Support ATTACH_DATA intent on android

This is typically used to set wallpaper or contact photos

app/android/app/src/main/kotlin/com/nkming/nc_photos/ShareChannelHandler.kt

@@ -19,24 +19,35 @@ class ShareChannelHandler(activity: Activity) :
 				try {
 					shareItems(
 						call.argument("fileUris")!!,
-						call.argument("mimeTypes")!!,
+						call.argument("mimeTypes")!!, result
-						result
 					)
 				} catch (e: Throwable) {
 					result.error("systemException", e.toString(), null)
 				}
 			}
+
 			"shareText" -> {
 				try {
 					shareText(
-						call.argument("text")!!,
+						call.argument("text")!!, call.argument("mimeType"),
-						call.argument("mimeType"),
 						result
 					)
 				} catch (e: Throwable) {
 					result.error("systemException", e.toString(), null)
 				}
 			}
+
+			"shareAsAttachData" -> {
+				try {
+					shareAsAttachData(
+						call.argument("fileUri")!!, call.argument("mimeType"),
+						result
+					)
+				} catch (e: Throwable) {
+					result.error("systemException", e.toString(), null)
+				}
+			}
+
 			else -> {
 				result.notImplemented()
 			}
@@ -44,8 +55,7 @@ class ShareChannelHandler(activity: Activity) :
 	}
 
 	private fun shareItems(
-		fileUris: List<String>,
+		fileUris: List<String>, mimeTypes: List<String?>,
-		mimeTypes: List<String?>,
 		result: MethodChannel.Result
 	) {
 		assert(fileUris.isNotEmpty())
@@ -104,6 +114,26 @@ class ShareChannelHandler(activity: Activity) :
 		result.success(null)
 	}
 
+	private fun shareAsAttachData(
+		fileUri: String, mimeType: String?, result: MethodChannel.Result
+	) {
+		val intent = Intent().apply {
+			action = Intent.ACTION_ATTACH_DATA
+			if (mimeType == null) {
+				data = Uri.parse(fileUri)
+			} else {
+				setDataAndType(Uri.parse(fileUri), mimeType)
+			}
+			addCategory(Intent.CATEGORY_DEFAULT)
+			addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+		}
+		val chooser = Intent.createChooser(
+			intent, _context.getString(R.string.attach_data_chooser_title)
+		)
+		_context.startActivity(chooser)
+		result.success(null)
+	}
+
 	private val _activity = activity
 	private val _context get() = _activity
 }

app/lib/entity/local_file/data_source.dart

@@ -53,8 +53,8 @@ class LocalFileMediaStoreDataSource implements LocalFileDataSource {
       onFailure?.call(f, ArgumentError("File not supported"), null);
     });
 
-    final share = AndroidFileShare(uriFiles.map((e) => e.uri).toList(),
+    final share = AndroidFileShare(
-        uriFiles.map((e) => e.mime).toList());
+        uriFiles.map((e) => AndroidFileShareFile(e.uri, e.mime)).toList());
     try {
       await share.share();
     } catch (e, stackTrace) {

