我一直在尝试打印一张图片，但到目前为止我还没有成功。
该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、384 点/行、203 dpi。
打印机基于具有“NXP 2388 ARM v7 Microproc”的板。内存闪存大小为 512 KB, RAM: 128 KB & a Receive Buffer Size of 16KB.
我一直关注这个问题。
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
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工作，所以任何帮助都是显而易见的:)
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();
}
}
}
打印机命令类：
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};
}
如打印机的开发手册（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：
