Async Task to read json file

JsonReaderTask.kt

private inner class JsonExecuter : AsyncTask<Void, Void, String>() {
        override fun doInBackground(vararg p0: Void?): String {
            return getJsonFromAssets()!!
        }

        override fun onPostExecute(result: String?) {
            super.onPostExecute(result)
            val moshi = Moshi.Builder().build()
            val jsonAdapter = moshi.adapter(Reddit::class.java)

            var red: Reddit? = jsonAdapter.fromJson(result)

            mList = red?.data?.children!!

            rvReddit?.adapter = RedditAdapter(mContext, mList)
        }
    }