app/lib/internal_download_handler.dart

@@ -0,0 +1,124 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:logging/logging.dart';
+import 'package:nc_photos/account.dart';
+import 'package:nc_photos/app_localizations.dart';
+import 'package:nc_photos/entity/file.dart';
+import 'package:nc_photos/entity/file_util.dart' as file_util;
+import 'package:nc_photos/exception_util.dart' as exception_util;
+import 'package:nc_photos/iterable_extension.dart';
+import 'package:nc_photos/k.dart' as k;
+import 'package:nc_photos/map_extension.dart';
+import 'package:nc_photos/snack_bar_manager.dart';
+import 'package:nc_photos/use_case/download_file.dart';
+import 'package:nc_photos/use_case/download_preview.dart';
+import 'package:nc_photos/widget/processing_dialog.dart';
+import 'package:nc_photos_plugin/nc_photos_plugin.dart';
+import 'package:np_codegen/np_codegen.dart';
+
+part 'internal_download_handler.g.dart';
+
+/// Download file to internal dir
+@npLog
+class InternalDownloadHandler {
+  const InternalDownloadHandler(this.account);
+
+  Future<Map<File, dynamic>> downloadPreviews(
+      BuildContext context, List<File> files) async {
+    final controller = StreamController<String>();
+    unawaited(
+      showDialog(
+        context: context,
+        builder: (context) => StreamBuilder(
+          stream: controller.stream,
+          builder: (context, snapshot) => ProcessingDialog(
+            text: L10n.global().shareDownloadingDialogContent +
+                (snapshot.hasData ? " ${snapshot.data}" : ""),
+          ),
+        ),
+      ),
+    );
+    try {
+      final results = <MapEntry<File, dynamic>>[];
+      for (final pair in files.withIndex()) {
+        final i = pair.item1, f = pair.item2;
+        controller.add("($i/${files.length})");
+        try {
+          final dynamic uri;
+          if (file_util.isSupportedImageFormat(f) &&
+              f.contentType != "image/gif") {
+            uri = await DownloadPreview()(account, f);
+          } else {
+            uri = await DownloadFile()(account, f);
+          }
+          results.add(MapEntry(f, uri));
+        } catch (e, stacktrace) {
+          _log.shout(
+              "[downloadPreviews] Failed while DownloadPreview", e, stacktrace);
+          SnackBarManager().showSnackBar(SnackBar(
+            content: Text(exception_util.toUserString(e)),
+            duration: k.snackBarDurationNormal,
+          ));
+        }
+      }
+      return results.toMap();
+    } finally {
+      // dismiss the dialog
+      Navigator.of(context).pop();
+    }
+  }
+
+  Future<Map<File, dynamic>> downloadFiles(
+      BuildContext context, List<File> files) async {
+    final controller = StreamController<String>();
+    unawaited(
+      showDialog(
+        context: context,
+        builder: (context) => StreamBuilder(
+          stream: controller.stream,
+          builder: (context, snapshot) => ProcessingDialog(
+            text: L10n.global().shareDownloadingDialogContent +
+                (snapshot.hasData ? " ${snapshot.data}" : ""),
+          ),
+        ),
+      ),
+    );
+    try {
+      final results = <MapEntry<File, dynamic>>[];
+      for (final pair in files.withIndex()) {
+        final i = pair.item1, f = pair.item2;
+        controller.add("($i/${files.length})");
+        try {
+          results.add(MapEntry(
+              f,
+              await DownloadFile()(
+                account,
+                f,
+                shouldNotify: false,
+              )));
+        } on PermissionException catch (_) {
+          _log.warning("[downloadFiles] Permission not granted");
+          SnackBarManager().showSnackBar(SnackBar(
+            content: Text(L10n.global().errorNoStoragePermission),
+            duration: k.snackBarDurationNormal,
+          ));
+          rethrow;
+        } catch (e, stacktrace) {
+          _log.shout(
+              "[downloadFiles] Failed while downloadFile", e, stacktrace);
+          SnackBarManager().showSnackBar(SnackBar(
+            content: Text(exception_util.toUserString(e)),
+            duration: k.snackBarDurationNormal,
+          ));
+        }
+      }
+      return results.toMap();
+    } finally {
+      // dismiss the dialog
+      Navigator.of(context).pop();
+    }
+  }
+
+  final Account account;
+}

app/lib/internal_download_handler.g.dart

@@ -0,0 +1,15 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'internal_download_handler.dart';
+
+// **************************************************************************
+// NpLogGenerator
+// **************************************************************************
+
+extension _$InternalDownloadHandlerNpLog on InternalDownloadHandler {
+  // ignore: unused_element
+  Logger get _log => log;
+
+  static final log =
+      Logger("internal_download_handler.InternalDownloadHandler");
+}

app/lib/l10n/app_en.arb

@@ -1419,6 +1419,10 @@
 	"removeCollectionsFailedNotification": "Failed to remove some collections",
 	"accountSettingsTooltip": "Account settings",
 	"contributorsTooltip": "Contributors",
+	"setAsTooltip": "Set as",
+	"@setAsTooltip": {
+		"description": "e.g., set as wallpaper"
+	},
 
 	"errorUnauthenticated": "Unauthenticated access. Please sign-in again if the problem continues",
 	"@errorUnauthenticated": {

app/lib/l10n/untranslated-messages.txt

@@ -17,7 +17,8 @@
     "createCollectionDialogNextcloudAlbumDescription",
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "de": [
@@ -106,6 +107,7 @@
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
     "contributorsTooltip",
+    "setAsTooltip",
     "errorAlbumDowngrade"
   ],
 
