从 Android 应用程序使用蓝牙热敏打印机打印图像？

Question

我一直在尝试打印图像，但到目前为止我还没有成功。

打印机是本地制造的 2 英寸热敏打印机，打印分辨率为 8 点/毫米, 384dots/line, 203 dpi。
该打印机基于一块板卡，该板具有“NXP 2388 ARM v7 Microproc”，内存 FLASH 大小为 512 KB，RAM：128 KB，接收缓冲区大小为 16KB。

我一直关注this question。

问题：我尝试打印的图像是 576x95 res。

图像已打印（有一些错误 LED 亮起并调试蜂鸣器噪音：D），但图像的方向是垂直的，而不是水平打印的；那也是在页面的最左侧，并且图像的顶部被切断了

在这里假设我没有通过一些标志（同时使“数据包”）与我拥有的打印机兼容。

我之前没有从事过蓝牙打印，所以任何帮助都是可观的:)

我现有的主要活动：

public class MainActivity extends Activity 
    {
    // will show the statuses
    TextView myLabel;
    // will enable user to enter any text to be printed
    EditText myTextbox;
    EditText devName;
    public TableLayout tl2; 
    String devid;
    String[] pName;
    String[] LODQTY;
    String[] rte;
    String[] stk;
    String[] oQty;
    String[] oVal;
    String[] fQty;

    BitSet dots;
    int mWidth;
    int mHeight;
    String mStatus;
    String TAG = "TAG";

    public String msg;

    // android built in classes for bluetooth operations
    BluetoothAdapter mBluetoothAdapter;
    BluetoothSocket mmSocket;
    BluetoothDevice mmDevice;

    OutputStream mmOutputStream;
    InputStream mmInputStream;
    Thread workerThread;

    byte[] readBuffer;
    int readBufferPosition;
    int counter;
    volatile boolean stopWorker;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        devName = (EditText) findViewById(R.id.etdevice);

        devName.setText("BTprinter0377");

        String[] product_info = new String[6];
        product_info[0] = "CPL400^10^1^0^4^0.4^0";
        product_info[1] = "CPL400^10^1^0^4^0.4^0";
        product_info[2] = "CPL400^10^1^0^4^0.4^0";
        product_info[3] = "CPL400^10^1^0^4^0.4^0";
        product_info[4] = "CPL400^10^1^0^4^0.4^0";
        product_info[5] = "CPL400^10^1^0^4^0.4^0";


        tl2 = (TableLayout) findViewById(R.id.dynSummary);
        LayoutInflater inflater = getLayoutInflater();
    for (int current = 0; current <= (product_info.length - 1); current++) {


            final TableRow row = (TableRow)inflater.inflate(R.layout.table_summary_row, tl2 , false);

            TextView tv1 = (TextView)row.findViewById(R.id.tvSkuName);
            TextView tv2 = (TextView)row.findViewById(R.id.tvOrderQty);
            TextView tv3 = (TextView)row.findViewById(R.id.tvFreeQty);

            TextView tv4 = (TextView)row.findViewById(R.id.tvSampleQty);
            TextView tv5 = (TextView)row.findViewById(R.id.tvTotalOrderKg);
            TextView tv6 = (TextView)row.findViewById(R.id.tvTotalFreeKg);
           TextView tv7 = (TextView)row.findViewById(R.id.tvTotalSampleKg);

            StringTokenizer tokens = new StringTokenizer(String.valueOf(product_info[current]), "^");
            //System.out.println("tokens.nextToken().trim()"+tokens.nextToken().trim());
            tv1.setText(tokens.nextToken().trim());
            tv2.setText(tokens.nextToken().trim());
            tv3.setText(tokens.nextToken().trim());
            tv4.setText(tokens.nextToken().trim());
            tv5.setText(tokens.nextToken().trim());
            tv6.setText(tokens.nextToken().trim());
            tv7.setText(tokens.nextToken().trim());

            tl2.addView(row);

