Add sqlite dependency with flutter pub add sqflite.

lib/main.dart

@@ -118,11 +118,9 @@ class _HomePageState extends State<HomePage> {
             });
           },
         ),
-        body: Center(
+        body: Container(
-          child: Container(
+          color: Theme.of(context).colorScheme.primaryContainer,
-            color: Theme.of(context).colorScheme.primaryContainer,
+          child: Center(child: page),
-            child: page,
-          ),
         ),
         floatingActionButton: floatingButton,
       );

lib/pages/expense.dart

@@ -12,29 +12,31 @@ class ExpensePage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return ListView.builder(
+    return expenses.isEmpty
-      itemCount: expenses.length,
+        ? Text("Add expenses to get started!")
-      itemBuilder: (_, index) {
+        : ListView.builder(
-        final Expense curr = expenses[index];
+            itemCount: expenses.length,
-        return Center(
+            itemBuilder: (_, index) {
-          child: Padding(
+              final Expense curr = expenses[index];
-            padding: const EdgeInsets.all(4.0),
+              return Center(
-            child: Container(
+                child: Padding(
-              decoration: BoxDecoration(
+                  padding: const EdgeInsets.all(4.0),
-                borderRadius: BorderRadius.circular(4),
+                  child: Container(
-                color: Colors.greenAccent,
+                    decoration: BoxDecoration(
-              ),
+                      borderRadius: BorderRadius.circular(4),
-              child: Column(
+                      color: Colors.greenAccent,
-                children: [
+                    ),
-                  Text(curr.name),
+                    child: Column(
-                  Text("${curr.cost.toString()} ${curr.frequency.title}"),
+                      children: [
-                ],
+                        Text(curr.name),
-              ),
+                        Text("${curr.cost.toString()} ${curr.frequency.title}"),
-            ),
+                      ],
-          ),
+                    ),
-        );
+                  ),
-      },
+                ),
-    );
+              );
+            },
+          );
   }
 }
 

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -5,6 +5,8 @@
 import FlutterMacOS
 import Foundation
 
+import sqflite_darwin
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
+  SqflitePlugin.register(with: registry.registrar(forPlugin: "SqflitePlugin"))
 }

pubspec.lock

@@ -131,6 +131,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.6"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.8"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -144,6 +160,46 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.10.0"
+  sqflite:
+    dependency: "direct main"
+    description:
+      name: sqflite
+      sha256: "2d7299468485dca85efeeadf5d38986909c5eb0cd71fd3db2c2f000e6c9454bb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  sqflite_android:
+    dependency: transitive
+    description:
+      name: sqflite_android
+      sha256: "78f489aab276260cdd26676d2169446c7ecd3484bbd5fead4ca14f3ed4dd9ee3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.0"
+  sqflite_common:
+    dependency: transitive
+    description:
+      name: sqflite_common
+      sha256: "761b9740ecbd4d3e66b8916d784e581861fd3c3553eda85e167bc49fdb68f709"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.4+6"
+  sqflite_darwin:
+    dependency: transitive
+    description:
+      name: sqflite_darwin
+      sha256: "22adfd9a2c7d634041e96d6241e6e1c8138ca6817018afc5d443fef91dcefa9c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1+1"
+  sqflite_platform_interface:
+    dependency: transitive
+    description:
+      name: sqflite_platform_interface
+      sha256: "8dd4515c7bdcae0a785b0062859336de775e8c65db81ae33dd5445f35be61920"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.0"
   stack_trace:
     dependency: transitive
     description:
@@ -168,6 +224,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.0"
+  synchronized:
+    dependency: transitive
+    description:
+      name: synchronized
+      sha256: "69fe30f3a8b04a0be0c15ae6490fc859a78ef4c43ae2dd5e8a623d45bfcf9225"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.3.0+3"
   term_glyph:
     dependency: transitive
     description:
@@ -202,4 +266,4 @@ packages:
     version: "14.3.0"
 sdks:
   dart: ">=3.6.1 <4.0.0"
-  flutter: ">=3.18.0-18.0.pre.54"
+  flutter: ">=3.24.0"

pubspec.yaml

@@ -9,6 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  sqflite: ^2.4.1
 
 dev_dependencies:
   flutter_test: