FileReader.kt

import java.io.File

val inputStream = File("Jugemu.txt").inputStream()
val readAllLinesWithInputStream: String
    get() {
        return inputStream.bufferedReader().use {
            it.readText()
        }
    }

val bufferedReader = File("Jugemu.txt").bufferedReader()
val readEachLinesWithBufferedReader: List<String>
    get() {
        val lineList = mutableListOf<String>()
        bufferedReader.useLines { lines ->
            lines.forEach {
                lineList.add(it)
            }
        }
        return lineList
    }

fun main() {
    print(readAllLinesWithInputStream)
    readEachLinesWithBufferedReader.forEach {
        println(it)
    }
}

ReadJsonInAsset.kt

try {
      val inputStream:InputStream = assets.open("news_data_file.json")
      val inputString = inputStream.bufferedReader().use{it.readText()}
      Log.d(TAG,inputString)
    } catch (e:Exception){
        Log.d(TAG, e.toString())
    }