文件分享加了个fileExtension参数；flutter 1.12.13下能正常build apk

android/build.gradle

@@ -25,7 +25,7 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 28
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'

ios/Classes/handler/FluwxShareHandler.m

@@ -320,7 +320,7 @@ NSObject <FlutterPluginRegistrar> *_registrar;
         dispatch_async(dispatch_get_main_queue(), ^{
             NSString *scene = call.arguments[fluwxKeyScene];
             BOOL done = [WXApiRequestHandler sendFileData:data
-                                            fileExtension:@"pdf"
+                                            fileExtension:call.arguments[@"fileExtension"]
                                                     Title:call.arguments[fluwxKeyTitle]
                                               Description:call.arguments[fluwxKeyDescription]
                                                ThumbImage:thumbnailImage          

lib/src/models/wechat_share_models.dart

@@ -343,6 +343,7 @@ class WeChatShareWebPageModel extends WeChatShareModel {
 class WeChatShareFileModel extends WeChatShareModel {
   final String transaction;
   final String filePath;
+  final String fileExtension;
   final String thumbnail;
   final String title;
   final String description;
@@ -350,6 +351,7 @@ class WeChatShareFileModel extends WeChatShareModel {
   WeChatShareFileModel({
     String transaction,
     this.filePath,
+    this.fileExtension:"pdf",
     this.title: "",
     this.description: "",
     String thumbnail,
@@ -372,6 +374,7 @@ class WeChatShareFileModel extends WeChatShareModel {
       _transaction: transaction,
       _scene: scene.toString(),
       "filePath": filePath,
+      "fileExtension": fileExtension,
       _thumbnail: thumbnail,
       _title: title,
       _description: description,