study:

     - SwipeRefreshLayout 연습 2
     - Refresh and Shuffled sample string

Author: msnodeve

app/src/main/java/com/seok/gfd/views/GuestMain.kt

@@ -1,26 +1,32 @@
 package com.seok.gfd.views
 
 import android.os.Bundle
-import android.os.Handler
+import android.widget.ArrayAdapter
 import androidx.appcompat.app.AppCompatActivity
 import com.seok.gfd.R
 import kotlinx.android.synthetic.main.activity_guest_main.*
 import java.util.*
 
 class GuestMain : AppCompatActivity() {
+    private val arrayList =ArrayList<String>(listOf("First Element", "Second Element", "Third Element", "Fourth Element", "Fifth Element"))
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_guest_main)
 
+        val adapter = ArrayAdapter(this, R.layout.simple_list_item_1, arrayList)
+        listView.adapter = adapter
+
         simpleSwipeRefreshLayout.setOnRefreshListener {
-            Handler().postDelayed({
-                simpleSwipeRefreshLayout.isRefreshing = false
-                val r = Random()
-                val i1 : Int = r.nextInt(100)
-                guestTextView.text = i1.toString()
-            }, 3000)
+            simpleSwipeRefreshLayout.isRefreshing = false
+            shuffleItems()
         }
     }
 
+    private fun shuffleItems(){
+        arrayList.shuffle(Random(System.currentTimeMillis()))
+        val adapter = ArrayAdapter(this, R.layout.simple_list_item_1, arrayList)
+        listView.adapter = adapter
+    }
+
 }

app/src/main/res/layout/activity_guest_main.xml

@@ -1,6 +1,5 @@
 <?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"
@@ -17,20 +16,11 @@
                 android:orientation="horizontal"
                 android:padding="20dp">
 
-            <TextView
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="Random Number : "
-                    android:textColor="#000"
-                    android:textSize="20sp" />
-
-            <TextView
-                    android:id="@+id/guestTextView"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:textColor="#000"
-                    android:textSize="20sp" />
-
+            <ListView
+                    android:id="@+id/listView"
+                    android:layout_width="match_parent"
+                    android:layout_height="match_parent" />
         </LinearLayout>
+
     </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/simple_list_item_1.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<TextView
+
+        xmlns:android="http://schemas.android.com/apk/res/android"
+
+        android:id="@+id/TextView1"
+
+        android:layout_width="match_parent"
+
+        android:layout_height="wrap_content"
+
+        android:background="#cae682"
+
+        android:textColor="#aec7e1"
+
+        android:textSize="30dp" />