Merge pull request #472 from dujiepeng/flutter2

修复安卓下resend不回调onError方法

Author: dujiepeng

android/src/main/java/com/easemob/im_flutter_sdk/EMChatManagerWrapper.java

@@ -167,14 +167,17 @@ public void onProgress(int progress, String status) {
                 });
             }
 
+
             @Override
             public void onError(int code, String desc) {
+                Map<String, Object> data = new HashMap<>();
+                data.put("code", code);
+                data.put("description", desc);
                 post(() -> {
                     Map<String, Object> map = new HashMap<>();
                     map.put("message", EMMessageHelper.toJson(finalMsg));
                     map.put("localTime", finalMsg.localTime());
-                    map.put("code", code);
-                    map.put("description", desc);
+                    map.put("error", data);
                     messageChannel.invokeMethod(EMSDKMethod.onMessageError, map);
                 });
             }

example/lib/pages/chat/chat_input_bar.dart

@@ -1,5 +1,4 @@
 import 'package:easeim_flutter_demo/widgets/common_widgets.dart';
-import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 
 enum ChatInputBarType {