"First, make sure you have imported the sunmiPrinterLibrary.jar lib into your project, then use the PrinterHelper class to interact with the lib."
Purpose:
The PrinterHelper class provides various methods to interact with Sunmi printers. It
handles printer connection, sending print data, checking printer status, and performing
printer-specific actions like cutting paper and printing different types of content.
1-Including the Class: This likely means adding the necessary dependency to your project's build.gradle file. Refer to the library's documentation for the correct dependency information.
2-Instantiating the Class: The provided code snippet PrinterHelper printerHelper = PrinterHelper() creates a new instance of the PrinterHelper class. In Kotlin, you would typically use:
val printerHelper = PrinterHelper()
3-Initializing the Printing Service: The initSunmiPrinterService(this) method likely initializes the connection to the Sunmi printer. The this argument probably refers to the current Activity or Context.
printerHelper.initSunmiPrinterService(this)
Error Handling: It's crucial to add error handling to your code. The initSunmiPrinterService method might throw exceptions if the printer is not connected or there are other issues.
Permissions: Ensure you have the necessary permissions in your AndroidManifest.xml to interact with the printer. Background Tasks: If the printing process is long-running, consider using a background thread or WorkManager to avoid blocking the main thread.
fun initSunmiPrinterService(context: Context?)
*Purpose: Initialize the Sunmi printer service and bind it to the provided context.
*Parameters:
context: Context?: The context to which the printer service should be bound.
Return: None
*Exceptions:
InnerPrinterException: Conditions under which this exception is raised.
fun deInitSunmiPrinterService(context: Context?)
*Purpose: Unbind the Sunmi printer service from the provided context.
*Parameters:
context: Context?: The context from which the printer service should be unbound.
Return: None
*Exceptions:
InnerPrinterException: Conditions under which this exception is raised.
private fun checkSunmiPrinterService(service: SunmiPrinterService)
*Purpose: Check the Sunmi printer service to determine if a printer is available.
*Parameters:
service: SunmiPrinterService: The printer service to be checked.
Return: None
*Exceptions:
InnerPrinterException: Conditions under which this exception is raised.
private fun handleRemoteException(e: RemoteException)
*Purpose: Handle RemoteException when interacting with the Sunmi printer service.
*Parameters:
e: RemoteException: The exception to be handled.
Return: None
*Exceptions:
None
fun sendRawData(data: ByteArray?)
*Purpose: Send raw data to the printer for printing.
*Parameters:
data: ByteArray?: The raw data to be sent to the printer.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun cutpaper()
*Purpose: Cut the paper using the printer's cutter.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun initPrinter()
*Purpose: Initialize the printer.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun print3Line()
*Purpose: Print three lines using the printer.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun getPrinterSerialNo(): String?
*Purpose: Get the serial number of the printer.
*Parameters:
None
Return: The serial number of the printer as a String.
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun getDeviceModel(): String?
*Purpose: Get the model of the printer.
*Parameters:
None
Return: The model of the printer as a String.
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun getPrinterVersion(): String?
*Purpose: Get the version of the printer.
*Parameters:
None
Return: The version of the printer as a String.
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun getPrinterPaper(): String?
*Purpose: Get the type of paper used in the printer.
*Parameters:
None
Return: The type of paper as a String.
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun getPrinterStatus(): String
*Purpose: Get the current status of the printer.
*Parameters:
None
Return: The status of the printer as a String.
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun getPrinterHead(callbcak: InnerResultCallback?)
*Purpose: Get the printer head information.
*Parameters:
callback: InnerResultCallback?: The callback to receive the result.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun getPrinterDistance(callback: InnerResultCallback?)
*Purpose: Get the printed distance of the printer.
*Parameters:
callback: InnerResultCallback?: The callback to receive the result.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun setAlign(align: Int)
*Purpose: Set the alignment for the printer.
*Parameters:
align: Int: The alignment to be set.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun feedPaper()
*Purpose: Feed paper using the printer.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun printText(content: String?, size: Float, isBold: Boolean, isUnderLine: Boolean, typeface: String?)
*Purpose: Print text with specified style and size.
*Parameters:
content: String?: The text content to be printed.
size: Float: The size of the text.
isBold: Boolean: Whether the text should be bold.
isUnderLine: Boolean: Whether the text should be underlined.
typeface: String?: The typeface to be used.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun printBarCode(data: String?, symbology: Int, height: Int, width: Int, textposition: Int)
*Purpose: Print a barcode with specified parameters.
*Parameters:
data: String?: The data to be encoded in the barcode.
symbology: Int: The barcode symbology.
height: Int: The height of the barcode.
width: Int: The width of the barcode.
textposition: Int: The position of the text.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun printQr(data: String?, modulesize: Int, errorlevel: Int)
*Purpose: Print a QR code with specified parameters.
