Replaced fragment switching functionality in MainActivity.kt with Navigation component, simplifying logic significantly; upgraded to AGP 8.0.1

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

@@ -13,6 +13,7 @@
         android:layout_width="0dp"
         android:layout_height="0dp"
         app:defaultNavHost="true"
+        app:navGraph="@navigation/main_nav_graph"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintBottom_toTopOf="@+id/nav_view"
         app:layout_constraintStart_toStartOf="parent"

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

@@ -44,6 +44,15 @@
 
             </androidx.appcompat.widget.LinearLayoutCompat>
 
+            <TextView
+                android:id="@+id/app_title_bar"
+                android:layout_width="match_parent"
+                android:layout_height="48dp"
+                android:text="@string/title_food"
+                android:textSize="32sp"
+                android:fontFamily="@font/lato_bolditalic"
+                android:layout_marginHorizontal="16dp"/>
+
             <HorizontalScrollView
                 android:id="@+id/scroll_view_chip"
                 android:layout_width="match_parent"
@@ -181,15 +190,6 @@
 
             </HorizontalScrollView>
 
-            <TextView
-                android:id="@+id/app_title_bar"
-                android:layout_width="match_parent"
-                android:layout_height="48dp"
-                android:text="@string/title_food"
-                android:textSize="32sp"
-                android:fontFamily="@font/lato_bolditalic"
-                android:layout_marginHorizontal="16dp"/>
-
         </androidx.appcompat.widget.LinearLayoutCompat>
 
         <com.google.android.material.tabs.TabLayout

app/src/main/res/menu/nav_view_items.xml

@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
     <item
-        android:id="@+id/plan"
+        android:id="@+id/schedule"
         android:icon="@drawable/design"
         android:title="@string/nav_schedule"
         android:enabled="true"/>
     <item
-        android:id="@+id/food"
+        android:id="@+id/canteen"
         android:icon="@drawable/restaurant"
         android:title="@string/nav_food"
         android:enabled="true"/>

app/src/main/res/navigation/main_nav_graph.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation 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/main_nav_graph"
+    app:startDestination="@id/schedule">
+
+    <fragment
+        android:id="@+id/schedule"
+        android:name="com.denizk0461.studip.fragment.EventFragment"
+        android:label="EventFragment"
+        tools:layout="@layout/fragment_event"/>
+    <fragment
+        android:id="@+id/canteen"
+        android:name="com.denizk0461.studip.fragment.CanteenFragment"
+        android:label="CanteenFragment"/>
+    <fragment
+        android:id="@+id/settings"
+        android:name="com.denizk0461.studip.fragment.SettingsFragment"
+        android:label="SettingsFragment"
+        tools:layout="@layout/fragment_settings"/>
+</navigation>