hack it

lib/studies/reply/mail_card_preview.dart

@@ -1,4 +1,5 @@
 import 'package:animations/animations.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:gallery/layout/adaptive.dart';
 import 'package:gallery/studies/reply/colors.dart';
@@ -252,6 +253,16 @@ class _MailPreview extends StatelessWidget {
  }
 }
 
+bool _shouldShrinkImage() {
+ switch (defaultTargetPlatform) {
+ case TargetPlatform.iOS:
+ case TargetPlatform.android:
+ return true;
+ default:
+ return false;
+ }
+}
+
 class _PicturePreview extends StatelessWidget {
  const _PicturePreview();
 
@@ -269,7 +280,7 @@ class _PicturePreview extends StatelessWidget {
  'reply/attachments/paris_${index + 1}.jpg',
  gaplessPlayback: true,
  package: 'flutter_gallery_assets',
- cacheWidth: 200,
+ cacheWidth: _shouldShrinkImage() ? 200 : null,
  ),
  );
  },

lib/studies/reply/mail_view_page.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:gallery/studies/reply/model/email_model.dart';
 import 'package:gallery/studies/reply/model/email_store.dart';
@@ -131,6 +132,16 @@ class _MailViewBody extends StatelessWidget {
  }
 }
 
+bool _shouldShrinkImage() {
+ switch (defaultTargetPlatform) {
+ case TargetPlatform.iOS:
+ case TargetPlatform.android:
+ return true;
+ default:
+ return false;
+ }
+}
+
 class _PictureGrid extends StatelessWidget {
  const _PictureGrid();
 
@@ -151,7 +162,7 @@ class _PictureGrid extends StatelessWidget {
  gaplessPlayback: true,
  package: 'flutter_gallery_assets',
  fit: BoxFit.fill,
- cacheWidth: 500,
+ cacheWidth: _shouldShrinkImage() ? 500 : null,
  );
  },
  );

lib/studies/shrine/app.dart

@@ -151,6 +151,7 @@ class _ShrineAppState extends State<ShrineApp>
 
  return ScopedModel<AppStateModel>(
  model: _model.value,
+ // ignore: deprecated_member_use
  child: WillPopScope(
  onWillPop: _onWillPop,
  child: MaterialApp(