diff --git a/android/src/main/java/com/jiguang/jpush/JPushEventReceiver.java b/android/src/main/java/com/jiguang/jpush/JPushEventReceiver.java
index fd74ea4f..26beaee7 100644
--- a/android/src/main/java/com/jiguang/jpush/JPushEventReceiver.java
+++ b/android/src/main/java/com/jiguang/jpush/JPushEventReceiver.java
@@ -1,6 +1,8 @@
 package com.jiguang.jpush;
 
 import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
 import android.util.Log;
 
 import org.json.JSONException;
@@ -17,9 +19,10 @@
 import io.flutter.plugin.common.MethodChannel.Result;
 
 public class JPushEventReceiver extends JPushMessageReceiver {
+    private Handler handler = new Handler(Looper.getMainLooper());
 
     @Override
-    public void onTagOperatorResult(Context context, JPushMessage jPushMessage) {
+    public void onTagOperatorResult(Context context, final JPushMessage jPushMessage) {
         super.onTagOperatorResult(context, jPushMessage);
 
         JSONObject resultJson = new JSONObject();
@@ -31,7 +34,7 @@ public void onTagOperatorResult(Context context, JPushMessage jPushMessage) {
             e.printStackTrace();
         }
 
-        Result callback = JPushPlugin.instance.callbackMap.get(sequence);//instance.eventCallbackMap.get(sequence);
+        final Result callback = JPushPlugin.instance.callbackMap.get(sequence);//instance.eventCallbackMap.get(sequence);
 
         if (callback == null) {
             Log.i("JPushPlugin", "Unexpected error, callback is null!");
@@ -41,33 +44,42 @@ public void onTagOperatorResult(Context context, JPushMessage jPushMessage) {
         if (jPushMessage.getErrorCode() == 0) { // success
             Set<String> tags = jPushMessage.getTags();
             List<String> tagList = new ArrayList<>(tags);
-            Map<String, Object> res = new HashMap<>();
+            final Map<String, Object> res = new HashMap<>();
             res.put("tags", tagList);
-            callback.success(res);
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    callback.success(res);
+                }
+            });
         } else {
             try {
                 resultJson.put("code", jPushMessage.getErrorCode());
             } catch (JSONException e) {
                 e.printStackTrace();
             }
-            callback.error(Integer.toString(jPushMessage.getErrorCode()), "", "");
+            handler.post(new Runnable() {
+                             @Override
+                             public void run() {
+                                 callback.error(Integer.toString(jPushMessage.getErrorCode()), "", "");
+                             }
+                         }
+            );
         }
 
         JPushPlugin.instance.callbackMap.remove(sequence);
     }
 
 
-
     @Override
-    public void onCheckTagOperatorResult(Context context, JPushMessage jPushMessage) {
+    public void onCheckTagOperatorResult(Context context, final JPushMessage jPushMessage) {
         super.onCheckTagOperatorResult(context, jPushMessage);
 
 
-
         int sequence = jPushMessage.getSequence();
 
 
-        Result callback = JPushPlugin.instance.callbackMap.get(sequence);
+        final Result callback = JPushPlugin.instance.callbackMap.get(sequence);
 
         if (callback == null) {
             Log.i("JPushPlugin", "Unexpected error, callback is null!");
@@ -77,24 +89,33 @@ public void onCheckTagOperatorResult(Context context, JPushMessage jPushMessage)
         if (jPushMessage.getErrorCode() == 0) {
             Set<String> tags = jPushMessage.getTags();
             List<String> tagList = new ArrayList<>(tags);
-            Map<String, Object> res = new HashMap<>();
+            final Map<String, Object> res = new HashMap<>();
             res.put("tags", tagList);
-            callback.success(res);
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    callback.success(res);
+                }
+            });
         } else {
-
-            callback.error(Integer.toString(jPushMessage.getErrorCode()), "", "");
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    callback.error(Integer.toString(jPushMessage.getErrorCode()), "", "");
+                }
+            });
         }
 
         JPushPlugin.instance.callbackMap.remove(sequence);
     }
 
     @Override
-    public void onAliasOperatorResult(Context context, JPushMessage jPushMessage) {
+    public void onAliasOperatorResult(Context context, final JPushMessage jPushMessage) {
         super.onAliasOperatorResult(context, jPushMessage);
 
         int sequence = jPushMessage.getSequence();
 
-        Result callback = JPushPlugin.instance.callbackMap.get(sequence);
+        final Result callback = JPushPlugin.instance.callbackMap.get(sequence);
 
         if (callback == null) {
             Log.i("JPushPlugin", "Unexpected error, callback is null!");
@@ -102,12 +123,21 @@ public void onAliasOperatorResult(Context context, JPushMessage jPushMessage) {
         }
 
         if (jPushMessage.getErrorCode() == 0) { // success
-            Map<String, Object> res = new HashMap<>();
-            res.put("alias", (jPushMessage.getAlias() == null)? "" : jPushMessage.getAlias());
-            callback.success(res);
-
+            final Map<String, Object> res = new HashMap<>();
+            res.put("alias", (jPushMessage.getAlias() == null) ? "" : jPushMessage.getAlias());
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    callback.success(res);
+                }
+            });
         } else {
-            callback.error(Integer.toString(jPushMessage.getErrorCode()), "", "");
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    callback.error(Integer.toString(jPushMessage.getErrorCode()), "", "");
+                }
+            });
         }
 
