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lib/controller/local/local_controller.dart

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+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+
+import '../../constant/box_name.dart';
+import '../../main.dart';
+import '../themes/themes.dart';
+
+class LocaleController extends GetxController {
+  Locale? language;
+
+  ThemeData appTheme = themeEnglish;
+
+  changeLang(String langcode) {
+    Locale locale = Locale(langcode);
+    box.write(BoxName.lang, langcode);
+    appTheme = langcode == "ar" ? themeArabic : themeEnglish;
+    Get.changeTheme(appTheme);
+    Get.updateLocale(locale);
+    update();
+  }
+
+  @override
+  void onInit() {
+    if (box.read(BoxName.lang) == "ar") {
+      language = const Locale("ar");
+      appTheme = themeArabic;
+    } else if (box.read(BoxName.lang) == "en") {
+      language = const Locale("en");
+      appTheme = themeEnglish;
+    } else {
+      language = Locale(Get.deviceLocale!.languageCode);
+      appTheme = themeEnglish;
+    }
+    super.onInit();
+  }
+}

lib/controller/local/translations.dart

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+import 'package:get/get.dart';
+
+class MyTranslation extends Translations {
+  @override
+  Map<String, Map<String, String>> get keys => {
+        "ar": {
+          "Choose Language": "اختر اللغة",
+        },
+        "en": {
+          "Choose Language": "Choose Language",
+        },
+        "tr": {
+          "Choose Language": "Dil seç",
+        },
+      };
+}