Question

In my project i have to read barcodes using barcode scanner Symbol CS3070 through bluetooth. i.e; i have to establish a connection between android device and barcode scanner through bluetooth. Can any one tell me how to read values from barcode reader and how to setup for communication? I’ve already read the Bluetooth Developer Guide, and I don’t want to use Barcode Reader in Bluetooth Keyboard Emulation (HID) mode (I’ve some textview that can be filled using soft keyboard and Barcode Reader and I can’t control the focus)

I’d use a thread like this to communicate with a reader

    private class BarcodeReaderThread extends Thread {
    private final BluetoothServerSocket mmServerSocket;

    public BarcodeReaderThread(UUID UUID_BLUETOOTH) {
        // Use a temporary object that is later assigned to mmServerSocket,
        // because mmServerSocket is final
        BluetoothServerSocket tmp = null;
        try {
            // MY_UUID is the app's UUID string, also used by the client code
            tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord("BarcodeScannerForSGST", UUID_BLUETOOTH);
            /*
             * The UUID is also included in the SDP entry and will be the basis for the connection
             * agreement with the client device. That is, when the client attempts to connect with this device,
             * it will carry a UUID that uniquely identifies the service with which it wants to connect.
             * These UUIDs must match in order for the connection to be accepted (in the next step)
             */
        } catch (IOException e) { }
        mmServerSocket = tmp;
    }

    public void run() {
        BluetoothSocket socket = null;
        // Keep listening until exception occurs or a socket is returned
        while (true) {
            try {
                socket = mmServerSocket.accept();
                try {
                    // If a connection was accepted
                    if (socket != null) {
                        // Do work to manage the connection (in a separate thread)
                        InputStream mmInStream = null;

                        // Get the input and output streams, using temp objects because
                        // member streams are final
                        mmInStream = socket.getInputStream();

                        byte[] buffer = new byte[1024];  // buffer store for the stream
                        int bytes; // bytes returned from read()

                        // Keep listening to the InputStream until an exception occurs
                        // Read from the InputStream
                        bytes = mmInStream.read(buffer);
                        if (bytes > 0) {
                            // Send the obtained bytes to the UI activity
                            String readMessage = new String(buffer, 0, bytes);
                            //doMainUIOp(BARCODE_READ, readMessage);
                            if (readMessage.length() > 0 && !etMlfb.isEnabled()) //Se sono nella parte di picking
                                new ServerWorker().execute(new Object[] {LEGGI_SPED, readMessage});
                        }
                        socket.close();
                    }
                }
                catch (Exception ex) { } 
            } catch (IOException e) {
                break;
            }
        }
    }

    /** 
     * Will cancel the listening socket, and cause the thread to finish
     */
    public void cancel() {
        try {
            mmServerSocket.close();
        } catch (IOException e) { }
    }
}

Thanks

Answer 1

I just received my device and when I paired and connected the device it automatically sends the data to the currently focused EditText. What version of Android are you using because I tried it on ICS and JB and it worked this way.
I have not tested it in any earlier versions.

Edit:

I downgraded my phone to Gingerbread and found out it does not work the same way but I have a solution:

This is important! >> First you must scan the barcode in the manual that says “Serial Port Profile (SPP)”.

btAdapter = BluetoothAdapter.getDefaultAdapter();
if (btAdapter.isEnabled())
{
    new BluetoothConnect().execute("");
}

public class BluetoothConnect extends AsyncTask<String, String, Void>
{
    public static String MY_UUID = "00001101-0000-1000-8000-00805F9B34FB";

    @Override
    protected Void doInBackground(String... params)
    {
        String address = DB.GetOption("bluetoothAddress");
        BluetoothDevice device = btAdapter.getRemoteDevice(address);
        try
        {
            socket = device.createRfcommSocketToServiceRecord(UUID.fromString(MY_UUID));
            btAdapter.cancelDiscovery();
            socket.connect();
            InputStream stream = socket.getInputStream();
            int read = 0;
            byte[] buffer = new byte[128];
            do
            {
                try
                {
                    read = stream.read(buffer);
                    String data = new String(buffer, 0, read);
                    publishProgress(data);
                }
                catch(Exception ex)
                {
                    read = -1;
                }
            }
            while (read > 0);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onProgressUpdate(String... values)
    {
        if (values[0].equals("\r"))
        {
            addToList(input.getText().toString());
            pickupInput.setText("");
        }
        else input.setText(values[0]);
        super.onProgressUpdate(values);
    }
}

This is an incomplete version of my working code but you should get the gist.
I hope this solution works for you as well!