Fehlerkorrekturen und Erweiterungen

lib/tools/util.dart

@@ -16,19 +16,22 @@ import 'package:uuid/uuid.dart';
 import '../Tools/colored_safe_area.dart';
 
 class Util {
-  static Future<bool> preferencesContainsKey(String key) async {
-    var prefs = await SharedPreferences.getInstance();
+  static late SharedPreferences prefs;
+
+  static init() async {
+    prefs = await SharedPreferences.getInstance();
+  }
+
+  static bool preferencesContainsKey(String key) {
     return prefs.containsKey(key);
   }
 
   static void preferencesSaveString(String key, String value) async {
-    var prefs = await SharedPreferences.getInstance();
     await prefs.setString(key, value);
   }
 
-  static Future<String?> preferencesGetString(String key, String? defaultValue) async {
-    if (await preferencesContainsKey(key)) {
-      var prefs = await SharedPreferences.getInstance();
+  static String? preferencesGetString(String key, String? defaultValue) {
+    if (preferencesContainsKey(key)) {
       return prefs.getString(key);
     }
 
@@ -36,13 +39,11 @@ class Util {
   }
 
   static void preferencesSaveInt(String key, int value) async {
-    var prefs = await SharedPreferences.getInstance();
     await prefs.setInt(key, value);
   }
 
-  static Future<int?> preferencesGetInt(String key, int? defaultValue) async {
-    if (await preferencesContainsKey(key)) {
-      var prefs = await SharedPreferences.getInstance();
+  static int? preferencesGetInt(String key, int? defaultValue) {
+    if (preferencesContainsKey(key)) {
       return prefs.getInt(key);
     }
 
@@ -50,21 +51,19 @@ class Util {
   }
 
   static void preferencesSaveBool(String key, bool value) async {
-    var prefs = await SharedPreferences.getInstance();
     await prefs.setBool(key, value);
   }
 
-  static Future<bool> preferencesGetBool(String key, bool defaultValue) async {
-    if (await preferencesContainsKey(key)) {
-      var prefs = await SharedPreferences.getInstance();
+  static bool preferencesGetBool(String key, bool defaultValue) {
+    if (preferencesContainsKey(key)) {
       return prefs.getBool(key) as bool;
     }
 
     return defaultValue;
   }
 
-  static Future<String> getAppUuid() async {
-    var currentUuid = await preferencesGetString('uuid', null);
+  static String getAppUuid() {
+    var currentUuid = preferencesGetString('uuid', null);
 
     if (currentUuid == null) {
       currentUuid ??= const Uuid().v4();