first commit

lib/models/locale_adapter.dart

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+import 'package:flutter/material.dart';
+import 'package:hive/hive.dart';
+
+class LocaleAdapter extends TypeAdapter<Locale> {
+  @override
+  int get typeId => 42;
+
+  @override
+  Locale read(BinaryReader reader) {
+    final localeList = reader.readStringList();
+
+    final languageCode = localeList[0];
+
+    // scriptCode and countryCode are empty strings when null (see write)
+    final scriptCode = localeList[1] == "" ? null : localeList[1];
+    final countryCode = localeList[2] == "" ? null : localeList[2];
+
+    return Locale.fromSubtags(
+      languageCode: languageCode,
+      scriptCode: scriptCode,
+      countryCode: countryCode,
+    );
+  }
+
+  @override
+  void write(BinaryWriter writer, Locale obj) {
+    writer.writeStringList([
+      obj.languageCode,
+      obj.scriptCode ?? "",
+      obj.countryCode ?? "",
+    ]);
+  }
+}