Trigger receipt printing

The aim of this document is to assist you in triggering receipt printing from your custom application running on the Nomba Android terminal. If you encounter any difficulties with this process, feel free to reach out for support.

Trigger receipt printing - available since NombaX Application v1.6.2

Please note the the Nomba Pro terminals do not come with a built-in printer, but they can be connected to any Bluetooth printer. To establish a Bluetooth connection, you need to grant the permissions ACCESS_FINE_LOCATION_PERMISSION and ACCESS_COARSE_LOCATION_PERMISSION. Please make sure to grant these permissions before testing on the Nomba Pro. Currently, the NombaX application parses an Arraylist of HashMaps to print receipts. The HashMap is to be structured as follows

Structure your data

Currently, the NombaX application parses an Arraylist of HashMaps to print receipts. The HashMap is to be structured as follows

import android.content.Context
import android.graphics.Bitmap
import android.os.Bundle
import android.util.Log
import androidx.annotation.DrawableRes
import androidx.core.content.ContextCompat
import androidx.core.graphics.drawable.toBitmap

// Constants
const val ARGS_PRINT_DATA = "args_print_data"
const val ARGS_PRINT_BITMAP_DATA = "args_print_bitmap_data"

fun main() {
    // For Image/Icon (i.e, Logo)
    val logoMap: HashMap<String, Any> = hashMapOf()
    logoMap["content"] = "imageBitmap"
    logoMap["contentType"] = "IMAGE"
    logoMap["alignment"] = "CENTER | LEFT | RIGHT"

    val textMap: HashMap<String, Any> = hashMapOf()
    // For Text
    textMap["content"] = "text"
    textMap["contentType"] = "TEXT"
    textMap["alignment"] = "CENTER | LEFT | RIGHT"
    textMap["fontSize"] = "NORMAL | LARGE | SMALL | BIG | BIG2 | BIG3 | BIG4 | BIG5 | BIG6 | TALL | WIDE"
    textMap["isBold"] = true // or false

    // Create an ArrayList of the above maps
    val dataList = ArrayList<HashMap<*, *>>()

    // Add the maps to the ArrayList
    dataList.add(logoMap)
    dataList.add(textMap)

    // Create a bundle to be packaged with the intent
    val bundle = Bundle()

    // Pass the ArrayList to the intent
    bundle.putSerializable(ARGS_PRINT_DATA, dataList)

    // Convert drawable of your logo to bitmap
    val bitmap = convertDrawableResToBitmap(context, R.drawable.nombalogo)

    // Pass the bitmap to the intent
    bundle.putParcelable(ARGS_PRINT_BITMAP_DATA, bitmap)
}

// Convert drawable resource to bitmap
fun convertDrawableResToBitmap(context: Context, @DrawableRes drawableRes: Int): Bitmap? {
    return ContextCompat.getDrawable(context, drawableRes)?.toBitmap()
}

Customize the receipt

Please follow the code below to see how to customise the receipt before you release them to be printed out.

import android.content.Context
import android.content.Intent
import android.graphics.Bitmap
import android.os.Bundle
import androidx.activity.result.contract.ActivityResultContracts
import androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult
import androidx.activity.result.ActivityResultLauncher
import androidx.compose.runtime.mutableStateOf
import androidx.core.content.ContextCompat
import androidx.core.graphics.drawable.toBitmap

const val PRINT_REQUEST_CODE = 100
const val ARGS_PRINT_DATA = "ARGS_PRINT_DATA"
const val ARGS_PRINT_BITMAP_DATA = "ARGS_PRINT_BITMAP_DATA"
const val PRINT_RESULT = "PRINT_RESULT"
const val ARGS_PRINT_RECEIPT_EVENT = 1944
const val PRINT_RECEIPT_INTENT = "com.nomba.pro.core.print_receipt.ACTION_VIEW"

val resultString = mutableStateOf("")

