near final

lib/audio_cache.dart

@@ -13,8 +13,15 @@ class AudioCache {
     return _audioCache.keys.toList();
   }
 
-  Uint8List operator [](String key) {
-    return _audioCache[key]!;
+  Uint8List? operator [](String key) {
+    // ignore case
+    key = key.toLowerCase();
+    for (var k in _audioCache.keys) {
+      if (k.toLowerCase() == key) {
+        return _audioCache[k];
+      }
+    }
+    return null;
   }
 }
 
@@ -22,7 +29,21 @@ class AnnouncementCache extends AudioCache {
 
   String _assetLocation = "assets/ibus_recordings.zip";
 
-  Future<void> loadAnnouncements(List<String> Announcements) async {
+  Future<void> loadAnnouncements(List<String> announcements) async {
+
+    List<String> _announements = [];
+
+
+    // remove any announcements that are already loaded
+    for (var announcement in announcements) {
+      if (!_audioCache.containsKey(announcement.toLowerCase())) {
+        _announements.add(announcement);
+      }
+    }
+
+    if (_announements.length == 0) {
+      return;
+    }
 
     final bytes = await rootBundle.load(_assetLocation);
     final archive = ZipDecoder().decodeBytes(bytes.buffer.asUint8List());
@@ -34,9 +55,9 @@ class AnnouncementCache extends AudioCache {
         filename = filename.split("/").last;
       }
 
-      if (Announcements.contains(filename)) {
-        _audioCache[filename] = file.content;
-        print("Loaded announcement: ${filename}");
+      if (_announements.contains(filename)) {
+        _audioCache[filename.toLowerCase()] = file.content;
+        print("Loaded announcement: $filename");
       }
     }
   }
@@ -62,7 +83,7 @@ class AnnouncementCache extends AudioCache {
         filename = filename.split("/").last;
       }
 
-      _audioCache[filename] = file.content;
+      _audioCache[filename.toLowerCase()] = file.content;
     }
 
     print("Done loading all announcements.");