Lets try this

Author: DevUt

android/app/build.gradle

@@ -1,3 +1,9 @@
+plugins {
+    id "com.android.application"
+    id "kotlin-android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
 def localProperties = new Properties()
 def localPropertiesFile = rootProject.file('local.properties')
 if (localPropertiesFile.exists()) {
@@ -6,10 +12,6 @@ if (localPropertiesFile.exists()) {
     }
 }
 
-def flutterRoot = localProperties.getProperty('flutter.sdk')
-if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
-}
 
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
 if (flutterVersionCode == null) {
@@ -21,9 +23,6 @@ if (flutterVersionName == null) {
     flutterVersionName = '1.0'
 }
 
-apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android'
-apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 def keystoreProperties = new Properties()
 def keystorePropertiesFile = rootProject.file('key.properties')
@@ -32,17 +31,18 @@ if (keystorePropertiesFile.exists()) {
 }
 
 android {
-    compileSdkVersion 33
+    compileSdkVersion 34
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
     }
 
+    namespace 'com.trisven.safenotes'
     defaultConfig {
 
         applicationId "com.trisven.safenotes"
         minSdkVersion 25
-        targetSdkVersion 33
+        targetSdkVersion 34
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }
@@ -69,13 +69,19 @@ android {
        }
    }
 
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget=17
+    }
+
 }
 
 flutter {
     source '../..'
 }
 
-dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-}
 //android.buildTypes.release.ndk.debugSymbolLevel = 'FULL'

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.trisven.safenotes">
+   >
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <application
         android:label="Safe Notes"

android/build.gradle

@@ -1,29 +1,29 @@
-buildscript {
-    ext.kotlin_version = '1.6.0'
+allprojects {
     repositories {
         google()
         jcenter()
     }
-
-    dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.0'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-    }
 }
 
-allprojects {
-    repositories {
-        google()
-        jcenter()
+subprojects {
+    afterEvaluate { project ->
+        if (project.hasProperty('android')) {
+            project.android {
+                if (namespace == null) {
+                    namespace project.group
+                }
+            }
+        }
     }
 }
 
 rootProject.buildDir = '../build'
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
     project.evaluationDependsOn(':app')
+
 }
 
-task clean(type: Delete) {
+tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }

android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Jun 23 08:50:38 CEST 2017
+#Sat Nov 30 00:02:22 IST 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

android/settings.gradle

@@ -1,11 +1,25 @@
-include ':app'
+pluginManagement {
+    def flutterSdkPath = {
+        def properties = new Properties()
+        file("local.properties").withInputStream { properties.load(it) }
+        def flutterSdkPath = properties.getProperty("flutter.sdk")
+        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+        return flutterSdkPath
+    }()
 
-def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
-def properties = new Properties()
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
 
-assert localPropertiesFile.exists()
-localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
 
-def flutterSdkPath = properties.getProperty("flutter.sdk")
-assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
-apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+    id "com.android.application" version "8.5.0" apply false
+    id "org.jetbrains.kotlin.android" version "1.9.0" apply false
+}
+
+include ":app"

lib/model/app_theme.dart

@@ -29,7 +29,7 @@ class AppThemes {
         FloatingActionButtonThemeData(backgroundColor: Colors.grey),
     colorScheme: ColorScheme.dark(primary: Colors.blue)
         .copyWith(
-            primaryContainer: Colors.grey, background: const Color(0xFF212121))
+            primaryContainer: Colors.grey, surface: const Color(0xFF212121))
         .copyWith(secondary: Colors.white),
   );
 
@@ -44,7 +44,7 @@ class AppThemes {
     ),
     colorScheme: ColorScheme.light(primary: const Color(0xff303F9F))
         .copyWith(
-            primaryContainer: Colors.grey, background: const Color(0xFFE5E5E5))
+            primaryContainer: Colors.grey, surface: const Color(0xFFE5E5E5))
         .copyWith(secondary: Colors.black),
   );
 }

lib/page/edit_safe_note_page.dart

@@ -44,7 +44,7 @@ class _AddEditNotePageState extends State<AddEditNotePage>
   @override
   void initState() {
     super.initState();
-    WidgetsBinding.instance?.addObserver(this);
+    WidgetsBinding.instance.addObserver(this);
     title = widget.note?.title ?? '';
     title = emptyTitle(title);
     description = widget.note?.description ?? '';
@@ -53,7 +53,7 @@ class _AddEditNotePageState extends State<AddEditNotePage>
 
   @override
   void dispose() {
-    WidgetsBinding.instance?.removeObserver(this);
+    WidgetsBinding.instance.removeObserver(this);
     super.dispose();
   }
 

lib/page/safe_notes_page.dart

@@ -575,7 +575,7 @@ class _NotesPageState extends State<NotesPage> {
                           child: Text('Unencrypted (Unsecure)'),
                           style: ButtonStyle(
                               //Highlight dangers of insecure export
-                              backgroundColor: MaterialStateProperty.all<Color>(
+                              backgroundColor: WidgetStateProperty.all<Color>(
                                   Colors.redAccent.shade700)),
                           onPressed: () {
                             ExportEncryptionControl.setIsExportEncrypted(false);