Develop

.vscode/launch.json

@@ -0,0 +1,12 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+
+        {
+            "name": "flutter_billing_app",
+            "request": "launch",
+            "type": "dart",
+            "program": "lib/main.dart"
+        }
+    ]
+}

android/app/build.gradle.kts

@@ -1,13 +1,16 @@
 plugins {
     id("com.android.application")
+    // START: FlutterFire Configuration
+    id("com.google.gms.google-services")
+    // END: FlutterFire Configuration
     id("kotlin-android")
     // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id("dev.flutter.flutter-gradle-plugin")
 }
 
 android {
     namespace = "com.example.billing_app"
-    compileSdk = flutter.compileSdkVersion
+    compileSdk = 36
     ndkVersion = flutter.ndkVersion
 
     compileOptions {
@@ -20,21 +23,29 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId = "com.example.billing_app"
-        // You can update the following values to match your application needs.
-        // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion
-        targetSdk = flutter.targetSdkVersion
+        targetSdk = 36
         versionCode = flutter.versionCode
         versionName = flutter.versionName
+
     }
 
     buildTypes {
         release {
-            // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
             signingConfig = signingConfigs.getByName("debug")
+
+            // Enable R8 code shrinking + obfuscation
+            isMinifyEnabled = true
+
+            // Remove unused resources (layouts, drawables, strings, etc.)
+            isShrinkResources = true
+
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
         }
     }
 }

android/app/google-services.json

@@ -0,0 +1,29 @@
+{
+  "project_info": {
+    "project_number": "173409243741",
+    "project_id": "mobile-billing-app-14875",
+    "storage_bucket": "mobile-billing-app-14875.firebasestorage.app"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:173409243741:android:cd7f3b6e8d5d98ac70f3b4",
+        "android_client_info": {
+          "package_name": "com.example.billing_app"
+        }
+      },
+      "oauth_client": [],
+      "api_key": [
+        {
+          "current_key": "AIzaSyDo5OwnOmMJYOxiem3mOEDutfFmci3OTE0"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": []
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}

android/app/proguard-rules.pro

@@ -0,0 +1,46 @@
+# ─── Flutter Engine ─────────────────────────────────────────────────────────
+-keep class io.flutter.** { *; }
+-keep class io.flutter.plugins.** { *; }
+-keep class io.flutter.plugin.** { *; }
+-dontwarn io.flutter.**
+
+# ─── Firebase / Google Play Services ────────────────────────────────────────
+-keep class com.google.firebase.** { *; }
+-keep class com.google.android.gms.** { *; }
+-dontwarn com.google.firebase.**
+-dontwarn com.google.android.gms.**
+
+# ─── Hive ────────────────────────────────────────────────────────────────────
+-keep class com.hive.** { *; }
+-keep class io.hive.** { *; }
+# Keep all Hive-generated TypeAdapters (annotated with @HiveType)
+-keep @com.hive.annotation.HiveType class * { *; }
+-keepclassmembers class * {
+    @com.hive.annotation.HiveField *;
+}
+
+# ─── General Dart/Flutter reflection ─────────────────────────────────────────
+-keepattributes *Annotation*
+-keepattributes EnclosingMethod
+-keepattributes InnerClasses
+-keepattributes Signature
+
+# ─── Kotlin ──────────────────────────────────────────────────────────────────
+-keep class kotlin.** { *; }
+-keep class kotlinx.** { *; }
+-dontwarn kotlin.**
+
+# ─── Mobile Scanner (CameraX / MLKit) ────────────────────────────────────────
+-keep class com.google.mlkit.** { *; }
+-keep class androidx.camera.** { *; }
+-dontwarn com.google.mlkit.**
+
+# ─── Connectivity Plus ───────────────────────────────────────────────────────
+-dontwarn dev.fluttercommunity.plus.connectivity.**
+
+# ─── Remove verbose logging in release ───────────────────────────────────────
+-assumenosideeffects class android.util.Log {
+    public static *** d(...);
+    public static *** v(...);
+    public static *** i(...);
+}

