fix(mobile): download asset to Camera folder on Android (#12355)

* fix(mobile): download asset to Camera folder on Android

* remove unused import

* better message

* linting

mobile/assets/i18n/en-US.json

@@ -252,9 +252,10 @@
   "home_page_share_err_local": "Can not share local assets via link, skipping",
   "home_page_upload_err_limit": "Can only upload a maximum of 30 assets at a time, skipping",
   "image_saved_successfully": "Image saved",
-  "image_viewer_page_state_provider_download_error": "Download Error",
-  "image_viewer_page_state_provider_download_started": "Download Started",
-  "image_viewer_page_state_provider_download_success": "Download Success",
+  "download_error": "Download Error",
+  "download_started": "Download started",
+  "download_sucess": "Download success",
+  "download_sucess_android": "The media has been downloaded to DCIM/Immich",
   "image_viewer_page_state_provider_share_error": "Share Error",
   "invalid_date": "Invalid date",
   "invalid_date_format": "Invalid date format",

mobile/lib/providers/asset_viewer/image_viewer_page_state.provider.dart

@@ -1,3 +1,5 @@
+import 'dart:io';
+
 import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:fluttertoast/fluttertoast.dart';
@@ -31,19 +33,21 @@ class ImageViewerStateNotifier extends StateNotifier<AssetViewerPageState> {
 
     ImmichToast.show(
       context: context,
-      msg: 'image_viewer_page_state_provider_download_started'.tr(),
+      msg: 'download_started'.tr(),
       toastType: ToastType.info,
       gravity: ToastGravity.BOTTOM,
     );
 
-    bool isSuccess = await _imageViewerService.downloadAssetToDevice(asset);
+    bool isSuccess = await _imageViewerService.downloadAsset(asset);
 
     if (isSuccess) {
       state = state.copyWith(downloadAssetStatus: DownloadAssetStatus.success);
 
       ImmichToast.show(
         context: context,
-        msg: 'image_viewer_page_state_provider_download_success'.tr(),
+        msg: Platform.isAndroid
+            ? 'download_sucess_android'.tr()
+            : 'download_sucess'.tr(),
         toastType: ToastType.success,
         gravity: ToastGravity.BOTTOM,
       );
@@ -52,7 +56,7 @@ class ImageViewerStateNotifier extends StateNotifier<AssetViewerPageState> {
       state = state.copyWith(downloadAssetStatus: DownloadAssetStatus.error);
       ImmichToast.show(
         context: context,
-        msg: 'image_viewer_page_state_provider_download_error'.tr(),
+        msg: 'download_error'.tr(),
         toastType: ToastType.error,
         gravity: ToastGravity.BOTTOM,
       );

mobile/lib/services/image_viewer.service.dart

@@ -19,7 +19,7 @@ class ImageViewerService {
 
   ImageViewerService(this._apiService);
 
-  Future<bool> downloadAssetToDevice(Asset asset) async {
+  Future<bool> downloadAsset(Asset asset) async {
     File? imageFile;
     File? videoFile;
     try {
@@ -82,18 +82,23 @@ class ImageViewerService {
         }
 
         final AssetEntity? entity;
+        final relativePath = Platform.isAndroid ? 'DCIM/Immich' : null;
 
         if (asset.isImage) {
           entity = await PhotoManager.editor.saveImage(
             res.bodyBytes,
             title: asset.fileName,
+            relativePath: relativePath,
           );
         } else {
           final tempDir = await getTemporaryDirectory();
           videoFile = await File('${tempDir.path}/${asset.fileName}').create();
           videoFile.writeAsBytesSync(res.bodyBytes);
-          entity = await PhotoManager.editor
-              .saveVideo(videoFile, title: asset.fileName);
+          entity = await PhotoManager.editor.saveVideo(
+            videoFile,
+            title: asset.fileName,
+            relativePath: relativePath,
+          );
         }
         return entity != null;
       }

mobile/lib/widgets/asset_viewer/gallery_app_bar.dart

@@ -93,6 +93,10 @@ class GalleryAppBar extends ConsumerWidget {
       );
     }
 
+    handleDownloadAsset() {
+      ref.read(imageViewerStateProvider.notifier).downloadAsset(asset, context);
+    }
+
     return IgnorePointer(
       ignoring: !ref.watch(showControlsProvider),
       child: AnimatedOpacity(
@@ -109,13 +113,7 @@ class GalleryAppBar extends ConsumerWidget {
             onFavorite: toggleFavorite,
             onRestorePressed: () => handleRestore(asset),
             onUploadPressed: asset.isLocal ? () => handleUpload(asset) : null,
-            onDownloadPressed: asset.isLocal
-                ? null
-                : () =>
-                    ref.read(imageViewerStateProvider.notifier).downloadAsset(
-                          asset,
-                          context,
-                        ),
+            onDownloadPressed: asset.isLocal ? null : handleDownloadAsset,
             onToggleMotionVideo: onToggleMotionVideo,
             onAddToAlbumPressed: () => addToAlbum(asset),
             onActivitiesPressed: handleActivities,