Second

app/src/main/java/edu/temple/inclassactivity/ImageDisplayFragment.kt

@@ -9,6 +9,7 @@ import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.lifecycle.ViewModelProvider
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 
@@ -18,6 +19,10 @@ class ImageDisplayFragment : Fragment() {
 
     private lateinit var images: IntArray
 
+    private val mainViewModel : MainViewModel by lazy{
+        ViewModelProvider(requireActivity())[MainViewModel::class.java]
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         // If we have arguments
@@ -40,7 +45,10 @@ class ImageDisplayFragment : Fragment() {
         // The recycler view is the root element of the Fragment's layout
         // as such the view argument passed to onViewCreated() is the RecyclerView
         with (view as RecyclerView) {
-            adapter = CustomRecyclerAdapter(images)
+            mainViewModel.getImageIds().observe(requireActivity()){
+                adapter = CustomRecyclerAdapter(it)
+            }
+
             layoutManager = GridLayoutManager(requireContext(), 2)
         }
     }

app/src/main/java/edu/temple/inclassactivity/MainActivity.kt

@@ -2,18 +2,26 @@ package edu.temple.inclassactivity
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.lifecycle.ViewModelProvider
 
 class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
+        val mainViewModel = ViewModelProvider(this)[MainViewModel::class.java]
+
         // Fetch images into IntArray called imageArray
         val typedArray = resources.obtainTypedArray(R.array.image_ids)
         val imageArray = IntArray(typedArray.length()) {typedArray.getResourceId(it, 0)}
         typedArray.recycle()
 
-        // Attach an instance of ImageDisplayFragment using factory method
+        mainViewModel.setImageIds(imageArray)
 
+        // Attach an instance of ImageDisplayFragment using factory method
+        //val fragment = ImageDisplayFragment.newInstance(imageArray)
+        val fragmentT = supportFragmentManager.beginTransaction()
+        fragmentT.add(R.id.fragmentContainerView, ImageDisplayFragment())
+        fragmentT.commit()
     }
 }

app/src/main/java/edu/temple/inclassactivity/MainViewModel.kt

@@ -0,0 +1,20 @@
+package edu.temple.inclassactivity
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class MainViewModel: ViewModel() {
+    private val imageIds = MutableLiveData<IntArray>()
+
+
+    fun setImageIds(imageIds: IntArray){
+        this.imageIds.value = imageIds
+    }
+
+    fun getImageIds(): LiveData<IntArray>{
+        return imageIds
+    }
+
+
+}

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

@@ -5,4 +5,14 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".MainActivity">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentContainerView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:layout="@layout/fragment_image_display" />
 </androidx.constraintlayout.widget.ConstraintLayout>