    }

        try {

            // we have three buttons for specific functions
            Button openButton = (Button) findViewById(R.id.open);
            Button sendButton = (Button) findViewById(R.id.send);
            Button closeButton = (Button) findViewById(R.id.close);

            myLabel = (TextView) findViewById(R.id.label);

            // open bluetooth connection
            openButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {

                    devid = devName.getText().toString().trim();

                    try {
                        findBT();
                        openBT();
                    } catch (IOException ex) {
                    }

                }
            });

            // send data typed by the user to be printed
            sendButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    try {
                        sendData();
                    } catch (IOException ex) {
                    }
                }
            });

            // close bluetooth connection
            closeButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    try {
                        closeBT();
                    } catch (IOException ex) {
                    }
                }
            });

        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /*
     * This will find a bluetooth printer device
     */
    void findBT() {

        try {
            mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

            if (mBluetoothAdapter == null) {
                myLabel.setText("No bluetooth adapter available");
            }

            if (!mBluetoothAdapter.isEnabled()) {
                Intent enableBluetooth = new Intent(
                        BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableBluetooth, 0);
            }

            Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
                    .getBondedDevices();
            if (pairedDevices.size() > 0) {
                for (BluetoothDevice device : pairedDevices) {

                System.out.println("device.getName(): "+device.getName().toString());

                    if (device.getName().equals("BTprinter0377")) {
                        mmDevice = device;
                        break;
                    }
                }
            }
            myLabel.setText("Bluetooth Device Found");
        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /*
     * Tries to open a connection to the bluetooth printer device
     */
    void openBT() throws IOException {
        try {
            // Standard SerialPortService ID
            UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); 

            mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
            mmSocket.connect();
            mmOutputStream = mmSocket.getOutputStream();
            mmInputStream = mmSocket.getInputStream();

            beginListenForData();

            myLabel.setText("Bluetooth Opened");
        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /*
     * After opening a connection to bluetooth printer device, 
     * we have to listen and check if a data were sent to be printed.
     */
    void beginListenForData() {
        try {
            final Handler handler = new Handler();

            // This is the ASCII code for a newline character
            final byte delimiter = 10;

            stopWorker = false;
            readBufferPosition = 0;
            readBuffer = new byte[1024];

            workerThread = new Thread(new Runnable() {
                public void run() {
                    while (!Thread.currentThread().isInterrupted()
                            && !stopWorker) {

                        try {

                            int bytesAvailable = mmInputStream.available();
                            if (bytesAvailable > 0) {
                                byte[] packetBytes = new byte[bytesAvailable];
                                mmInputStream.read(packetBytes);
                                for (int i = 0; i < bytesAvailable; i++) {
                                    byte b = packetBytes[i];
                                    if (b == delimiter) {
                                        byte[] encodedBytes = new byte[readBufferPosition];
                                        System.arraycopy(readBuffer, 0,
                                                encodedBytes, 0,
                                                encodedBytes.length);
                                        final String data = new String(
                                                encodedBytes, "US-ASCII");
                                        readBufferPosition = 0;

                                        handler.post(new Runnable() {
                                            public void run() {
                                                myLabel.setText(data);
                                            }
                                        });
                                    } else {
                                        readBuffer[readBufferPosition++] = b;
                                    }
                                }
                            }

                        } catch (IOException ex) {
                            stopWorker = true;
                        }

                    }
                }
            });

            workerThread.start();
        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /*
     * This will send data to be printed by the bluetooth printer
     */
    void sendData() throws IOException {
        System.out.println("tl2.getChildCount(): "+tl2.getChildCount());
        try {

            print_image("/sdcard/tryimg.png");

            String msg22;
            msg22 = "\n";
            msg22 += "PN     Or Fr Sa TOKg TFKg TSKg";
            msg22 += "\n";

            //mmOutputStream.write(msg22.getBytes());

            // tell the user data were sent
            myLabel.setText("Data Sent");

