I am creating an android application that consists of printing data from printer connected via usb. Here, I want to set page layouts such as new line printing when reached at the end of page and page borders etc. Is it possible via programatically. Please help me how to do this.
This is what i had done for printing for data:
public class DemoPrinter extends Activity {
private final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
Button create_file;
PendingIntent mPermissionIntent;
UsbManager usbManager;
UsbDevice device;
EditText print_text;
UsbDevice printer = null;
private static final int PRINTER_VENDOR_ID = 1256;
private String filename = "MySampleFile.txt";
private String filepath = "PanelFilesstorage";
File myInternalFile;
String data= "This is a sample text";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
try
{
setContentView(R.layout.activity_demo_printer);
ContextWrapper contextWrapper = new ContextWrapper(getApplicationContext());
File directory = contextWrapper.getDir(filepath, Context.MODE_PRIVATE);
myInternalFile = new File(directory , filename);
print_text = (EditText)findViewById(R.id.editText_printer);
usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
if (deviceList.size() <= 0)
{
Toast.makeText(getApplicationContext(), "Info: No device found", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getApplicationContext(), "No of devices"+deviceList.size(), Toast.LENGTH_SHORT).show();
((TextView) findViewById(R.id.textView_devices))
.setText("No of device : " + deviceList.size());
}
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
int count = 0;
mPermissionIntent = PendingIntent.getBroadcast(getBaseContext(), 0,
new Intent(ACTION_USB_PERMISSION), 0);
while (deviceIterator.hasNext()) {
count++;
device = deviceIterator.next();
Log.i("info", "Device No " + count + "........");
Log.i("info", "Vendor id : " + device.getVendorId());
Log.i("info", "Product id : " + device.getProductId());
Log.i("info", "Device name : " + device.getDeviceName());
Log.i("info", "Device class : " + device.getClass().getName());
Log.i("info", "Device protocol: " + device.getDeviceProtocol());
Log.i("info", "Device subclass : " + device.getDeviceSubclass());
if (device.getVendorId() == PRINTER_VENDOR_ID) {
printer = device;
break;
}
}
findViewById(R.id.button_print).setOnClickListener(
new OnClickListener() {
@Override
public void onClick(View v) {
Log.i("Info", "Print command given");
IntentFilter filter = new IntentFilter(
ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
if (printer != null) {
usbManager.requestPermission(printer,
mPermissionIntent);
} else {
Log.e("Exception", "Printer not found");
}
}
});
} catch (Exception e) {
Log.e("Exception", "Exception in onCreate " + e.getMessage());
e.printStackTrace();
}
findViewById(R.id.button_create_file).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
try
{
FileOutputStream fos = new FileOutputStream(myInternalFile+"\n");
fos.write(data.toString().getBytes());
fos.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
});
}
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
try {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action))
{
synchronized (this)
{
final UsbDevice printerDevice = (UsbDevice) intent
.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(
UsbManager.EXTRA_PERMISSION_GRANTED, false))
{
if (printerDevice != null) {
Log.i("Info", "Device permission granted");
startPrinting(printerDevice);
}
}
else
{
Log.d("Debug", "permission denied for device "
+ printerDevice);
}
}
}
} catch (Exception e)
{
Log.e("Exception", "Exception in onRecieve " + e.getMessage());
e.printStackTrace();
}
}
};
public void startPrinting(final UsbDevice printerDevice)
{
new Handler().post(new Runnable()
{
UsbDeviceConnection conn;
UsbInterface usbInterface;
@Override
public void run()
{
try
{
Log.i("Info", "Bulk transfer started");
usbInterface = printerDevice.getInterface(0);
UsbEndpoint endPoint = usbInterface.getEndpoint(0);
conn = usbManager.openDevice(printer);
conn.claimInterface(usbInterface, true);
String myStringData = print_text.getText().toString();
myStringData+="\n";
byte[] array = myStringData.getBytes();
ByteBuffer output_buffer = ByteBuffer
.allocate(array.length);
UsbRequest request = new UsbRequest();
request.initialize(conn, endPoint);
request.queue(output_buffer, array.length);
if (conn.requestWait() == request)
{
Log.i("Info", output_buffer.getChar(0) + "");
Message m = new Message();
m.obj = output_buffer.array();
// handler.sendMessage(m);
output_buffer.clear();
}
else
{
Log.i("Info", "No request recieved");
}
int transfered = conn.bulkTransfer(endPoint,
myStringData.getBytes(),
myStringData.getBytes().length, 5000);
Log.i("Info", "Amount of data transferred : " +transfered);
} catch (Exception e)
{
Log.e("Exception", "Unable to transfer bulk data");
e.printStackTrace();
} finally
{
try
{
conn.releaseInterface(usbInterface);
Log.i("Info", "Interface released");
conn.close();
Log.i("Info", "Usb connection closed");
unregisterReceiver(mUsbReceiver);
Log.i("Info", "Brodcast reciever unregistered");
}
catch (Exception e)
{
Log.e("Exception",
"Unable to release resources because : "
+ e.getMessage());
e.printStackTrace();
}
}
}
});
}
}
