Fragment communication

app/src/main/java/edu/temple/dicethrow/ButtonFragment.kt

@@ -0,0 +1,28 @@
+package edu.temple.dicethrow
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+
+class ButtonFragment : Fragment() {
+
+    interface ButtonOnclickListener {
+        fun onClick()
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_button, container, false).apply {
+            if(context is ButtonOnclickListener)
+                this.findViewById<Button>(R.id.rollDiceButton).setOnClickListener {
+                    (context as ButtonOnclickListener).onClick()
+                }
+        }
+    }
+}

app/src/main/java/edu/temple/dicethrow/DieFragment.kt

@@ -11,18 +11,22 @@ import kotlin.random.Random
 class DieFragment : Fragment() {
 
     val DIESIDE = "sidenumber"
+    val DIEVALUE = "dievalue"
 
     lateinit var dieTextView: TextView
 
     var dieSides: Int = 6
+    var dieValue: Int = 0
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
         arguments?.let {
-            it.getInt(DIESIDE).run {
-                dieSides = this
-            }
+            dieSides = it.getInt(DIESIDE)
         }
+
+        if(savedInstanceState != null)
+            dieValue = savedInstanceState.getInt(DIEVALUE)
     }
 
     override fun onCreateView(
@@ -35,15 +39,31 @@ class DieFragment : Fragment() {
         }
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putInt(DIEVALUE, dieValue)
+    }
+
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        throwDie()
-        view.setOnClickListener{
+        if(dieValue == 0)
             throwDie()
-        }
+        else
+            dieTextView.text = dieValue.toString()
     }
 
     fun throwDie() {
-        dieTextView.text = Random.nextInt(dieSides).toString()
+        dieValue = Random.nextInt(dieSides).plus(1)
+        dieTextView.text = dieValue.toString()
+    }
+
+    companion object {
+        @JvmStatic
+        fun newInstance(dieSides: Int) =
+            DieFragment().apply {
+                arguments = Bundle().apply {
+                    putInt(DIESIDE, dieSides)
+                }
+            }
     }
 }

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

@@ -1,14 +1,23 @@
 package edu.temple.dicethrow
 
 import android.os.Bundle
-import androidx.activity.enableEdgeToEdge
+import android.util.Log
+import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowInsetsCompat
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : AppCompatActivity(), ButtonFragment.ButtonOnclickListener {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        if(supportFragmentManager.findFragmentById(R.id.dieContainer) !is DieFragment)
+            supportFragmentManager.beginTransaction()
+                .replace(R.id.dieContainer, DieFragment.newInstance(10))
+                .commit()
+
+    }
+
+    override fun onClick() {
+        (supportFragmentManager.findFragmentById(R.id.dieContainer) as DieFragment).throwDie()
     }
 }

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

@@ -8,22 +8,23 @@
     tools:context=".MainActivity">
 
     <androidx.fragment.app.FragmentContainerView
-        android:id="@+id/fragmentContainerView"
-        android:name="edu.temple.dicethrow.DieFragment"
+        android:id="@+id/dieContainer"
         android:layout_width="0dp"
         android:layout_height="0dp"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintHeight_percent=".4"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-    <Button
-        android:id="@+id/rollDiceButton"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="ROLL"
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/buttonContainer"
+        android:name="edu.temple.dicethrow.ButtonFragment"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.0"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toBottomOf="@+id/dieContainer" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,20 @@
+<?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:id="@+id/frameLayout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ButtonFragment">
+
+    <Button
+        android:id="@+id/rollDiceButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="ROLL"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

gradle/libs.versions.toml

@@ -5,9 +5,9 @@ coreKtx = "1.13.1"
 junit = "4.13.2"
 junitVersion = "1.2.1"
 espressoCore = "3.6.1"
-appcompat = "1.6.1"
-material = "1.10.0"
-activity = "1.9.2"
+appcompat = "1.7.0"
+material = "1.12.0"
+activity = "1.9.3"
 constraintlayout = "2.1.4"
 
 [libraries]