image channel test

lib/assetsChannel.dart

@@ -76,11 +76,7 @@ class _AssestPlatformChannelState extends State<AssestPlatformChannel> {
                     color: Colors.pink[300],
                     width: 300,
                     height: 300,
-                    child: Image.memory(_imageData,
-                      color: Colors.purple,
-                      width: 200,
-                      height: 200,
-                    ),
+                    child: _imageWidget()
                   )
                 ],
               ),
@@ -90,4 +86,17 @@ class _AssestPlatformChannelState extends State<AssestPlatformChannel> {
       ),
     );
   }
+
+  Widget _imageWidget(){
+    if (_imageData != null) {
+      return Image.memory(_imageData,
+                      color: Colors.purple,
+                      width: 200,
+                      height: 200,
+                    );
+    }else{
+      return Text('i am not image');
+    }
+  }
+
 }