Auto frag inst

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

@@ -16,6 +16,8 @@ const val IMAGES_KEY = "imageList"
 
 class ImageDisplayFragment : Fragment() {
 
+    lateinit var someVar : Array<Int>
+
     private lateinit var images: IntArray
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -40,17 +42,17 @@ 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)
+            if (::someVar.isInitialized) adapter = CustomRecyclerAdapter(images)
             layoutManager = GridLayoutManager(requireContext(), 2)
         }
     }
 
-    companion object {
-        fun newInstance(images: IntArray) =
-            ImageDisplayFragment().apply {
-                arguments = Bundle().apply {
-                    putIntArray(IMAGES_KEY, images)
-                }
+    fun setImages(newImages : IntArray) {
+        images = newImages
+
+        view?.run {
+                (this as RecyclerView).adapter = CustomRecyclerAdapter(newImages)
             }
+        }
+
     }
-}

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

@@ -2,18 +2,34 @@ package edu.temple.inclassactivity
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.widget.Button
 
 class MainActivity : AppCompatActivity() {
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
+
+
         // 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()
 
+        findViewById<Button>(R.id.button).setOnClickListener {
+            (supportFragmentManager.findFragmentById(R.id.fragmentContainerView) as ImageDisplayFragment).setImages(
+                imageArray)
+        }
+
+
         // Attach an instance of ImageDisplayFragment using factory method
+        //val imageDisplayFragment = ImageDisplayFragment.newInstance(imageArray)
+
+        /*supportFragmentManager.beginTransaction()
+            .replace(R.id.fragmentContainerView, imageDisplayFragment)
+            .commit()
+         */
 
     }
 }

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

@@ -5,4 +5,24 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".MainActivity">
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragmentContainerView"
+        android:name="edu.temple.inclassactivity.ImageDisplayFragment"
+        android:layout_width="363dp"
+        android:layout_height="457dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.497"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.12" />
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Button"
+        tools:layout_editor_absoluteX="158dp"
+        tools:layout_editor_absoluteY="592dp" />
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/fragmentContainer"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".ImageDisplayFragment" />