android/app/src/main/AndroidManifest.xml

@@ -8,9 +8,9 @@
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 
     <application
-        android:label="billing_app"
+        android:label="QuickReceipt"
         android:name="${applicationName}"
-        android:icon="@mipmap/ic_launcher">
+        android:icon="@mipmap/launcher_icon">
         <activity
             android:name=".MainActivity"
             android:exported="true"
@@ -49,5 +49,9 @@
             <action android:name="android.intent.action.PROCESS_TEXT"/>
             <data android:mimeType="text/plain"/>
         </intent>
+        <intent>
+            <action android:name="android.intent.action.DIAL"/>
+            <data android:scheme="tel"/>
+        </intent>
     </queries>
 </manifest>

android/app/src/main/res/drawable-v21/launch_background.xml

@@ -1,12 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Modify this file to customize your launch splash screen -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="?android:colorBackground" />
-
-    <!-- You can insert your own image assets here -->
-    <!-- <item>
-        <bitmap
-            android:gravity="center"
-            android:src="@mipmap/launch_image" />
-    </item> -->
+    <item>
+        <bitmap android:gravity="fill" android:src="@drawable/background"/>
+    </item>
+    <item>
+        <bitmap android:gravity="center" android:src="@drawable/splash"/>
+    </item>
 </layer-list>

android/app/src/main/res/drawable/launch_background.xml

@@ -1,12 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Modify this file to customize your launch splash screen -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="@android:color/white" />
-
-    <!-- You can insert your own image assets here -->
-    <!-- <item>
-        <bitmap
-            android:gravity="center"
-            android:src="@mipmap/launch_image" />
-    </item> -->
+    <item>
+        <bitmap android:gravity="fill" android:src="@drawable/background"/>
+    </item>
+    <item>
+        <bitmap android:gravity="center" android:src="@drawable/splash"/>
+    </item>
 </layer-list>

android/app/src/main/res/values-night-v31/styles.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:forceDarkAllowed">false</item>
+        <item name="android:windowFullscreen">false</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">false</item>
+        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+         
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

android/app/src/main/res/values-night/styles.xml

@@ -5,6 +5,10 @@
         <!-- Show a splash screen on the activity. Automatically removed when
              the Flutter engine draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
+        <item name="android:forceDarkAllowed">false</item>
+        <item name="android:windowFullscreen">false</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">false</item>
+        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
     </style>
     <!-- Theme applied to the Android Window as soon as the process has started.
          This theme determines the color of the Android Window while your

android/app/src/main/res/values-v31/styles.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:forceDarkAllowed">false</item>
+        <item name="android:windowFullscreen">false</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">false</item>
+        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+         
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

android/app/src/main/res/values/styles.xml

@@ -5,6 +5,10 @@
         <!-- Show a splash screen on the activity. Automatically removed when
              the Flutter engine draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
+        <item name="android:forceDarkAllowed">false</item>
+        <item name="android:windowFullscreen">false</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">false</item>
+        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
     </style>
     <!-- Theme applied to the Android Window as soon as the process has started.
          This theme determines the color of the Android Window while your

android/build.gradle.kts

@@ -19,6 +19,25 @@ subprojects {
     project.evaluationDependsOn(":app")
 }
 
+// Force compileSdk 36 on all subprojects. If already evaluated, set immediately.
+subprojects {
+    if (project.name != "app") {
+        if (project.state.executed) {
+            val android = extensions.findByName("android")
+            if (android != null) {
+                (android as com.android.build.gradle.BaseExtension).compileSdkVersion(36)
+            }
+        } else {
+            afterEvaluate {
+                val android = extensions.findByName("android")
+                if (android != null) {
+                    (android as com.android.build.gradle.BaseExtension).compileSdkVersion(36)
+                }
+            }
+        }
+    }
+}
+
 tasks.register<Delete>("clean") {
     delete(rootProject.layout.buildDirectory)
 }

android/gradle.properties

@@ -1,2 +1,3 @@
 org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
 android.useAndroidX=true
+android.compileSdk=36

android/settings.gradle.kts

@@ -20,6 +20,9 @@ pluginManagement {
 plugins {
     id("dev.flutter.flutter-plugin-loader") version "1.0.0"
     id("com.android.application") version "8.11.1" apply false
+    // START: FlutterFire Configuration
+    id("com.google.gms.google-services") version("4.3.15") apply false
+    // END: FlutterFire Configuration
     id("org.jetbrains.kotlin.android") version "2.2.20" apply false
 }
 