@@ -216,7 +218,8 @@
     "createCollectionDialogNextcloudAlbumDescription",
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "es": [
@@ -226,7 +229,8 @@
     "settingsSeedColorPickerSystemColorButtonLabel",
     "searchLandingPeopleListEmptyText2",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "fi": [
@@ -236,7 +240,8 @@
     "settingsSeedColorPickerSystemColorButtonLabel",
     "searchLandingPeopleListEmptyText2",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "fr": [
@@ -366,7 +371,8 @@
     "createCollectionDialogNextcloudAlbumDescription",
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "it": [
@@ -671,6 +677,7 @@
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
     "contributorsTooltip",
+    "setAsTooltip",
     "errorUnauthenticated",
     "errorDisconnected",
     "errorLocked",
@@ -1021,6 +1028,7 @@
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
     "contributorsTooltip",
+    "setAsTooltip",
     "errorUnauthenticated",
     "errorDisconnected",
     "errorLocked",
@@ -1172,7 +1180,8 @@
     "createCollectionDialogNextcloudAlbumDescription",
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "pt": [
@@ -1193,7 +1202,8 @@
     "createCollectionDialogNextcloudAlbumDescription",
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "ru": [
@@ -1319,7 +1329,8 @@
     "createCollectionDialogNextcloudAlbumDescription",
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "zh": [
@@ -1445,7 +1456,8 @@
     "createCollectionDialogNextcloudAlbumDescription",
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ],
 
   "zh_Hant": [
@@ -1571,6 +1583,7 @@
     "createCollectionDialogNextcloudAlbumDescription",
     "removeCollectionsFailedNotification",
     "accountSettingsTooltip",
-    "contributorsTooltip"
+    "contributorsTooltip",
+    "setAsTooltip"
   ]
 }

app/lib/mobile/android/share.dart

@@ -8,12 +8,17 @@ class Share {
         "mimeTypes": mimeTypes,
       });
 
-  static Future<void> shareText(
+  static Future<void> shareText(String text, String? mimeType) =>
-          String text, String? mimeType) =>
       _channel.invokeMethod("shareText", <String, dynamic>{
         "text": text,
         "mimeType": mimeType,
       });
 
+  static Future<void> shareAsAttachData(String fileUri, String? mimeType) =>
+      _channel.invokeMethod("shareAsAttachData", <String, dynamic>{
+        "fileUri": fileUri,
+        "mimeType": mimeType,
+      });
+
   static const _channel = MethodChannel("com.nkming.nc_photos/share");
 }

app/lib/mobile/share.dart

@@ -1,16 +1,29 @@
 import 'package:nc_photos/mobile/android/share.dart';
 import 'package:nc_photos/platform/share.dart' as itf;
 
-class AndroidFileShare extends itf.FileShare {
+class AndroidFileShareFile {
-  AndroidFileShare(this.fileUris, this.mimeTypes);
+  const AndroidFileShareFile(this.fileUri, this.mimeType);
+
+  final String fileUri;
+  final String? mimeType;
+}
+
+class AndroidFileShare implements itf.FileShare {
+  const AndroidFileShare(this.files);
 
   @override
-  share() {
+  Future<void> share() {
-    return Share.shareItems(fileUris, mimeTypes);
+    final uris = files.map((e) => e.fileUri).toList();
+    final mimes = files.map((e) => e.mimeType).toList();
+    return Share.shareItems(uris, mimes);
   }
 
-  final List<String> fileUris;
+  Future<void> setAs() {
-  final List<String?> mimeTypes;
+    assert(files.length == 1);
+    return Share.shareAsAttachData(files.first.fileUri, files.first.mimeType);
+  }
+
+  final List<AndroidFileShareFile> files;
 }
 
