Enabled download functionality for android and added share functionality for document pdfs

android/app/build.gradle

@@ -26,7 +26,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 31
+    compileSdkVersion 33
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8

android/build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.5.31'
+    ext.kotlin_version = '1.7.0'
     repositories {
         google()
         mavenCentral()

lib/features/documents/view/pages/document_details_page.dart

@@ -1,6 +1,8 @@
+import 'dart:developer' as dev;
 import 'dart:io';
 import 'dart:math';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_paperless_mobile/core/bloc/label_bloc_provider.dart';
@@ -26,6 +28,7 @@ import 'package:flutter_paperless_mobile/generated/l10n.dart';
 import 'package:flutter_paperless_mobile/util.dart';
 import 'package:intl/intl.dart';
 import 'package:path_provider/path_provider.dart';
+import 'package:share_plus/share_plus.dart';
 
 class DocumentDetailsPage extends StatefulWidget {
   final int documentId;
@@ -73,12 +76,16 @@ class _DocumentDetailsPageState extends State<DocumentDetailsPage> {
                     ).padded(const EdgeInsets.symmetric(horizontal: 8.0)),
                     IconButton(
                       icon: const Icon(Icons.download),
-                      onPressed: null, //() => _onDownload(document), //TODO: FIX
+                      onPressed: Platform.isAndroid ? () => _onDownload(document) : null,
                     ),
                     IconButton(
                       icon: const Icon(Icons.open_in_new),
                       onPressed: () => _onOpen(document),
                     ).padded(const EdgeInsets.symmetric(horizontal: 8.0)),
+                    IconButton(
+                      icon: const Icon(Icons.share),
+                      onPressed: () => _onShare(document),
+                    ),
                   ],
                 ),
               ),
@@ -313,31 +320,43 @@ class _DocumentDetailsPageState extends State<DocumentDetailsPage> {
   }
 
   Future<void> _onDownload(DocumentModel document) async {
-    setState(() {
-      _isDownloadPending = true;
-    });
+    if (!Platform.isAndroid) {
+      showSnackBar(context, "This feature is currently only supported on Android!");
+      return;
+    }
+    setState(() => _isDownloadPending = true);
     getIt<DocumentRepository>().download(document).then((bytes) async {
-      //FIXME: logic currently flawed, some error somewhere but cannot look into directory...
-      final dir = await getApplicationDocumentsDirectory();
-      final dirPath = dir.path + "/files/";
-      var filePath = dirPath + document.originalFileName;
-
-      if (File(filePath).existsSync()) {
-        final count = dir
-            .listSync()
-            .where((entity) => (entity.path.contains(document.originalFileName)))
-            .fold<int>(0, (previous, element) => previous + 1);
-        final extSeperationIdx = filePath.lastIndexOf(".");
-        filePath =
-            filePath.replaceRange(extSeperationIdx, extSeperationIdx + 1, " (${count + 1}).");
-      }
-      Directory(dirPath).createSync();
+      final Directory dir =
+          (await getExternalStorageDirectories(type: StorageDirectory.downloads))!.first;
+      String filePath = "${dir.path}/${document.originalFileName}";
+      //TODO: Add replacement mechanism here (ask user if file should be replaced if exists)
       await File(filePath).writeAsBytes(bytes);
-      _isDownloadPending = false;
-      showSnackBar(context, "Document successfully downloaded to $filePath"); //TODO: INTL
+      setState(() => _isDownloadPending = false);
+      dev.log("File downloaded to $filePath");
     });
   }
 
+  ///
+  /// Downloads file to temporary directory, from which it can then be shared.
+  ///
+  Future<void> _onShare(DocumentModel document) async {
+    Uint8List documentBytes = await getIt<DocumentRepository>().download(document);
+    final dir = await getTemporaryDirectory();
+    final String path = "${dir.path}/${document.originalFileName}";
+    await File(path).writeAsBytes(documentBytes);
+    Share.shareXFiles(
+      [
+        XFile(
+          path,
+          name: document.originalFileName,
+          mimeType: "application/pdf",
+          lastModified: document.modified,
+        )
+      ],
+      subject: document.title,
+    );
+  }
+
   Future<void> _onDelete(DocumentModel document) async {
     showDialog(
         context: context,

lib/main.dart

@@ -20,6 +20,7 @@ import 'package:form_builder_validators/form_builder_validators.dart';
 import 'package:intl/intl.dart';
 import 'package:intl/intl_standalone.dart';
 import 'package:package_info_plus/package_info_plus.dart';
+import 'package:path_provider/path_provider.dart';
 
 void main() async {
   final widgetsBinding = WidgetsFlutterBinding.ensureInitialized();
@@ -30,6 +31,8 @@ void main() async {
   HttpOverrides.global = X509HttpOverrides();
 
   configureDependencies();
+  // Remove temporarily downloaded files.
+  (await getTemporaryDirectory()).deleteSync(recursive: true);
 
   kPackageInfo = await PackageInfo.fromPlatform();
   // Load application settings and stored authentication data

pubspec.lock

@@ -246,6 +246,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.5.0"
+  cross_file:
+    dependency: transitive
+    description:
+      name: cross_file
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.3+2"
   crypto:
     dependency: transitive
     description:
@@ -898,7 +905,7 @@ packages:
       name: package_info_plus_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   path:
     dependency: transitive
     description:
@@ -926,7 +933,7 @@ packages:
       name: path_provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.10"
+    version: "2.0.11"
   path_provider_android:
     dependency: transitive
     description:
@@ -968,7 +975,7 @@ packages:
       name: path_provider_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.3"
   pdf:
     dependency: "direct main"
     description:
@@ -1109,6 +1116,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.27.4"
+  share_plus:
+    dependency: "direct main"
+    description:
+      name: share_plus
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.2.0"
+  share_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: share_plus_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.2.0"
   shared_preferences:
     dependency: transitive
     description:
@@ -1407,14 +1428,14 @@ packages:
       name: url_launcher_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.5"
+    version: "2.1.1"
   url_launcher_web:
     dependency: transitive
     description:
       name: url_launcher_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.11"
+    version: "2.0.13"
   url_launcher_windows:
     dependency: transitive
     description:
@@ -1477,7 +1498,7 @@ packages:
       name: win32
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.7.0"
+    version: "3.0.1"
   xdg_directories:
     dependency: transitive
     description:

pubspec.yaml

@@ -17,7 +17,7 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
 # Read more about iOS versioning at
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-version: 1.0.1
+version: 1.0.2
 
 environment:
   sdk: ">=2.17.0 <3.0.0"
@@ -72,6 +72,7 @@ dependencies:
   connectivity_plus: ^2.3.9
 
   flutter_native_splash: ^2.2.11
+  share_plus: ^6.2.0
 
 dev_dependencies:
   integration_test: