder {
        val binding = CardLayoutBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return ViewHolder(binding)
    }

    class ViewHolder(binding: CardLayoutBinding) : RecyclerView.ViewHolder(binding.root){
        val itemTitle: TextView = binding.itemTitle
        val itemImage: ImageView = binding.itemImage
        val itemDetail: TextView = binding.itemDetail

    }
    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.itemTitle.text = cardDataList[position].title
        holder.itemDetail.text = cardDataList[position].detail
        holder.itemImage.setImageResource(cardDataList[position].image)
        holder.itemView.setOnClickListener{
//          Toast.makeText(it.context,"클릭", Toast.LENGTH_SHORT).show()
            val data = cardDataList[position]

            val intent = Intent(holder.itemView.context, DetailActivity::class.java).apply {
                putExtra("data", data)
            }
            holder.itemView.context.startActivity(intent)

        }
    }

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

}
  • binding : ViewBinding을 이용해 card_layout.xml 과 바인딩을 한다.
  • holder.itemView 에 ClickListener를 달아 클릭 시 DetailActivity를 실행한다.

DetailActivity


      

      

      

    

    

      <kotlin />
    
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.example.cardviewtest.databinding.ActivityDetailBinding

class DetailActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val data = intent.getSerializableExtra("data") as CardData

        val binding = ActivityDetailBinding.inflate(layoutInflater).apply {
            this.detailImageView.setImageResource(data.image)
            this.detailTitle.text = data.title
            this.detailDetail.text = data.detail
        }
        setContentView(binding.root)

    }
}
  • Intent로 Serializable 객체를 넘겨받을 때는 .getSerializableExtra()를 사용한다. 

Xml file

 

1. activity_main.xml


      

      

      

    

    

      <kotlin />
    
<?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/recyclerview_main"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">
    </androidx.recyclerview.widget.RecyclerView>

</androidx.constraintlayout.widget.ConstraintLayout>

2. activity_detail.xml


      

      

      

    

    

      <kotlin />
    
<?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">

    <TextView
        android:id="@+id/detail_detail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="44dp"
        android:text="TextView"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/detail_title" />

    <ImageView
        android:id="@+id/detail_imageView"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_marginTop="136dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

    <TextView
        android:id="@+id/detail_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:text="TextView"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/detail_imageView" />

</androidx.constraintlayout.widget.ConstraintLayout>

3. card_layout_xml


      

      

      

    

    

      <kotlin />
    
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/card_view"
    android:layout_margin="5dp"
    card_view:cardBackgroundColor="#81C784"
    card_view:cardCornerRadius="12dp"
    card_view:cardElevation="3dp"
    card_view:contentPadding="4dp"
    >

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="16dp">

        <ImageView
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:id="@+id/item_image"
            android:layout_alignParentStart="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp" />


        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/item_title"
            android:layout_toEndOf="@+id/item_image"
            android:layout_toRightOf="@id/item_image"
            android:layout_alignParentTop="true"
            android:textSize="30sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/item_detail"
            android:layout_toEndOf="@+id/item_image"
            android:layout_toRightOf="@+id/item_image"
            android:layout_below="@+id/item_title">
        </TextView>

    </RelativeLayout>

</androidx.cardview.widget.CardView>

실행결과

2. #궁금한 점

Adapter에서 activity context를 받지 말고 activity에서 클릭 이벤트를 실행할 수 없을까?
[RecyclerView 클릭 이벤트 적용하기] : https://yunaaaas.tistory.com/57 
interface OnClickListener를 이용하여 가능.

itemView.context를 이용해도 액티비티를 실행할 수 있음.

2.1. 관련글

[RecyclerView 더 잘 쓰기] : https://gamjatwigim.tistory.com/120

3. 1. recyclerView 이동 버튼 추가

3.1. 관련글

URL : https://android--code.blogspot.com/2020/08/android-kotlin-recyclerview-smooth.html 


      

      

      

    

    

      <kotlin />
    
class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        
		//...

        binding.goFirstBtn.setOnClickListener {
            recyclerView.smoothScrollToPosition(0)
        }

        binding.goMidBtn.setOnClickListener {
            recyclerView.smoothScrollToPosition(customAdapter.cardDataList.size / 2)
        }

        binding.goLastBtn.setOnClickListener {
            recyclerView.smoothScrollToPosition(customAdapter.cardDataList.size - 1)
        }
    }
}

실행 결과

 

 

 

 
 

 

 

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Idealim

@Idealim

읽어주셔서 감사합니다. 잘못된 내용이 있으면 언제든 댓글로 피드백 부탁드립니다.

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