fix java version mismatch and compatibility

.gitignore

@@ -29,4 +29,7 @@ doc/api/
 
 #Custom files to ignore
 secrets/upload-keystore.jks
-secrets/keystore.properties
+secrets/keystore.properties
+
+#VSCode
+.vscode/

filc/android/app/build.gradle

@@ -1,8 +1,8 @@
 plugins {
-    id "com.android.application"
-    id "kotlin-android"
+    id 'com.android.application'
+    id 'kotlin-android'
     // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
-    id "dev.flutter.flutter-gradle-plugin"
+    id 'dev.flutter.flutter-gradle-plugin'
 }
 
 // Load keystore properties from the independent secrets folder
@@ -21,22 +21,22 @@ println "Keystore properties file exists: ${keystorePropertiesFile.exists()}"
 println "Keystore file path: ${keystoreProperties['storeFile']}"
 
 android {
-    namespace = "hu.qwit.filc"
+    namespace = 'hu.qwit.filc'
     compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_1_8
+        jvmTarget = JavaVersion.VERSION_17
     }
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId = "hu.qwit.filc"
+        applicationId = 'hu.qwit.filc'
         // 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
@@ -62,5 +62,5 @@ android {
 }
 
 flutter {
-    source = "../.."
-}
+    source = '../..'
+}

filc/android/settings.gradle

@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "8.1.0" apply false
+    id "com.android.application" version "8.2.1" apply false
     id "org.jetbrains.kotlin.android" version "1.8.22" apply false
 }