问错误信息:字段需要接口级别11 (当前最小值为8)：android.os.AsyncTask#THREAD_POOL_EXECUTOR

EN

@Override
                protected void onPostExecute(Void result) {
                    buttonDOpen.setOnClickListener(new View.OnClickListener() {
                        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
                        public void onClick(View v) {
                            final Sender messageSender = new Sender(); // Initialize chat sender AsyncTask.
                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                                messageSender.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                            } else {
                                messageSender.execute();
                            }
                        }
                    });