如何在AsyncTask中创建进度对话框？

Question

我有一个返回StatusCode的FullRest API，我成功了，问题是，无法从AsyncTask调用进度对话框，我只想“显示”用户发生了什么，if(statusCode == 201) ..成功POST，到目前为止：

PostBaseClass ..

public class PostBase {

private static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
private String Url="http://192.168.0.101:3000/";

OkHttpClient client = new OkHttpClient();

 int POST(final PostModel model) throws IOException{
     Gson gson = new Gson();
     String modelJson = gson.toJson(model);

     RequestBody body =  RequestBody.create(JSON,modelJson);
     Request request = new Request.Builder()
             .url(Url + "api/gone/POST")
             .post(body)
             .build();
     Response response = client.newCall(request).execute();
     return response.code();
}

MainActivity ..

public void MakePost(final PostModel postModel){
    new AsyncTask<Void,Void,Void>(){
        @Override
        protected Void doInBackground(Void... params) {
            try {
                PostBase postBase = new PostBase();
                statusCode = postBase.POST(postModel);
                if(statusCode == 201){
                  //TODO
                }else {
                  //TODO
                }
            } catch (IOException e) {
                e.printStackTrace();

            }
            return null;
        }
    }.execute();
}