assets channel

lib/assetsChannel.dart

 import 'dart:async';
-
+import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
@@ -14,20 +14,21 @@ class _AssestPlatformChannelState extends State<AssestPlatformChannel> {
   static const EventChannel eventChannel =
       EventChannel('GMAssetsEventChannelName');
 
-  String _batteryLevel = 'Battery level: unknown.';
-  Object _imageData;
+  Uint8List _imageData;
+  String _tttt = 'ssss';
 
 
   Future<void> _editPortrait() async {
-    String batteryLevel;
+    Uint8List imageData;
     try {
-      final int result = await methodChannel.invokeMethod('editPortrait');
-      batteryLevel = 'Battery level: $result%.';
+      final result = await methodChannel.invokeMethod('editPortrait');
+      imageData = result;
     } on PlatformException {
-      batteryLevel = 'Failed to get battery level.';
+      imageData = null;
     }
     setState(() {
-      _batteryLevel = batteryLevel;
+      _imageData = imageData;
+      _tttt = 'aaaaa';
     });
   }
 
@@ -38,15 +39,11 @@ class _AssestPlatformChannelState extends State<AssestPlatformChannel> {
   }
 
   void _onEvent(Object event) {
-    _imageData = event;
-    print(event.runtimeType);
-    setState(() {
-    });
+    setState(() {});
   }
 
   void _onError(Object error) {
-    setState(() {
-    });
+    setState(() {});
   }
 
   @override
@@ -63,7 +60,7 @@ class _AssestPlatformChannelState extends State<AssestPlatformChannel> {
               Column(
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: <Widget>[
-                  Text(_batteryLevel, key: const Key('editPortrait')),
+                  Text(_tttt, key: const Key('editPortrait')),
                   Padding(
                     padding: const EdgeInsets.all(16.0),
                     child: RaisedButton(
@@ -89,12 +86,13 @@ 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');
+      return Center(
+        child: Text('I am not image'+_tttt),
+      );
     }
   }