Fixed export error on Android SDK <= 28

android/app/src/main/AndroidManifest.xml

@@ -51,4 +51,7 @@
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
     <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM"/>
+    <uses-permission
+        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        android:maxSdkVersion="28"/>
 </manifest>

assets/translations/de.json

@@ -209,6 +209,7 @@
     "addCategory": "Kategorie hinzufügen",
     "label": "Bezeichnung",
     "language": "Sprache",
+    "storagePermissionDenied": "Storage permission denied",
     "tooManyRequestsTryAgainInMinutes": {
         "one": "Zu viele Anfragen (Rate begrenzt) - versuchen Sie es in {} Minute erneut",
         "other": "Zu viele Anfragen (Rate begrenzt) - versuchen Sie es in {} Minuten erneut"

assets/translations/en.json

@@ -209,6 +209,7 @@
     "addCategory": "Add Category",
     "label": "Label",
     "language": "Language",
+    "storagePermissionDenied": "Storage permission denied",
     "tooManyRequestsTryAgainInMinutes": {
         "one": "Too many requests (rate limited) - try again in {} minute",
         "other": "Too many requests (rate limited) - try again in {} minutes"

assets/translations/hu.json

@@ -207,6 +207,8 @@
     "categoryDeleteWarning": "A(z) {} összes app kategorizálatlan állapotba kerül.",
     "addCategory": "Új kategória",
     "label": "Címke",
+    "language": "Language",
+    "storagePermissionDenied": "Storage permission denied",
     "tooManyRequestsTryAgainInMinutes": {
         "one": "Túl sok kérés (korlátozott arány) – próbálja újra {} perc múlva",
         "other": "Túl sok kérés (korlátozott arány) – próbálja újra {} perc múlva"

assets/translations/it.json

@@ -209,6 +209,7 @@
     "addCategory": "Aggiungi categoria",
     "label": "Etichetta",
     "language": "Lingua",
+    "storagePermissionDenied": "Storage permission denied",
     "tooManyRequestsTryAgainInMinutes": {
         "one": "Troppe richieste (traffico limitato) - riprova tra {} minuto",
         "other": "Troppe richieste (traffico limitato) - riprova tra {} minuti"

assets/translations/ja.json

@@ -209,6 +209,7 @@
     "addCategory": "カテゴリを追加",
     "label": "ラベル",
     "language": "言語",
+    "storagePermissionDenied": "Storage permission denied",
     "tooManyRequestsTryAgainInMinutes": {
         "one": "リクエストが多すぎます（レート制限）- {}分後に再試行してください",
         "other": "リクエストが多すぎます（レート制限）- {}分後に再試行してください"

assets/translations/zh.json

@@ -209,6 +209,7 @@
     "addCategory": "Add Category",
     "label": "Label",
     "language": "Language",
+    "storagePermissionDenied": "Storage permission denied",
     "tooManyRequestsTryAgainInMinutes": {
         "one": "请求过多 (API 限制) - 在 {} 分钟后重试",
         "other": "请求过多 (API 限制) - 在 {} 分钟后重试"

lib/pages/import_export.dart

@@ -66,6 +66,8 @@ class _ImportExportPageState extends State<ImportExportPage> {
                                             showError(
                                                 tr('exportedTo', args: [path]),
                                                 context);
+                                          }).catchError((e) {
+                                            showError(e, context);
                                           });
                                         },
                                   child: Text(tr('obtainiumExport')))),

lib/providers/apps_provider.dart

@@ -17,6 +17,7 @@ import 'package:obtainium/providers/logs_provider.dart';
 import 'package:obtainium/providers/notifications_provider.dart';
 import 'package:obtainium/providers/settings_provider.dart';
 import 'package:package_archive_info/package_archive_info.dart';
+import 'package:permission_handler/permission_handler.dart';
 import 'package:provider/provider.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:flutter_fgbg/flutter_fgbg.dart';
@@ -706,6 +707,14 @@ class AppsProvider with ChangeNotifier {
       exportDir = await getExternalStorageDirectory();
       path = exportDir!.path;
     }
+    if ((await DeviceInfoPlugin().androidInfo).version.sdkInt <= 28) {
+      if (await Permission.storage.isDenied) {
+        await Permission.storage.request();
+      }
+      if (await Permission.storage.isDenied) {
+        throw ObtainiumError(tr('storagePermissionDenied'));
+      }
+    }
     File export = File(
         '${exportDir.path}/${tr('obtainiumExportHyphenatedLowercase')}-${DateTime.now().millisecondsSinceEpoch}.json');
     export.writeAsStringSync(