No file access for txt file in Kotlin

Question

I tried to save a text file to internal storage of the app but it does not work

Code is

 val defFileName = "text.def"
    val ioFile = File(defFileName)
ioFile.createnewFile()
        ioFile.writeText("Hello World")

I have tried different code versions to achive it but every time I got

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
                            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
                        Caused by: java.lang.reflect.InvocationTargetException
                            at java.lang.reflect.Method.invoke(Native Method)
                            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 
                        Caused by: java.io.FileNotFoundException: hello_file: open failed: EROFS (Read-only file system)

EROFS ReadOnlyFileSystem

Any help?

Edit:

I get the path with

mContext.applicationInfo.dataDir.toString()

This code runs without error and ioDefFile ="xxx.def"

  val fileOutputStream:FileOutputStream

  try {

            fileOutputStream = context.openFileOutput(ioDefFile, Context.MODE_PRIVATE)
         fileOutputStream.write("just a textString".toByteArray())

        }catch (e: Exception){
            e.printStackTrace()
        }

This code says -> open failed: EROFS (Read-only file system)

 try{
        val fileWriter = FileWriter(ioDefFile)

        for (x in 0..(DSSize-1)){
            fileWriter.write(dl[x]+ "\n")
           
        }

        fileWriter.close()
    } catch (exception: Exception){
        println(exception.message)
    }

Did not see the error in Code 2 - it did not work with oder without adding the path

Answer 1

Now it works :)

val foStream: FileOutputStream  

try {

            foStream = context.openFileOutput(ioDefFile, Context.MODE_PRIVATE)

            for (x in 0..(DSSize - 1)) {
                foStream.bufferedWriter().write(dl[x])
                foStream.bufferedWriter().newLine()
                
            }


        } catch (e: Exception) {
            e.printStackTrace()
        }