rename constructor of WeChatImage

example/lib/share_image_page.dart

@@ -54,7 +54,7 @@ class _ShareImagePageState extends State<ShareImagePage> {
                   text:
                       "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1534614311230&di=b17a892b366b5d002f52abcce7c4eea0&imgtype=0&src=http%3A%2F%2Fimg.mp.sohu.com%2Fupload%2F20170516%2F51296b2673704ae2992d0a28c244274c_th.png"),
               onChanged: (value) {
-                source = WeChatImage.fromNetwork(value);
+                source = WeChatImage.network(value);
               },
               keyboardType: TextInputType.multiline,
             ),
@@ -62,7 +62,7 @@ class _ShareImagePageState extends State<ShareImagePage> {
               decoration: InputDecoration(labelText: "缩略地址"),
               controller: TextEditingController(text: "//images/logo.png"),
               onChanged: (value) {
-                thumbnail = WeChatImage.fromAsset(value);
+                thumbnail = WeChatImage.asset(value);
               },
             ),
             new Row(

example/lib/share_mini_program.dart

@@ -95,7 +95,7 @@ class _ShareMiniProgramPageState extends State<ShareMiniProgramPage> {
         title: _title,
         path: _path,
         description: _description,
-        thumbnail: WeChatImage.fromNetwork(_thumbnail)
+        thumbnail: WeChatImage.network(_thumbnail)
     );
     shareToWeChat(model);
   }

example/lib/share_music.dart

@@ -122,7 +122,7 @@ class _ShareMusicPageState extends State<ShareMusicPage> {
         musicUrl: _musicUrl,
         scene: scene,
         musicLowBandUrl: _musicLowBandUrl,
-        thumbnail: WeChatImage.fromNetwork(_thumnail));
+        thumbnail: WeChatImage.network(_thumnail));
 
     shareToWeChat(model);
   }

example/lib/share_video_page.dart

@@ -118,7 +118,7 @@ class _ShareMusicPageState extends State<ShareVideoPage> {
     var model = new WeChatShareVideoModel(
         videoUrl: _videoUrl,
         videoLowBandUrl: _videoLowBandUrl,
-        thumbnail: WeChatImage.fromNetwork(_thumnail),
+        thumbnail: WeChatImage.network(_thumnail),
         description: _description,
         scene: this.scene,
         title: _title);

example/lib/share_web_page.dart

@@ -102,7 +102,7 @@ class ShareWebPagePageState extends State<ShareWebPagePage> {
     var model = WeChatShareWebPageModel(
       _url,
       title: _title,
-      thumbnail: WeChatImage.fromNetwork(_thumnail),
+      thumbnail: WeChatImage.network(_thumnail),
       scene: scene,
     );
     shareToWeChat(model);

lib/src/wechat_image.dart

@@ -25,25 +25,25 @@ class WeChatImage {
   final ImageSchema schema;
   final String suffix;
 
-  WeChatImage.fromNetwork(String source, {String suffix})
+  WeChatImage.network(String source, {String suffix})
       : assert(source != null && source.startsWith("http")),
         this.source = source,
         this.schema = ImageSchema.NETWORK,
         this.suffix = source.readSuffix(suffix);
 
-  WeChatImage.fromAsset(String source, {String suffix})
+  WeChatImage.asset(String source, {String suffix})
       : assert(source != null && source.trim().isNotEmpty),
         this.source = source,
         this.schema = ImageSchema.ASSET,
         this.suffix = source.readSuffix(suffix);
 
-  WeChatImage.fromFile(File source, {String suffix = ".jpeg"})
+  WeChatImage.file(File source, {String suffix = ".jpeg"})
       : assert(source != null),
         this.source = source.path,
         this.schema = ImageSchema.FILE,
         this.suffix = source.path.readSuffix(suffix);
 
-  WeChatImage.fromBinary(Uint8List source, {String suffix = ".jpeg"})
+  WeChatImage.binary(Uint8List source, {String suffix = ".jpeg"})
       : assert(source != null),
         assert(suffix != null && suffix.trim().isNotEmpty),
         this.source = source,