fix android hot reload bugs.

Author: dujiepeng

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

@@ -278,15 +278,19 @@ private void kickAllDevices(JSONObject param, String channelName, Result result)
 
     }
 
+    private EMOptions options = null;
     private void init(JSONObject param, String channelName, Result result) throws JSONException {
-        EMOptions options = EMOptionsHelper.fromJson(param, this.context);
+        if (options != null) {
+            onSuccess(result, channelName, null);
+            return;
+        }
+        options = EMOptionsHelper.fromJson(param, this.context);
         EMClient.getInstance().init(this.context, options);
         EMClient.getInstance().setDebugMode(param.getBoolean("debugModel"));
 
         bindingManagers();
         registerEaseListener();
         onSuccess(result, channelName, null);
-
     }
 
     private void renewToken(JSONObject param, String channelName, Result result) throws JSONException {