How to send data to bluetooth printer via android app?
Finally I solved this problem by my self and the problem is that the header byte which I am sending to the printer is the real culprit. Actually I am sending 170,1 (where 170 is the first byte that the printer must receive and the second byte is the printer id I mean some com port which these two values are given by Printer control card designer). Actual I have to send 170,2 where 2 is the Printer Id so that it gives the correct print and for every printer it is common of sending the data based on their control card's.
Thanks a lot friends and here is my code that u can use these code for all types of printers(for POS-Thermal Printers)
public void IntentPrint(String txtvalue)
{
byte[] buffer = txtvalue.getBytes();
byte[] PrintHeader = { (byte) 0xAA, 0x55,2,0 };
PrintHeader[3]=(byte) buffer.length;
InitPrinter();
if(PrintHeader.length>128)
{
value+="\nValue is more than 128 size\n";
txtLogin.setText(value);
}
else
{
try
{
for(int i=0;i<=PrintHeader.length-1;i++)
{
mmOutputStream.write(PrintHeader[i]);
}
for(int i=0;i<=buffer.length-1;i++)
{
mmOutputStream.write(buffer[i]);
}
mmOutputStream.close();
mmSocket.close();
}
catch(Exception ex)
{
value+=ex.toString()+ "\n" +"Excep IntentPrint \n";
txtLogin.setText(value);
}
}
}
And this code for the rest:
public void InitPrinter()
{
try
{
if(!bluetoothAdapter.isEnabled())
{
Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetooth, 0);
}
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
if(pairedDevices.size() > 0)
{
for(BluetoothDevice device : pairedDevices)
{
if(device.getName().equals("Your Device Name")) //Note, you will need to change this to match the name of your device
{
mmDevice = device;
break;
}
}
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
//Method m = mmDevice.getClass().getMethod("createRfcommSocket", new Class[] { int.class });
//mmSocket = (BluetoothSocket) m.invoke(mmDevice, uuid);
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
bluetoothAdapter.cancelDiscovery();
if(mmDevice.getBondState()==2)
{
mmSocket.connect();
mmOutputStream = mmSocket.getOutputStream();
}
else
{
value+="Device not connected";
txtLogin.setText(value);
}
}
else
{
value+="No Devices found";
txtLogin.setText(value);
return;
}
}
catch(Exception ex)
{
value+=ex.toString()+ "\n" +" InitPrinter \n";
txtLogin.setText(value);
}
}
Are you aiming for a specific protocol of printing? (for specific printer?)
If not, and a generic print can be made to whetever printer is connected, you can use this code snippet:
Write this where you want to print a specific file/files:
Intent intent = Tools.getSendToPrinterIntent(
DisplayActivity.this, mPdfAsPictures,
mPrintCurrentIndex);
// notify the activity on return (will need to ask the user for
// approvel)
startActivityForResult(intent, ACTIVITY_PRINT);
This is the helper method:
public static Intent getSendToPrinterIntent(Context ctx, String[] fileFullPaths, int indexToPrint){
Intent sendIntent = new Intent(Intent.ACTION_SEND_MULTIPLE);
// This type means we can send either JPEG, or PNG
sendIntent.setType("image/*");
ArrayList<Uri> uris = new ArrayList<Uri>();
File fileIn = new File(fileFullPaths[indexToPrint]);
Uri u = Uri.fromFile(fileIn);
uris.add(u);
sendIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
return sendIntent;
}
And finally, you'll receive the answer at:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == ACTIVITY_PRINT) {
switch (resultCode) {
case Activity.RESULT_CANCELED:
Log.d(TAG(), "onActivityResult, resultCode = CANCELED");
break;
case Activity.RESULT_FIRST_USER:
Log.d(TAG(), "onActivityResult, resultCode = FIRST_USER");
break;
case Activity.RESULT_OK:
Log.d(TAG(), "onActivityResult, resultCode = OK");
break;
}
}
};
Good luck!