 class AndroidTextShare extends itf.TextShare {

app/lib/set_as_handler.dart

@@ -0,0 +1,86 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:logging/logging.dart';
+import 'package:nc_photos/account.dart';
+import 'package:nc_photos/di_container.dart';
+import 'package:nc_photos/entity/file.dart';
+import 'package:nc_photos/entity/file_descriptor.dart';
+import 'package:nc_photos/exception_util.dart' as exception_util;
+import 'package:nc_photos/internal_download_handler.dart';
+import 'package:nc_photos/k.dart' as k;
+import 'package:nc_photos/mobile/share.dart';
+import 'package:nc_photos/platform/k.dart' as platform_k;
+import 'package:nc_photos/snack_bar_manager.dart';
+import 'package:nc_photos/use_case/inflate_file_descriptor.dart';
+import 'package:nc_photos/widget/set_as_method_dialog.dart';
+import 'package:np_codegen/np_codegen.dart';
+
+part 'set_as_handler.g.dart';
+
+/// A special way to share image to other apps
+@npLog
+class SetAsHandler {
+  SetAsHandler(
+    this._c, {
+    required this.context,
+    this.clearSelection,
+  });
+
+  Future<void> setAsFile(Account account, FileDescriptor fd) async {
+    try {
+      final file = (await InflateFileDescriptor(_c)(account, [fd])).first;
+      final method = await _askSetAsMethod(file);
+      switch (method) {
+        case SetAsMethod.preview:
+          return await _setAsAsPreview(account, file);
+        case SetAsMethod.file:
+          return await _setAsAsFile(account, file);
+        case null:
+          return;
+      }
+    } catch (e, stackTrace) {
+      _log.shout("[setAsFile] Failed while sharing files", e, stackTrace);
+      SnackBarManager().showSnackBar(SnackBar(
+        content: Text(exception_util.toUserString(e)),
+        duration: k.snackBarDurationNormal,
+      ));
+    } finally {
+      if (!isSelectionCleared) {
+        clearSelection?.call();
+      }
+    }
+  }
+
+  Future<SetAsMethod?> _askSetAsMethod(File file) {
+    return showDialog<SetAsMethod>(
+      context: context,
+      builder: (context) => const SetAsMethodDialog(),
+    );
+  }
+
+  Future<void> _setAsAsPreview(Account account, File file) async {
+    assert(platform_k.isAndroid);
+    final results = await InternalDownloadHandler(account)
+        .downloadPreviews(context, [file]);
+    final share = AndroidFileShare(results.entries
+        .map((e) => AndroidFileShareFile(e.value as String, e.key.contentType))
+        .toList());
+    return share.setAs();
+  }
+
+  Future<void> _setAsAsFile(Account account, File file) async {
+    assert(platform_k.isAndroid);
+    final results =
+        await InternalDownloadHandler(account).downloadFiles(context, [file]);
+    final share = AndroidFileShare(results.entries
+        .map((e) => AndroidFileShareFile(e.value as String, e.key.contentType))
+        .toList());
+    return share.setAs();
+  }
+
+  final DiContainer _c;
+  final BuildContext context;
+  final VoidCallback? clearSelection;
+  var isSelectionCleared = false;
+}

app/lib/set_as_handler.g.dart

@@ -0,0 +1,14 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'set_as_handler.dart';
+
+// **************************************************************************
+// NpLogGenerator
+// **************************************************************************
+
+extension _$SetAsHandlerNpLog on SetAsHandler {
+  // ignore: unused_element
+  Logger get _log => log;
+
+  static final log = Logger("set_as_handler.SetAsHandler");
+}

app/lib/share_handler.dart

@@ -17,7 +17,7 @@ import 'package:nc_photos/entity/local_file.dart';
 import 'package:nc_photos/entity/share.dart';
 import 'package:nc_photos/entity/share/data_source.dart';
 import 'package:nc_photos/exception_util.dart' as exception_util;
-import 'package:nc_photos/iterable_extension.dart';
+import 'package:nc_photos/internal_download_handler.dart';
 import 'package:nc_photos/k.dart' as k;
 import 'package:nc_photos/mobile/share.dart';
 import 'package:nc_photos/platform/k.dart' as platform_k;
@@ -26,17 +26,12 @@ import 'package:nc_photos/snack_bar_manager.dart';
 import 'package:nc_photos/use_case/copy.dart';
 import 'package:nc_photos/use_case/create_dir.dart';
 import 'package:nc_photos/use_case/create_share.dart';
-import 'package:nc_photos/use_case/download_file.dart';
-import 'package:nc_photos/use_case/download_preview.dart';
 import 'package:nc_photos/use_case/inflate_file_descriptor.dart';
 import 'package:nc_photos/use_case/share_local.dart';
-import 'package:nc_photos/widget/processing_dialog.dart';
 import 'package:nc_photos/widget/share_link_multiple_files_dialog.dart';
 import 'package:nc_photos/widget/share_method_dialog.dart';
 import 'package:nc_photos/widget/simple_input_dialog.dart';
-import 'package:nc_photos_plugin/nc_photos_plugin.dart';
 import 'package:np_codegen/np_codegen.dart';
-import 'package:tuple/tuple.dart';
 
 part 'share_handler.g.dart';
 
@@ -118,100 +113,21 @@ class ShareHandler {
 
   Future<void> _shareAsPreview(Account account, List<File> files) async {
     assert(platform_k.isAndroid);
-    final controller = StreamController<String>();
+    final results =
-    unawaited(
+        await InternalDownloadHandler(account).downloadPreviews(context, files);
-      showDialog(
+    final share = AndroidFileShare(results.entries
-        context: context,
+        .map((e) => AndroidFileShareFile(e.value as String, e.key.contentType))
-        builder: (context) => StreamBuilder(
+        .toList());
-          stream: controller.stream,
-          builder: (context, snapshot) => ProcessingDialog(
-            text: L10n.global().shareDownloadingDialogContent +
-                (snapshot.hasData ? " ${snapshot.data}" : ""),
-          ),
-        ),
-      ),
-    );
-    final results = <Tuple2<File, dynamic>>[];
-    for (final pair in files.withIndex()) {
-      final i = pair.item1, f = pair.item2;
-      controller.add("($i/${files.length})");
-      try {
-        final dynamic uri;
-        if (file_util.isSupportedImageFormat(f) &&
-            f.contentType != "image/gif") {
-          uri = await DownloadPreview()(account, f);
-        } else {
-          uri = await DownloadFile()(account, f);
-        }
-        results.add(Tuple2(f, uri));
-      } catch (e, stacktrace) {
-        _log.shout(
-            "[_shareAsPreview] Failed while DownloadPreview", e, stacktrace);
-        SnackBarManager().showSnackBar(SnackBar(
-          content: Text(exception_util.toUserString(e)),
-          duration: k.snackBarDurationNormal,
-        ));
-      }
-    }
-    // dismiss the dialog
-    Navigator.of(context).pop();
-
-    final share = AndroidFileShare(
-        results.map((e) => e.item2 as String).toList(),
-        results.map((e) => e.item1.contentType).toList());
     return share.share();
   }
 
   Future<void> _shareAsFile(Account account, List<File> files) async {
     assert(platform_k.isAndroid);
-    final controller = StreamController<String>();
+    final results =
-    unawaited(
+        await InternalDownloadHandler(account).downloadFiles(context, files);
-      showDialog(
+    final share = AndroidFileShare(results.entries
-        context: context,
+        .map((e) => AndroidFileShareFile(e.value as String, e.key.contentType))
-        builder: (context) => StreamBuilder(
+        .toList());
-          stream: controller.stream,
-          builder: (context, snapshot) => ProcessingDialog(
-            text: L10n.global().shareDownloadingDialogContent +
-                (snapshot.hasData ? " ${snapshot.data}" : ""),
-          ),
-        ),
-      ),
-    );
-    final results = <Tuple2<File, dynamic>>[];
-    for (final pair in files.withIndex()) {
-      final i = pair.item1, f = pair.item2;
-      controller.add("($i/${files.length})");
-      try {
-        results.add(Tuple2(
-            f,
-            await DownloadFile()(
-              account,
-              f,
-              shouldNotify: false,
-            )));
-      } on PermissionException catch (_) {
-        _log.warning("[_shareAsFile] Permission not granted");
-        SnackBarManager().showSnackBar(SnackBar(
-          content: Text(L10n.global().errorNoStoragePermission),
-          duration: k.snackBarDurationNormal,
-        ));
-        // dismiss the dialog
-        Navigator.of(context).pop();
-        rethrow;
-      } catch (e, stacktrace) {
-        _log.shout("[_shareAsFile] Failed while downloadFile", e, stacktrace);
-        SnackBarManager().showSnackBar(SnackBar(
-          content: Text(exception_util.toUserString(e)),
-          duration: k.snackBarDurationNormal,
-        ));
-      }
-    }
-    // dismiss the dialog
-    Navigator.of(context).pop();
-
-    final share = AndroidFileShare(
-        results.map((e) => e.item2 as String).toList(),
-        results.map((e) => e.item1.contentType).toList());
     return share.share();
   }
 