//setup a launcher that would help launch the intent
var printReceiptLauncher = registerForActivityResult(
    ActivityResultContracts
        .StartActivityForResult()
) { result ->
    val data: Intent? = result.data
    if (result.resultCode == ARGS_PRINT_RECEIPT_EVENT) {
        resultString.value = data?.getStringExtra(PRINT_RESULT)
    }
}

fun sampleReceipt(): ArrayList<HashMap<*, *>> {
    val dataList = ArrayList<HashMap<*, *>>()

    val imageData: HashMap<String, Any> = hashMapOf()

    imageData["content"] = "imageBitmap"
    imageData["contentType"] = "IMAGE"
    imageData["alignment"] = "CENTER"

    dataList.add(imageData)

    //-----------------------------------------------------------

    val reprintText: HashMap<String, Any> = hashMapOf()

    reprintText["content"] = "REPRINT"
    reprintText["contentType"] = "TEXT"
    reprintText["alignment"] = "CENTER"
    reprintText["fontSize"] = "NORMAL"

    dataList.add(reprintText)

    //-----------------------------------------------------------

    val merchantCopy: HashMap<String, Any> = hashMapOf()

    merchantCopy["content"] = "MERCHANT COPY"
    merchantCopy["contentType"] = "TEXT"
    merchantCopy["alignment"] = "CENTER"
    merchantCopy["fontSize"] = "NORMAL"

    dataList.add(merchantCopy)

    //-----------------------------------------------------------

    val merchantName: HashMap<String, Any> = hashMapOf()

    merchantName["content"] = "MERCHANT NAME: The Horseman"
    merchantName["contentType"] = "TEXT"
    merchantName["alignment"] = "LEFT"
    merchantName["fontSize"] = "NORMAL"

    dataList.add(merchantName)

    //-----------------------------------------------------------

    val terminalId: HashMap<String, Any> = hashMapOf()

    terminalId["content"] = "TERMINAL ID: 2044RMCY"
    terminalId["contentType"] = "TEXT"
    terminalId["alignment"] = "LEFT"
    terminalId["fontSize"] = "NORMAL"

    dataList.add(terminalId)

    //-----------------------------------------------------------

    val txnType: HashMap<String, Any> = hashMapOf()

    txnType["content"] = "CARD PAYMENT"
    txnType["contentType"] = "TEXT"
    txnType["alignment"] = "CENTER"
    txnType["fontSize"] = "LARGE"
    txnType["isBold"] = true

    dataList.add(txnType)

    //-----------------------------------------------------------

    val amount: HashMap<String, Any> = hashMapOf()

    amount["content"] = "AMOUNT: NGN 5000"
    amount["contentType"] = "TEXT"
    amount["alignment"] = "LEFT"
    amount["fontSize"] = "NORMAL"

    dataList.add(amount)

    //-----------------------------------------------------------

    val dateTime: HashMap<String, Any> = hashMapOf()

    dateTime["content"] = "DATE/TIME: 2021-09-09 12:00:00"
    dateTime["contentType"] = "TEXT"
    dateTime["alignment"] = "LEFT"
    dateTime["fontSize"] = "NORMAL"

    dataList.add(dateTime)

    //-----------------------------------------------------------

    val RRN: HashMap<String, Any> = hashMapOf()

    RRN["content"] = "RRN: 1234567890"
    RRN["contentType"] = "TEXT"
    RRN["alignment"] = "LEFT"
    RRN["fontSize"] = "NORMAL"

    dataList.add(RRN)

    //-----------------------------------------------------------

    val stan: HashMap<String, Any> = hashMapOf()

    stan["content"] = "STAN: 423257"
    stan["contentType"] = "TEXT"
    stan["alignment"] = "LEFT"
    stan["fontSize"] = "NORMAL"

    dataList.add(stan)

    //-----------------------------------------------------------

    val cardScheme: HashMap<String, Any> = hashMapOf()

    cardScheme["content"] = "CARD SCHEME: VISA"
    cardScheme["contentType"] = "TEXT"
    cardScheme["alignment"] = "LEFT"
    cardScheme["fontSize"] = "NORMAL"

    dataList.add(cardScheme)

