Update flutter

lib/service/tangocard_files.dart

@@ -1,8 +1,9 @@
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:tangocard_reader/models/data_entry.dart';
+import 'package:yokutango_mobile_reader/models/data_entry.dart';
 
 // TODO: merge
 
@@ -28,16 +29,28 @@ Future<Map<File, List<YokutangoEntry>>> get tangocardFilePaths => rootBundle
       ),
     );
 
-Future<Map<File, List<KanjiEntry>>> get kanjicardFilePaths => rootBundle
-    .loadString('AssetManifest.json')
-    .then(
-      (json) => jsonDecode(json)
-          .keys
-          .where((String key) =>
-              key.contains(RegExp(r'yokutango/kanji/kanji_\d+.json')))
-          .toList(),
-    )
-    .then(
+Future<Map<File, List<KanjiEntry>>> get kanjicardFilePaths =>
+    rootBundle.loadString('AssetManifest.json').then(
+      (json) {
+        final jsonKeys = jsonDecode(json).keys;
+
+        final kanjiPaths = jsonKeys
+            .where((String key) =>
+                RegExp(r'assets/yokutango/kanji/kanji_\d+.json')
+                    .matchAsPrefix(key) !=
+                null)
+            .toList();
+
+        final kanaPaths = jsonKeys
+            .where((String key) =>
+                RegExp(r'assets/yokutango/kanji/(?:hiragana|katakana).json')
+                    .matchAsPrefix(key) !=
+                null)
+            .toList();
+
+        return kanaPaths + kanjiPaths;
+      },
+    ).then(
       (l) async => Map.fromIterables(
         l.map<File>((f) => File(f)),
         await Future.wait<List<KanjiEntry>>(l.map<Future<List<KanjiEntry>>>(