سورس کد نمایش لیست در کاتلین – آموزش برنامه نویسی kotlin

    implementation 'com.readystatesoftware.sqliteasset:sqliteassethelper:2.0.1'

package com.tejariapp.kotlinprac.db

import android.content.Context
import com.readystatesoftware.sqliteasset.SQLiteAssetHelper

class DataBaseOpenHelper(context: Context) : SQLiteAssetHelper(context, DATABASE_NAME, null, DATABASE_VERSION) {
    companion object {
        private val DATABASE_NAME = "BooksDB.db"
        private val DATABASE_VERSION = 1
    }
}

package com.tejariapp.kotlinprac.db

data class Books(val  id:Int,val name: String , val img: String , val date:String , val writer: String)

package com.tejariapp.kotlinprac.db

import android.content.Context
import android.database.Cursor
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteOpenHelper
import java.util.*

class DatabaseAccess private constructor(context: Context) {

    private val openHelper: SQLiteOpenHelper
    private lateinit var db: SQLiteDatabase
    lateinit var c: Cursor

    init {
        this.openHelper = DataBaseOpenHelper(context)
    }


    // open database connection
  private  fun open() {
        this.db = openHelper.writableDatabase
    }

    // close database connection
   private fun close() {
        this.db.close()
    }

    companion object {
        private var instance: DatabaseAccess? = null

        fun getInstance(context: Context): DatabaseAccess {
            if (instance == null)
                instance = DatabaseAccess(context)
            return instance as DatabaseAccess
        }
    }

   fun getBooks(): ArrayList<Books> {
        open()
        val data = ArrayList<Books>()
        c = db.query("tbl_books", arrayOf("id", "name", "img", "date", "writer"), null, null, null, null, null)
        while (c.moveToNext()) {
            data.add(Books(c.getInt(0), c.getString(1), c.getString(2)
                , c.getString(3), c.getString(4)))
        }
        close()
        return data
    }
}

<android.support.v7.widget.RecyclerView
        android:id="@+id/recycler"
        android:layout_width="match_parent"
        android:layout_height="match_parent" app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    app:cardCornerRadius="5dp"
    app:cardElevation="5dp">

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">


        <ImageView
            android:id="@+id/iv_profile"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@mipmap/ic_launcher" />

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            android:text="نام کتاب :"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.5"
            app:layout_constraintStart_toEndOf="@+id/tv_name"
            app:layout_constraintTop_toBottomOf="@+id/iv_profile" />

        <TextView
            android:id="@+id/tv_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:gravity="right"
            android:text="TextView"
            app:layout_constraintEnd_toStartOf="@+id/textView"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintHorizontal_chainStyle="packed"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/textView" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            android:text="نام نویسنده کتاب :"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.5"
            app:layout_constraintStart_toEndOf="@+id/tv_writer"
            app:layout_constraintTop_toBottomOf="@+id/tv_name" />

        <TextView
            android:id="@+id/tv_writer"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:gravity="right"
            android:text="TextView"
            app:layout_constraintEnd_toStartOf="@+id/textView3"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintHorizontal_chainStyle="packed"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/textView3" />

        <TextView
            android:id="@+id/textView5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            android:text="سال انتشار کتاب :"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.5"
            app:layout_constraintStart_toEndOf="@+id/tv_date"
            app:layout_constraintTop_toBottomOf="@+id/tv_writer" />

        <TextView
            android:id="@+id/tv_date"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:gravity="right"
            android:text="TextView"
            app:layout_constraintEnd_toStartOf="@+id/textView5"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintHorizontal_chainStyle="packed"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/textView5" />
    </android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>

package com.tejariapp.kotlinprac

import android.content.Context
import android.support.v7.widget.RecyclerView
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import com.bumptech.glide.Glide
import com.tejariapp.kotlinprac.db.Books
import kotlinx.android.synthetic.main.view_book_item.view.*

class BooksAdapter(private val mContext: Context, private val mList: ArrayList<Books>) : RecyclerView.Adapter<BooksAdapter.MyViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, pos: Int): MyViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.view_book_item, parent, false)
        return MyViewHolder(view)
    }

    override fun getItemCount(): Int = mList.size

    override fun onBindViewHolder(holder: MyViewHolder, pos: Int) {
        val book = mList[pos]
        holder.setItems(mContext,book)
    }

    class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun setItems(mContext: Context,book: Books) {
            itemView.tv_name.text = book.name
            itemView.tv_date.text = book.date
            itemView.tv_writer.text = book.writer

            Glide
                .with(mContext)
                .load(book.img)
                .centerCrop()
                .placeholder(R.mipmap.ic_launcher)
                .into(itemView.iv_profile)
        }
    }
}

https://github.com/bumptech/glide

build.gradle (app)
    implementation 'com.github.bumptech.glide:glide:4.9.0'


build.gradle (project)

repositories {
  mavenCentral()
  google()
}

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

   override fun getItemCount(): Int = mList.size

package com.tejariapp.kotlinprac

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v7.widget.LinearLayoutManager
import android.support.v7.widget.RecyclerView
import android.util.Log
import android.widget.Toast
import com.tejariapp.kotlinprac.db.Books
import com.tejariapp.kotlinprac.db.DatabaseAccess
import kotlinx.android.synthetic.main.activity_main.*

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

        recycler.layoutManager = LinearLayoutManager(this)

        getData()
    }

    private fun getData(){
        var list: ArrayList<Books>
        val access = DatabaseAccess.getInstance(this)

        list = access.getBooks()

        recycler.adapter = BooksAdapter(this,list)
    }
}