feat(share_plus): added ability to open sharing activity in a new task in android

packages/share_plus/share_plus/android/src/main/kotlin/dev/fluttercommunity/plus/share/Share.kt

@@ -66,6 +66,7 @@ internal class Share(
         val paths = (arguments["paths"] as List<*>?)?.filterIsInstance<String>()
         val mimeTypes = (arguments["mimeTypes"] as List<*>?)?.filterIsInstance<String>()
         val fileUris = paths?.let { getUrisForPaths(paths) }
+        val useNewTask = arguments["useNewTask"] as Boolean;
 
         // Create Share Intent
         val shareIntent = Intent()
@@ -148,6 +149,13 @@ internal class Share(
             }
         }
 
+        if (useNewTask) {
+            chooserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            chooserIntent.addFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK)
+        } else if (activity == null) {
+            chooserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        }
+
         // Launch share intent
         startActivity(chooserIntent, withResult)
     }
@@ -160,7 +168,6 @@ internal class Share(
                 activity!!.startActivity(intent)
             }
         } else {
-            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
             if (withResult) {
                 // We need to cancel the callback to avoid deadlocking on the Dart side
                 manager.unavailable()

packages/share_plus/share_plus_platform_interface/lib/method_channel/method_channel_share.dart

@@ -41,6 +41,7 @@ class MethodChannelShare extends SharePlatform {
       if (params.subject != null) 'subject': params.subject,
       if (params.title != null) 'title': params.title,
       if (params.uri != null) 'uri': params.uri.toString(),
+      'useNewTask': params.useNewTask,
     };
 
     if (params.sharePositionOrigin != null) {

packages/share_plus/share_plus_platform_interface/lib/platform_interface/share_plus_platform.dart

@@ -142,6 +142,12 @@ class ShareParams {
   ///   Parameter ignored on other platforms.
   final List<CupertinoActivityType>? excludedCupertinoActivities;
 
+  /// Whether to use a new task when sharing on Android.
+  ///
+  /// * Supported platforms: Android
+  ///  Parameter ignored on other platforms.
+  final bool useNewTask;
+
   ShareParams({
     this.text,
     this.subject,
@@ -154,6 +160,7 @@ class ShareParams {
     this.downloadFallbackEnabled = true,
     this.mailToFallbackEnabled = true,
     this.excludedCupertinoActivities,
+    this.useNewTask = false,
   });
 }
 

packages/share_plus/share_plus_platform_interface/test/share_plus_platform_interface_test.dart

@@ -71,6 +71,7 @@ void main() {
     );
     verify(mockChannel.invokeMethod<String>('share', <String, dynamic>{
       'uri': 'https://pub.dev/packages/share_plus',
+      'useNewTask': false,
       'originX': 1.0,
       'originY': 2.0,
       'originWidth': 3.0,
@@ -89,6 +90,7 @@ void main() {
     verify(mockChannel.invokeMethod<String>('share', <String, dynamic>{
       'text': 'some text to share',
       'subject': 'some subject to share',
+      'useNewTask': false,
       'originX': 1.0,
       'originY': 2.0,
       'originWidth': 3.0,
@@ -112,6 +114,7 @@ void main() {
           'mimeTypes': ['image/png'],
           'subject': 'some subject to share',
           'text': 'some text to share',
+          'useNewTask': false,
           'originX': 1.0,
           'originY': 2.0,
           'originWidth': 3.0,
@@ -127,6 +130,7 @@ void main() {
       verify(mockChannel.invokeMethod<String>('share', <String, dynamic>{
         'paths': [fd.path],
         'mimeTypes': ['image/png'],
+        'useNewTask': false,
       }));
     });
   });
@@ -141,6 +145,7 @@ void main() {
       verify(mockChannel.invokeMethod<String>('share', <String, dynamic>{
         'paths': [fd.path],
         'mimeTypes': ['*/*'],
+        'useNewTask': false,
       }));
     });
   });
@@ -190,6 +195,7 @@ void main() {
     verify(mockChannel.invokeMethod<String>('share', <String, dynamic>{
       'text': 'some text to share',
       'subject': 'some subject to share',
+      'useNewTask': false,
       'originX': 1.0,
       'originY': 2.0,
       'originWidth': 3.0,
@@ -206,6 +212,7 @@ void main() {
       verify(mockChannel.invokeMethod<String>('share', <String, dynamic>{
         'paths': [fd.path],
         'mimeTypes': ['image/png'],
+        'useNewTask': false,
       }));
       expect(result, success);
     });