app/lib/widget/file_sharer_dialog/bloc.dart

@@ -94,10 +94,9 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
       }
     }
     if (results.isNotEmpty) {
-      final share = AndroidFileShare(
+      final share = AndroidFileShare(results
-        results.map((e) => e.item2 as String).toList(),
+          .map((e) => AndroidFileShareFile(e.item2 as String, e.item1.fdMime))
-        results.map((e) => e.item1.fdMime).toList(),
+          .toList());
-      );
       unawaited(share.share());
     }
     emit(state.copyWith(result: true));
@@ -129,10 +128,9 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
       }
     }
     if (results.isNotEmpty) {
-      final share = AndroidFileShare(
+      final share = AndroidFileShare(results
-        results.map((e) => e.item2 as String).toList(),
+          .map((e) => AndroidFileShareFile(e.item2 as String, e.item1.fdMime))
-        results.map((e) => e.item1.fdMime).toList(),
+          .toList());
-      );
       unawaited(share.share());
     }
     emit(state.copyWith(result: true));

app/lib/widget/set_as_method_dialog.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+import 'package:nc_photos/app_localizations.dart';
+
+enum SetAsMethod {
+  file,
+  preview,
+}
+
+class SetAsMethodDialog extends StatelessWidget {
+  const SetAsMethodDialog({
+    super.key,
+    this.isSupportPerview = true,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return SimpleDialog(
+      title: Text(L10n.global().setAsTooltip),
+      children: [
+        if (isSupportPerview)
+          SimpleDialogOption(
+            child: ListTile(
+              title: Text(L10n.global().shareMethodPreviewTitle),
+              subtitle: Text(L10n.global().shareMethodPreviewDescription),
+            ),
+            onPressed: () {
+              Navigator.of(context).pop(SetAsMethod.preview);
+            },
+          ),
+        SimpleDialogOption(
+          child: ListTile(
+            title: Text(L10n.global().shareMethodOriginalFileTitle),
+            subtitle: Text(L10n.global().shareMethodOriginalFileDescription),
+          ),
+          onPressed: () {
+            Navigator.of(context).pop(SetAsMethod.file);
+          },
+        ),
+      ],
+    );
+  }
+
+  final bool isSupportPerview;
+}

app/lib/widget/viewer_detail_pane.dart

@@ -18,12 +18,14 @@ import 'package:nc_photos/entity/collection_item.dart';
 import 'package:nc_photos/entity/exif_extension.dart';
 import 'package:nc_photos/entity/file.dart';
 import 'package:nc_photos/entity/file_descriptor.dart';
+import 'package:nc_photos/entity/file_util.dart' as file_util;
 import 'package:nc_photos/k.dart' as k;
 import 'package:nc_photos/location_util.dart' as location_util;
 import 'package:nc_photos/object_extension.dart';
 import 'package:nc_photos/or_null.dart';
 import 'package:nc_photos/platform/features.dart' as features;
 import 'package:nc_photos/platform/k.dart' as platform_k;
+import 'package:nc_photos/set_as_handler.dart';
 import 'package:nc_photos/snack_bar_manager.dart';
 import 'package:nc_photos/theme.dart';
 import 'package:nc_photos/use_case/inflate_file_descriptor.dart';
@@ -169,6 +171,13 @@ class _ViewerDetailPaneState extends State<ViewerDetailPane> {
                     label: L10n.global().addItemToCollectionTooltip,
                     onPressed: () => _onAddToAlbumPressed(context),
                   ),
+                  if (platform_k.isAndroid &&
+                      file_util.isSupportedImageFormat(_file!))
+                    _DetailPaneButton(
+                      icon: Icons.launch,
+                      label: L10n.global().setAsTooltip,
+                      onPressed: () => _onSetAsPressed(context),
+                    ),
                   if (widget.fd.fdIsArchived == true)
                     _DetailPaneButton(
                       icon: Icons.unarchive_outlined,
@@ -417,6 +426,12 @@ class _ViewerDetailPaneState extends State<ViewerDetailPane> {
     );
   }
 
+  void _onSetAsPressed(BuildContext context) {
+    assert(_file != null);
+    final c = KiwiContainer().resolve<DiContainer>();
+    SetAsHandler(c, context: context).setAsFile(widget.account, _file!);
+  }
+
   void _onMapTap() {
     if (platform_k.isAndroid) {
       final intent = AndroidIntent(

plugin/android/src/main/res/values/strings.xml

@@ -11,4 +11,5 @@
 	<string name="download_progress_notification_untitled_text">Downloading</string>
 	<string name="log_save_successful_notification_title">Logs saved successfully</string>
 	<string name="log_save_successful_notification_text">Tap to view your saved logs</string>
+	<string name="attach_data_chooser_title">Set as</string>
 </resources>