    //-----------------------------------------------------------

    val status: HashMap<String, Any> = hashMapOf()

    status["content"] = "APPROVED"
    status["contentType"] = "TEXT"
    status["alignment"] = "CENTER"
    status["fontSize"] = "LARGE"
    status["isBold"] = true

    dataList.add(status)

    //-----------------------------------------------------------

    val responseCode: HashMap<String, Any> = hashMapOf()

    responseCode["content"] = "RESPONSE CODE: 00"
    responseCode["contentType"] = "TEXT"
    responseCode["alignment"] = "LEFT"
    responseCode["fontSize"] = "NORMAL"

    dataList.add(responseCode)

    //-----------------------------------------------------------

    val meaning: HashMap<String, Any> = hashMapOf()

    meaning["content"] = "MEANING: Approved or successfully completed"
    meaning["contentType"] = "TEXT"
    meaning["alignment"] = "LEFT"
    meaning["fontSize"] = "NORMAL"

    dataList.add(meaning)

    //-----------------------------------------------------------

    val deviceID: HashMap<String, Any> = hashMapOf()

    deviceID["content"] = "DEVICE ID: 2KUD2XFU"
    deviceID["contentType"] = "TEXT"
    deviceID["alignment"] = "LEFT"
    deviceID["fontSize"] = "NORMAL"

    dataList.add(deviceID)

    //-----------------------------------------------------------

    val mobileNumber: HashMap<String, Any> = hashMapOf()

    mobileNumber["content"] = "MOBILE NUMBER: 08012345678"
    mobileNumber["contentType"] = "TEXT"
    mobileNumber["alignment"] = "LEFT"
    mobileNumber["fontSize"] = "NORMAL"

    dataList.add(mobileNumber)

    //-----------------------------------------------------------

    val appVersion: HashMap<String, Any> = hashMapOf()

    appVersion["content"] = "APP VERSION: 1.6.2"
    appVersion["contentType"] = "TEXT"
    appVersion["alignment"] = "LEFT"
    appVersion["fontSize"] = "NORMAL"

    dataList.add(appVersion)

    //-----------------------------------------------------------

    val decoration = HashMap<String, Any>()
    decoration["content"] = "*".repeat(32)
    decoration["contentType"] = "TEXT"
    decoration["alignment"] = "CENTER"

    dataList.add(decoration)

    //-----------------------------------------------------------

    val nombaWebsite = HashMap<String, Any>()
    nombaWebsite["content"] = "www.nomba.com"
    nombaWebsite["contentType"] = "TEXT"
    nombaWebsite["alignment"] = "CENTER"

    dataList.add(nombaWebsite)

    //-----------------------------------------------------------

    dataList.add(decoration)

    //-----------------------------------------------------------

    val whiteSpace = HashMap<String, Any>()
    whiteSpace["content"] = ""
    whiteSpace["contentType"] = "TEXT"
    whiteSpace["alignment"] = "CENTER"

    dataList.add(whiteSpace)

    return dataList
}

fun convertDrawableResToBitmap(context: Context, @DrawableRes drawableRes: Int): Bitmap? {
    return ContextCompat.getDrawable(context, drawableRes)?.toBitmap()
}

val bitmap = convertDrawableResToBitmap(context, R.drawable.nombalogo)

//setup an intent to be triggered
val intent = Intent(PRINT_RECEIPT_INTENT)

//setup a bundle to be packaged with the intent
val bundle = Bundle()

//pass necessary details to bundle
bundle.putSerializable(ARGS_PRINT_DATA, sampleReceipt())
bundle.putParcelable(ARGS_PRINT_BITMAP_DATA, bitmap)

//pass the data bundle to the intent
intent.putExtras(bundle)

//launch the intent
printReceiptLauncher.launch(intent)

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