add share panel title for android and subject for both android and ios

android/src/main/java/com/zt/shareextend/ShareExtendPlugin.java

@@ -30,6 +30,8 @@ public class ShareExtendPlugin implements MethodChannel.MethodCallHandler, Plugi
     private final Registrar mRegistrar;
     private List<String> list;
     private String type;
+    private String sharePanelTitle;
+    private String subject;
 
     public static void registerWith(Registrar registrar) {
         MethodChannel channel = new MethodChannel(registrar.messenger(), CHANNEL);
@@ -50,22 +52,24 @@ public class ShareExtendPlugin implements MethodChannel.MethodCallHandler, Plugi
                 throw new IllegalArgumentException("Map argument expected");
             }
             // Android does not support showing the share sheet at a particular point on screen.
-            share((List) call.argument("list"), (String) call.argument("type"));
+            list = call.argument("list");
+            type = call.argument("type");
+            sharePanelTitle = call.argument("sharePanelTitle");
+            subject = call.argument("subject");
+            share(list, type, sharePanelTitle, subject);
             result.success(null);
         } else {
             result.notImplemented();
         }
     }
 
-    private void share(List<String> list, String type) {
+    private void share(List<String> list, String type, String sharePanelTitle, String subject) {
         if (list == null || list.isEmpty()) {
             throw new IllegalArgumentException("Non-empty list expected");
         }
-        this.list = list;
-        this.type = type;
-
         Intent shareIntent = new Intent();
         shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+        shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
 
         if ("text".equals(type)) {
             shareIntent.setAction(Intent.ACTION_SEND);
@@ -101,11 +105,11 @@ public class ShareExtendPlugin implements MethodChannel.MethodCallHandler, Plugi
                 shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uriList);
             }
         }
-        startChooserActivity(shareIntent);
+        startChooserActivity(shareIntent, sharePanelTitle);
     }
 
-    private void startChooserActivity(Intent shareIntent) {
-        Intent chooserIntent = Intent.createChooser(shareIntent, null /* dialog title optional */);
+    private void startChooserActivity(Intent shareIntent,String sharePanelTitle) {
+        Intent chooserIntent = Intent.createChooser(shareIntent, sharePanelTitle /* dialog subject optional */);
         if (mRegistrar.activity() != null) {
             mRegistrar.activity().startActivity(chooserIntent);
         } else {
@@ -126,7 +130,7 @@ public class ShareExtendPlugin implements MethodChannel.MethodCallHandler, Plugi
     @Override
     public boolean onRequestPermissionsResult(int requestCode, String[] perms, int[] grantResults) {
         if (requestCode == CODE_ASK_PERMISSION && grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-            share(list, type);
+            share(list, type, sharePanelTitle, subject);
         }
         return false;
     }

example/lib/main.dart

@@ -35,7 +35,9 @@ class _MyAppState extends State<MyApp> {
               children: <Widget>[
                 RaisedButton(
                   onPressed: () {
-                    ShareExtend.share("share text", "text");
+                    ShareExtend.share("share text", "text",
+                        sharePanelTitle: "share text title",
+                        subject: "share text subject");
                   },
                   child: Text("share text"),
                 ),
@@ -44,7 +46,9 @@ class _MyAppState extends State<MyApp> {
                     File f = await ImagePicker.pickImage(
                         source: ImageSource.gallery);
                     if (f != null) {
-                      ShareExtend.share(f.path, "image");
+                      ShareExtend.share(f.path, "image",
+                          sharePanelTitle: "share image title",
+                          subject: "share image subject");
                     }
                   },
                   child: Text("share image"),

ios/Classes/ShareExtendPlugin.m

@@ -12,6 +12,7 @@
             NSDictionary *arguments = [call arguments];
             NSArray *array = arguments[@"list"];
             NSString *shareType = arguments[@"type"];
+            NSString *subject = arguments[@"subject"];
             
             if (array.count == 0) {
                 result(
@@ -31,7 +32,7 @@
             }
         
             if ([shareType isEqualToString:@"text"]) {
-                [self share:array atSource:originRect];
+                [self share:array atSource:originRect withSubject:subject];
                 result(nil);
             }  else if ([shareType isEqualToString:@"image"]) {
                 NSMutableArray * imageArray = [[NSMutableArray alloc] init];
@@ -39,14 +40,14 @@
                     UIImage *image = [UIImage imageWithContentsOfFile:path];
                     [imageArray addObject:image];
                 }
-                [self share:imageArray atSource:originRect];
+                [self share:imageArray atSource:originRect withSubject:subject];
             } else {
                 NSMutableArray * urlArray = [[NSMutableArray alloc] init];
                 for (NSString * path in array) {
                     NSURL *url = [NSURL fileURLWithPath:path];
                     [urlArray addObject:url];
                 }
-                [self share:urlArray atSource:originRect];
+                [self share:urlArray atSource:originRect withSubject:subject];
                 result(nil);
             }
         } else {
@@ -55,7 +56,7 @@
     }];
 }
 
-+ (void)share:(NSArray *)sharedItems atSource:(CGRect)origin {
++ (void)share:(NSArray *)sharedItems atSource:(CGRect)origin withSubject:(NSString *) subject {
     UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:sharedItems applicationActivities:nil];
     
     UIViewController *controller =[UIApplication sharedApplication].keyWindow.rootViewController;
@@ -64,6 +65,7 @@
     if (!CGRectIsEmpty(origin)) {
         activityViewController.popoverPresentationController.sourceRect = origin;
     }
+    [activityViewController setValue:subject forKey:@"subject"];
     [controller presentViewController:activityViewController animated:YES completion:nil];
 }
 

lib/share_extend.dart

@@ -21,11 +21,14 @@ class ShareExtend {
   }
 
   static Future<void> share(String text, String type,
-      {Rect sharePositionOrigin}) {
+      {Rect sharePositionOrigin, String sharePanelTitle, String subject = ""}) {
     assert(text != null);
     assert(text.isNotEmpty);
     List<String> list = [text];
-    return _shareInner(list, type, sharePositionOrigin: sharePositionOrigin);
+    return _shareInner(list, type,
+        sharePositionOrigin: sharePositionOrigin,
+        sharePanelTitle: sharePanelTitle,
+        subject: subject);
   }
 
   /// method to share with system ui
@@ -36,11 +39,13 @@ class ShareExtend {
   /// [sharePositionOrigin] only supports ios
   ///
   static Future<void> _shareInner(List<String> list, String type,
-      {Rect sharePositionOrigin}) {
+      {Rect sharePositionOrigin, String sharePanelTitle, String subject}) {
     assert(list != null && list.isNotEmpty);
     final Map<String, dynamic> params = <String, dynamic>{
       'list': list,
-      'type': type
+      'type': type,
+      'sharePanelTitle': sharePanelTitle,
+      'subject': subject
     };
     if (sharePositionOrigin != null) {
       params['originX'] = sharePositionOrigin.left;