        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /*
     * Close the connection to bluetooth printer.
     */
    void closeBT() throws IOException {
        try {
            stopWorker = true;
            mmOutputStream.close();
            mmInputStream.close();
            mmSocket.close();
            myLabel.setText("Bluetooth Closed");
        } catch (NullPointerException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    public String convertBitmap(Bitmap inputBitmap) {

        mWidth = inputBitmap.getWidth();
        mHeight = inputBitmap.getHeight();

        convertArgbToGrayscale(inputBitmap, mWidth, mHeight);
        mStatus = "ok";
        return mStatus;

    }

    private void convertArgbToGrayscale(Bitmap bmpOriginal, int width,
            int height) {
        int pixel;
        int k = 0;
        int B = 0, G = 0, R = 0;
         dots = new BitSet();
        try {

            for (int x = 0; x < height; x++) {
                for (int y = 0; y < width; y++) {
                    // get one pixel color
                    pixel = bmpOriginal.getPixel(y, x);

                    // retrieve color of all channels
                    R = Color.red(pixel);
                    G = Color.green(pixel);
                    B = Color.blue(pixel);
                    // take conversion up to one single value by calculating
                    // pixel intensity.
                    R = G = B = (int) (0.299 * R + 0.587 * G + 0.114 * B);
                    // set bit into bitset, by calculating the pixel's luma
                    if (R < 55) {                       
                        dots.set(k);//this is the bitset that i'm printing
                    }
                    k++;

                }


            }


        } catch (Exception e) {
            // TODO: handle exception
            Log.e(TAG, e.toString());
        }
    }


    private void print_image(String file) throws IOException {
        File fl = new File(file);
        if (fl.exists()) {
            Bitmap bmp = BitmapFactory.decodeFile(file);
            convertBitmap(bmp);
            mmOutputStream.write(PrinterCommands.SET_LINE_SPACING_24);

            int offset = 0;
            while (offset < bmp.getHeight()) {
                mmOutputStream.write(PrinterCommands.SELECT_BIT_IMAGE_MODE);
                for (int x = 0; x < bmp.getWidth(); ++x) {

                    for (int k = 0; k < 3; ++k) {

                        byte slice = 0;
                        for (int b = 0; b < 8; ++b) {
                            int y = (((offset / 8) + k) * 8) + b;
                            int i = (y * bmp.getWidth()) + x;
                            boolean v = false;
                            if (i < dots.length()) {
                                v = dots.get(i);
                            }
                            slice |= (byte) ((v ? 1 : 0) << (7 - b));
                        }
                        mmOutputStream.write(slice);
                    }
                }
                offset += 24;
                mmOutputStream.write(PrinterCommands.FEED_LINE);
                mmOutputStream.write(PrinterCommands.FEED_LINE);          
                mmOutputStream.write(PrinterCommands.FEED_LINE);
                mmOutputStream.write(PrinterCommands.FEED_LINE);
                mmOutputStream.write(PrinterCommands.FEED_LINE);
                mmOutputStream.write(PrinterCommands.FEED_LINE);
            }
            mmOutputStream.write(PrinterCommands.SET_LINE_SPACING_30);


        } else {
            Toast.makeText(this, "file doesn't exists", Toast.LENGTH_SHORT).show();
        }
    }

}

PrinterCommands 类：

public class PrinterCommands {
public static final byte[] INIT = {27, 64};
public static byte[] FEED_LINE = {10};

public static byte[] SELECT_FONT_A = {27, 33, 0};

public static byte[] SET_BAR_CODE_HEIGHT = {29, 104, 100};
public static byte[] PRINT_BAR_CODE_1 = {29, 107, 2};
public static byte[] SEND_NULL_BYTE = {0x00};

public static byte[] SELECT_PRINT_SHEET = {0x1B, 0x63, 0x30, 0x02};
public static byte[] FEED_PAPER_AND_CUT = {0x1D, 0x56, 66, 0x00};

public static byte[] SELECT_CYRILLIC_CHARACTER_CODE_TABLE = {0x1B, 0x74, 0x11};

public static byte[] SELECT_BIT_IMAGE_MODE = {0x1B, 0x2A, 33, (byte) 255, 3};
//public static byte[] SELECT_BIT_IMAGE_MODE = {0x1B, 0x2A, 0x64, 0x63, 48, (byte) 255};