         JPushPlugin.instance.callbackMap.remove(sequence);
diff --git a/example/pubspec.lock b/example/pubspec.lock
index c3fe1c09..25c3dc07 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -5,70 +5,70 @@ packages:
     dependency: transitive
     description:
       name: analyzer
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.32.4"
+    version: "0.36.3"
   args:
     dependency: transitive
     description:
       name: args
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.5.0"
+    version: "1.5.2"
   async:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.8"
+    version: "2.1.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.0.4"
   charcode:
     dependency: transitive
     description:
       name: charcode
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.1.2"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.14.11"
   convert:
     dependency: transitive
     description:
       name: convert
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.2"
+    version: "2.1.1"
   crypto:
     dependency: transitive
     description:
       name: crypto
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.0.6"
   csslib:
     dependency: transitive
     description:
       name: csslib
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.14.5"
+    version: "0.16.0"
   cupertino_icons:
     dependency: "direct main"
     description:
       name: cupertino_icons
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.1.2"
   flutter:
@@ -85,49 +85,49 @@ packages:
     dependency: transitive
     description:
       name: front_end
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.1.4"
+    version: "0.1.18"
   glob:
     dependency: transitive
     description:
       name: glob
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.1.7"
   html:
     dependency: transitive
     description:
       name: html
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.13.3+3"
+    version: "0.14.0+2"
   http:
     dependency: transitive
     description:
       name: http
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.11.3+17"
+    version: "0.12.0+2"
   http_multi_server:
     dependency: transitive
     description:
       name: http_multi_server
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.5"
+    version: "2.0.6"
   http_parser:
     dependency: transitive
     description:
       name: http_parser
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "3.1.3"
   io:
     dependency: transitive
     description:
       name: io
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.3.3"
   jpush_flutter:
@@ -141,156 +141,149 @@ packages:
     dependency: transitive
     description:
       name: js
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.6.1+1"
   json_rpc_2:
     dependency: transitive
     description:
       name: json_rpc_2
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.9"
+    version: "2.1.0"
   kernel:
     dependency: transitive
     description:
       name: kernel
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.4"
-  logging:
-    dependency: transitive
-    description:
-      name: logging
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.11.3+2"
+    version: "0.3.18"
   matcher:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.3+1"
+    version: "0.12.5"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.1.6"
   mime:
     dependency: transitive
     description:
       name: mime
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.9.6+2"
+    version: "0.9.6+3"
   mockito:
     dependency: "direct dev"
     description:
       name: mockito
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "3.0.0"
+    version: "3.0.2"
   multi_server_socket:
     dependency: transitive
     description:
       name: multi_server_socket
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.0.2"
   node_preamble:
     dependency: transitive
     description:
       name: node_preamble
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.4.4"
   package_config:
     dependency: transitive
     description:
       name: package_config
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.0.5"
   package_resolver:
     dependency: transitive
     description:
       name: package_resolver
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.4"
+    version: "1.0.10"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.6.2"
-  platform:
+  pedantic:
     dependency: transitive
     description:
-      name: platform
-      url: "https://pub.dartlang.org"
+      name: pedantic
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.2.0"
-  plugin:
+    version: "1.5.0"
+  platform:
     dependency: transitive
     description:
-      name: plugin
-      url: "https://pub.dartlang.org"
+      name: platform
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.0+3"
+    version: "2.2.0"
   pool:
     dependency: transitive
     description:
       name: pool
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.6"
+    version: "1.4.0"
   pub_semver:
     dependency: transitive
     description:
       name: pub_semver
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.4.2"
   quiver:
     dependency: transitive
     description:
       name: quiver
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.0+1"
+    version: "2.0.2"
   shelf:
     dependency: transitive
     description:
       name: shelf
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.7.3+3"
+    version: "0.7.5"
   shelf_packages_handler:
     dependency: transitive
     description:
       name: shelf_packages_handler
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.0.4"
   shelf_static:
     dependency: transitive
     description:
       name: shelf_static
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.2.8"
   shelf_web_socket:
     dependency: transitive
     description:
       name: shelf_web_socket
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.2+4"
+    version: "0.2.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -300,106 +293,113 @@ packages:
     dependency: transitive
     description:
       name: source_map_stack_trace
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.1.5"
   source_maps:
     dependency: transitive
     description:
       name: source_maps
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.10.7"
+    version: "0.10.8"
   source_span:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.4.1"
+    version: "1.5.5"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.9.3"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.6.8"
+    version: "2.0.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "1.0.4"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.1"
+    version: "1.1.0"
   test:
     dependency: "direct dev"
     description:
       name: test
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.0"
-  typed_data:
+    version: "1.6.1"
+  test_api:
     dependency: transitive
     description:
-      name: typed_data
-      url: "https://pub.dartlang.org"
+      name: test_api
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.6"
-  utf:
+    version: "0.2.4"
+  test_core:
     dependency: transitive
     description:
-      name: utf
-      url: "https://pub.dartlang.org"
+      name: test_core
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.9.0+5"
+    version: "0.2.3"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.6"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.0.8"
   vm_service_client:
     dependency: transitive
     description:
       name: vm_service_client
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.6"
+    version: "0.2.6+2"
   watcher:
     dependency: transitive
     description:
       name: watcher
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.9.7+10"
   web_socket_channel:
     dependency: transitive
     description:
       name: web_socket_channel
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.9"
+    version: "1.0.13"
   yaml:
     dependency: transitive
     description:
       name: yaml
-      url: "https://pub.dartlang.org"
+      url: "https://pub.flutter-io.cn"
     source: hosted
     version: "2.1.15"
 sdks:
-  dart: ">=2.0.0-dev.68.0 <3.0.0"
+  dart: ">=2.2.0 <3.0.0"