Show an icon if the gallery is downloaded

app/src/main/java/com/hippo/ehviewer/EhApplication.java

@@ -356,6 +356,11 @@ public class EhApplication extends RecordingApplication {
         return application.mSpiderInfoCache;
     }
 
+    @NonNull
+    public static DownloadManager getDownloadManager() {
+        return getDownloadManager(instance);
+    }
+
     @NonNull
     public static DownloadManager getDownloadManager(@NonNull Context context) {
         EhApplication application = ((EhApplication) context.getApplicationContext());