sample code of courotine call

mainactivity.kt

val scope = CoroutineScope(Job() + Dispatchers.Main)

    // #1
    scope.launch {
        withContext(Dispatchers.IO) {
            viewModel.delBill()
        }
    }

   // #2
   runBlocking {
    withContext(Dispatchers.IO) {
        viewModel.delBill()
    }}

viewmodel.kt

     suspend fun delBill() { // suspend is redundant  warning 
        var queryProc = ""
         delXML.forEach {

             queryProc += it.value
             //Log.d(this.javaClass.simpleName, "delBill:  ${queryProc}")

         }
        queryProc = "<NewDataSet>$queryProc</NewDataSet>"
        Log.d(this.javaClass.simpleName, "delBill: ${queryProc}")
        con?.deleteBills(queryProc,bills,result,date,page) // java file function 
    }