public static byte[] SET_LINE_SPACING_24 = {0x1B, 0x33, 24};
public static byte[] SET_LINE_SPACING_30 = {0x1B, 0x33, 30};

public static byte[] TRANSMIT_DLE_PRINTER_STATUS = {0x10, 0x04, 0x01};
public static byte[] TRANSMIT_DLE_OFFLINE_PRINTER_STATUS = {0x10, 0x04, 0x02};
public static byte[] TRANSMIT_DLE_ERROR_STATUS = {0x10, 0x04, 0x03};
public static byte[] TRANSMIT_DLE_ROLL_PAPER_SENSOR_STATUS = {0x10, 0x04, 0x04};
}

如打印机开发手册（pdf）中所述：

Bit Map Image Print
1. Select the image either from PC or from mobile's SD card.
2. Convert the image into monochrome bmp.
3. Resize the image to fit into the printer paper area if it is exceeding
4. Now read the processed image through fileinputstream and save it into byte array.
5. Make the packet of image and then send it to printer over outputstream.

所需的数据包结构：

数据包字段图表：

对齐表和其他信息：

Answer 1

private byte[] printbyte = {(byte)0x1B,(byte)0x2A,(byte)0x6F,(byte)0x63} 

File file = new File(Environment.getExternalStorageDirectory + File.seprator()+"file_name");
FileInputStream fin = new FileInputStream(file);
byte imageContent[] = new byte[(int)file.length()];
fin.read(imageContent);

byte [] width  = hexToBuffer(Integer.toHexString(your_width));
byte [] height = hexToBuffer(Integer.toHexString(your_height));

byte[] imageToPrint = new byte[printbyte.lenght()+imageContent.lenght()+width.lenght()+height.lenght()];

  System.arraycopy(imagetoprint,0,printbyte,0,printbyte.lenght());
  System.arraycopy(imagetoprint,printbyte.lenght(),width ,0,width.lenght());
  System.arraycopy(imagetoprint,width.lenght(),height,0,height.lenght());  
  System.arraycopy(imagetoprint,height.lenght(),imageContent,0,imageContent.lenght()); 

  mmOutputStream.write(imagetoprint);  

十六进制转缓冲区方法-

public static byte[] hexToBuffer(String hexString)
    throws NumberFormatException {
    int length = hexString.length();
    byte[] buffer = new byte[(length + 1) / 2];
    boolean evenByte = true;
    byte nextByte = 0;
    int bufferOffset = 0;

    if ((length % 2) == 1) {
        evenByte = false;
    }

    for (int i = 0; i < length; i++) {
        char c = hexString.charAt(i);
        int nibble; // A "nibble" is 4 bits: a decimal 0..15

        if ((c >= '0') && (c <= '9')) {
            nibble = c - '0';
        } else if ((c >= 'A') && (c <= 'F')) {
            nibble = c - 'A' + 0x0A;
        } else if ((c >= 'a') && (c <= 'f')) {
            nibble = c - 'a' + 0x0A;
        } else {
            throw new NumberFormatException("Invalid hex digit '" + c +
                "'.");
        }

        if (evenByte) {
            nextByte = (byte) (nibble << 4);
        } else {
            nextByte += (byte) nibble;
            buffer[bufferOffset++] = nextByte;
        }

        evenByte = !evenByte;
    }

    return buffer;
}

Answer 2

我有一台带蓝牙和 USB 连接的热敏打印机，如果您的打印机支持 ESC/POS 命令，请在互联网上搜索其命令， 对于打印光栅图像，你应该发送这个：

[Name] Print raster bit image
[Format] ASCII GS v 0 m xL xH yL yH d1...dk
         Hex 1D 76 30 m xL xH yL yH d1...dk
         Decimal 29 118 48 m xL xH yL yH d1...dk
[Range] 0£ m£ 3, 48£ m £ 51
0£ xL£ 255
0£ xH£ 255
0£ yL£ 255
0£ d£ 255
k=(xL+ xH*256)*(yL+yH*256)

遵循您的打印机指南，它可能与其他指南不同。