fix android SAF SWB

Author: julian-CStack

lib/pages/settings_views/global_settings_view/stack_backup_views/auto_backup_view.dart

@@ -101,8 +101,9 @@ class _AutoBackupViewState extends ConsumerState<AutoBackupView> {
             child: Text(
               "Back",
               style: STextStyles.button(context).copyWith(
-                color:
-                    Theme.of(context).extension<StackColors>()!.accentColorDark,
+                color: Theme.of(
+                  context,
+                ).extension<StackColors>()!.accentColorDark,
               ),
             ),
             onPressed: () {
@@ -155,8 +156,9 @@ class _AutoBackupViewState extends ConsumerState<AutoBackupView> {
             child: Text(
               "Back",
               style: STextStyles.button(context).copyWith(
-                color:
-                    Theme.of(context).extension<StackColors>()!.accentColorDark,
+                color: Theme.of(
+                  context,
+                ).extension<StackColors>()!.accentColorDark,
               ),
             ),
             onPressed: () {
@@ -313,14 +315,13 @@ class _AutoBackupViewState extends ConsumerState<AutoBackupView> {
                           TextSpan(
                             text: "stackwallet.com.",
                             style: STextStyles.richLink(context),
-                            recognizer:
-                                TapGestureRecognizer()
-                                  ..onTap = () {
-                                    launchUrl(
-                                      Uri.parse("https://stackwallet.com"),
-                                      mode: LaunchMode.externalApplication,
-                                    );
-                                  },
+                            recognizer: TapGestureRecognizer()
+                              ..onTap = () {
+                                launchUrl(
+                                  Uri.parse("https://stackwallet.com"),
+                                  mode: LaunchMode.externalApplication,
+                                );
+                              },
                           ),
                         ],
                       ),

lib/pages/settings_views/global_settings_view/stack_backup_views/create_auto_backup_view.dart

@@ -261,7 +261,7 @@ class _EnableAutoBackupViewState extends ConsumerState<CreateAutoBackupView> {
                                         await stackFileSystem.prepareStorage();
                                         if (mounted) {
                                           final filePath = await stackFileSystem
-                                              .openFile();
+                                              .pickDir();
 
                                           if (mounted) {
                                             setState(() {

lib/pages/settings_views/global_settings_view/stack_backup_views/create_backup_view.dart

@@ -310,7 +310,7 @@ class _RestoreFromFileViewState extends ConsumerState<CreateBackupView> {
                                 await stackFileSystem.prepareStorage();
                                 if (mounted) {
                                   final filePath = await stackFileSystem
-                                      .openFile();
+                                      .pickDir();
 
                                   if (mounted) {
                                     setState(() {

lib/pages/settings_views/global_settings_view/stack_backup_views/edit_auto_backup_view.dart

@@ -302,7 +302,7 @@ class _EditAutoBackupViewState extends ConsumerState<EditAutoBackupView> {
                       try {
                         await stackFileSystem.prepareStorage();
                         if (mounted) {
-                          final filePath = await stackFileSystem.openFile();
+                          final filePath = await stackFileSystem.pickDir();
 
                           if (mounted) {
                             setState(() {

lib/pages_desktop_specific/settings/settings_menu/backup_and_restore/create_auto_backup.dart

@@ -321,7 +321,7 @@ class _CreateAutoBackup extends ConsumerState<CreateAutoBackup> {
                                     await stackFileSystem.prepareStorage();
                                     if (mounted) {
                                       final filePath = await stackFileSystem
-                                          .openFile();
+                                          .pickDir();
 
                                       if (mounted) {
                                         setState(() {

lib/services/auto_swb_service.dart

@@ -17,6 +17,7 @@ import 'package:tuple/tuple.dart';
 
 import '../pages/settings_views/global_settings_view/stack_backup_views/helpers/restore_create_backup.dart';
 import '../utilities/flutter_secure_storage_interface.dart';
+import '../utilities/fs.dart';
 import '../utilities/logger.dart';
 import '../utilities/prefs.dart';
 
@@ -91,7 +92,11 @@ class AutoSWBService extends ChangeNotifier {
         adkVersion,
       );
 
-      await File(fileToSave).writeAsString(content, flush: true);
+      await FS.writeStringToFile(
+        content,
+        autoBackupDirectoryPath,
+        fileToSave.split("/").last,
+      );
 
       Prefs.instance.lastAutoBackup = now;
 
@@ -121,6 +126,13 @@ class AutoSWBService extends ChangeNotifier {
 
   /// Trim the number of auto backup files based on age
   void trimBackups(String dirPath, int numberToKeep) {
+    if (Platform.isAndroid && dirPath.startsWith("content://")) {
+      Logging.instance.w(
+        "Android SAF lib doesn't provide a deletion API. Cannot trim/rotate out old backups",
+      );
+      return;
+    }
+
     final dir = Directory(dirPath);
     final List<Tuple2<DateTime, FileSystemEntity>> files = [];