devtools_options.yaml

@@ -0,0 +1,3 @@
+description: This file stores settings for Dart & Flutter DevTools.
+documentation: https://docs.flutter.dev/tools/devtools/extensions#configure-extension-enablement-states
+extensions:

firebase.json

@@ -0,0 +1 @@
+{"flutter":{"platforms":{"android":{"default":{"projectId":"mobile-billing-app-14875","appId":"1:173409243741:android:cd7f3b6e8d5d98ac70f3b4","fileOutput":"android/app/google-services.json"}},"dart":{"lib/firebase_options.dart":{"projectId":"mobile-billing-app-14875","configurations":{"android":"1:173409243741:android:cd7f3b6e8d5d98ac70f3b4","ios":"1:173409243741:ios:f28df3400476fa2370f3b4","web":"1:173409243741:web:1425976a5a8284f070f3b4"}}}}}}

fix_add.dart

@@ -0,0 +1,74 @@
+import 'dart:io';
+
+void main() {
+  final file = File('lib/features/product/presentation/pages/add_product_page.dart');
+  var content = file.readAsStringSync();
+
+  if (!content.contains('package:flutter/services.dart')) {
+    content = content.replaceFirst(
+        "import 'package:flutter/material.dart';", 
+        "import 'package:flutter/material.dart';\nimport 'package:flutter/services.dart';");
+  }
+
+  content = content.replaceFirst(
+    '''
+                  const SizedBox(height: 24),
+                  const InputLabel(text: 'Product Name'),
+                  TextFormField(
+                    decoration: const InputDecoration(
+                      hintText: 'e.g. Basmati Rice 1kg',
+                      prefixIcon: Icon(Icons.inventory_2_outlined,
+                          color: Color(0xFF94A3B8)),
+                    ),
+                    textCapitalization: TextCapitalization.words,
+                    validator: AppValidators.required('Please enter a name'),
+                    onSaved: (value) => _name = value!,
+                  ),''',
+    '''
+                  const SizedBox(height: 24),
+                  const InputLabel(text: 'Product Name'),
+                  TextFormField(
+                    decoration: const InputDecoration(
+                      hintText: 'e.g. Basmati Rice 1kg',
+                      prefixIcon: Icon(Icons.inventory_2_outlined,
+                          color: Color(0xFF94A3B8)),
+                      counterText: '',
+                    ),
+                    maxLength: 30,
+                    textCapitalization: TextCapitalization.words,
+                    validator: AppValidators.required('Please enter a name'),
+                    onSaved: (value) => _name = value!,
+                  ),'''
+  );
+
+  final priceRegex = RegExp(r"const SizedBox\(height: 24\),\s*const InputLabel\(text: 'Selling Price'\),\s*TextFormField\([^;]+=> _price = double\.parse\(value!\),\s*\),");
+  final match = priceRegex.firstMatch(content);
+  if (match != null) {
+      content = content.replaceFirst(priceRegex, '''
+                  const SizedBox(height: 24),
+                  const InputLabel(text: 'Selling Price'),
+                  TextFormField(
+                    keyboardType:
+                        const TextInputType.numberWithOptions(decimal: true),
+                    decoration: const InputDecoration(
+                      hintText: '0.00',
+                      prefixText: '₹ ',
+                      prefixStyle: TextStyle(
+                          fontSize: 16,
+                          fontWeight: FontWeight.bold,
+                          color: Color(0xFF1E293B)),
+                      counterText: '',
+                    ),
+                    maxLength: 8,
+                    inputFormatters: [
+                      FilteringTextInputFormatter.allow(RegExp(r'^\\\\d{0,8}(\\\\.\\\\d{0,2})?')),
+                    ],
+                    validator: AppValidators.price,
+                    onSaved: (value) => _price = double.parse(value!),
+                  ),''');
+  } else {
+    print('Price match not found');
+  }
+
+  file.writeAsStringSync(content);
+}

fix_const.ps1

@@ -0,0 +1,3 @@
+$Code = Get-Content lib/features/product/presentation/pages/product_list_page.dart -Raw
+$Code = $Code -replace 'return const Center\(', 'return Center('
+Set-Content "lib/features/product/presentation/pages/product_list_page.dart" $Code