*Parameters:
data: String?: The data to be encoded in the QR code.
modulesize: Int: The module size of the QR code.
errorlevel: Int: The error level of the QR code.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun printTable(txts: Array<String?>?, width: IntArray?, align: IntArray?)
*Purpose: Print a table with specified text, width, and alignment.
*Parameters:
txts: Array<String?>?: The text to be printed in each cell.
width: IntArray?: The width of each column.
align: IntArray?: The alignment of each column.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun printBitmap(bitmap: Bitmap?, orientation: Int)
*Purpose: Print a bitmap image with specified orientation.
*Parameters:
bitmap: Bitmap?: The bitmap to be printed.
orientation: Int: The orientation of the bitmap.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun isBlackLabelMode(): Boolean
*Purpose: Check if the printer is in black label mode.
*Parameters:
None
Return: Boolean indicating if the printer is in black label mode.
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun isLabelMode(): Boolean
*Purpose: Check if the printer is in label mode.
*Parameters:
None
Return: Boolean indicating if the printer is in label mode.
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun openCashBox()
*Purpose: Open the cash box connected to the printer.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun controlLcd(flag: Int)
*Purpose: Control the LCD of the printer with specified flag.
*Parameters:
flag: Int: The control flag for the LCD.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun sendTextToLcd()
*Purpose: Send text to the LCD of the printer.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun sendTextsToLcd()
*Purpose: Send multiple texts to the LCD of the printer.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun sendPicToLcd(pic: Bitmap?)
*Purpose: Send a picture to the LCD of the printer.
*Parameters:
pic: Bitmap?: The picture to be sent to the LCD.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun showPrinterStatus(context: Context?)
*Purpose: Show the status of the printer as a toast message.
*Parameters:
context: Context?: The context in which the toast message should be shown.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun printOneLabel()
*Purpose: Print a single label.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
fun printMultiLabel(num: Int)
*Purpose: Print multiple labels.
*Parameters:
num: Int: The number of labels to be printed.
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
@Throws(RemoteException::class)
private fun printLabelContent()
*Purpose: Print the content of a label.
*Parameters:
None
Return: None
*Exceptions:
RemoteException: Conditions under which this exception is raised.
class CanvasActivity : AppCompatActivity() {
private lateinit var drawingView: CustomDrawingView
private lateinit var printerHelper:PrinterHelper
private val imagesToPrint = mutableListOf<Bitmap>()
companion object {
private const val REQUEST_CODE_PICK_IMAGE = 100
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.canvas)
SystemBarsUtils.styleSystemBars(this, android.R.color.black)
drawingView = findViewById(R.id.drawingView)
val btnPrintCanvas = findViewById<Button>(R.id.btnPrintCanvas)
val btnBack = findViewById<Button>(R.id.btnBack)
val btnBitmap = findViewById<Button>(R.id.btnBitmap)
printerHelper = PrinterHelper()
printerHelper.initSunmiPrinterService(this)
btnPrintCanvas.setOnClickListener {
val bitmap = drawingView.getBitmap()
printerHelper.printBitmap(bitmap, 0)
}
btnBack.setOnClickListener {
startActivity(Intent(this, PrinterManager::class.java))
finish()
}
btnBitmap.setOnClickListener {
imagesToPrint.clear()
val intent = Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
startActivityForResult(intent, REQUEST_CODE_PICK_IMAGE)
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == REQUEST_CODE_PICK_IMAGE && resultCode == RESULT_OK) {
data?.let {
if(it.clipData != null) {
val clipData = it.clipData!!
for (i in 0 until clipData.itemCount) {
val item = clipData.getItemAt(i)
val selectedImageUri = item.uri
addImageToQueue(selectedImageUri)
}
} else if (it.data != null) {
val selectedImageUri = it.data!!
addImageToQueue(selectedImageUri)
}
printImageQueue()
}
}
}
private fun addImageToQueue(selectedImageUri: Uri) {
try {
val bitmap = MediaStore.Images.Media.getBitmap(contentResolver, selectedImageUri)
imagesToPrint.add(bitmap)
} catch (e: IOException) {
e.printStackTrace()
Toast.makeText(this, "Failed to load image", Toast.LENGTH_SHORT).show()
}
}
private fun printImageQueue() {
imagesToPrint.forEach { bitmap ->
printerHelper.printBitmap(bitmap, 0)
}
imagesToPrint.clear()
Toast.makeText(this, "Print queue completed", Toast.LENGTH_SHORT).show()
}
override fun onDestroy() {
super.onDestroy()
printerHelper.deInitSunmiPrinterService(this)
}
}
- Methods handling
RemoteExceptioncatch the exception and pass it to thehandleRemoteExceptionmethod for processing. InnerPrinterExceptionis caught and logged.
- The class contains several
TODOcomments indicating areas where further processing or handling is required, particularly in the event of service disconnection or exception handling. - This class should be used with a valid context and proper error handling in a production environment to ensure smooth printer operations.