requestussdapi26

@RequiresApi(26)
    fun requestUssdUsingTelephonyManager(ussd: String, simSlot: Int) {
        val ussd =  ussd.replace("%23", Uri.decode("#"))
        Log.e("ussd", "requesting for ussd $ussd")
        val manager = getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
        val handler = Handler()
        val callback = object : TelephonyManager.UssdResponseCallback() {
            override fun onReceiveUssdResponse(telephonyManager: TelephonyManager, request: String, response: CharSequence) {
                super.onReceiveUssdResponse(telephonyManager, request, response) // what if i remove this line
                EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, response.toString()))
                textview_log.text = "Success with response : $response \n request $request"
                Log.e("ussd", "Success with response : $response \n request $request")
            }

            override fun onReceiveUssdResponseFailed(telephonyManager: TelephonyManager, request: String, failureCode: Int) {
                super.onReceiveUssdResponseFailed(telephonyManager, request, failureCode) // what if i remove this line
                EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "Failed with code $failureCode"))
                textview_log.text = "failed with code " + Integer.toString(failureCode) + "\n request " + request
                Log.e("ussd", "failed with code " + Integer.toString(failureCode) + "\n request " + request)
            }
        }
        EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "Starting ... "))
        try {
            //check for available sims on usr phone
            val sims = SubscriptionManager.from(this).activeSubscriptionInfoList
            if (sims == null) {
                // no sim card is available
                EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "No SIM card detected"))
            }
            
            if (sims != null) {
                for (subInfo in sims) {
                    val slotIndex = subInfo.simSlotIndex
                    // for sim 1 - slot index is 0
                    if (simSlot == slotIndex && simSlot == 0) {
                        EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "Requesting for SIM 1..."))
                        val subscriptionForSlot = subInfo.subscriptionId
                        Log.e("TAG", "sim subscription id $subscriptionForSlot")
                        val telephonyManager = manager.createForSubscriptionId(subscriptionForSlot)
                        textview_log.text = "Requesting ... ..." + telephonyManager.networkOperatorName
                        try {
//                            EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "Sending USSD"))
                            telephonyManager.sendUssdRequest(ussd, callback, handler)
                            Log.e("ussd", "sending ussd successful")
                        } catch (e: SecurityException) {
                            EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "Permission denied "))
                            e.printStackTrace()
                        }

                    }
                    // for sim 2 slot index is 1
                    else if (simSlot == slotIndex && simSlot == 1) {
//                        EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "Requesting for SIM 12 ..."))
                        val subscriptionForSlot = subInfo.subscriptionId
                        Log.e("TAG", "sim subscription id $subscriptionForSlot")

                        val telephonyManager = manager.createForSubscriptionId(subscriptionForSlot)
                        textview_log.text = "Requesting ... ..." + telephonyManager.networkOperatorName
                        try {
                            EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "Sending USSD"))
                            telephonyManager.sendUssdRequest(ussd, callback, handler)
                            Log.e("ussd", "sending ussd successful")
                        } catch (e: SecurityException) {
                            EventBus.getDefault().post(IntentResult(Activity.RESULT_OK, "Permission denied "))
                            e.printStackTrace()
                        }

                    }
                }
            }

        } catch (e: SecurityException) {
            EventBus.getDefault().post(IntentResult(Activity.RESULT_OK,
                    "Permission failed"))
            Log.e("ussd", "permission failed")
            e.printStackTrace()
        }


    }