前言

最近有个需求就是在rk3399上通过usb口打印发票单，各大品牌的针式打印机几乎都没有Android平台的SDK，后查找相关材料发现，可通过ESC/P指令利用usb口通信进行打印。

正文

1.注册usb服务，打开usb通信，网上相关资料很多，这边简单列举一下，注意配置usb权限

private void init(Context context) {mContext = context;mUsbManager = (UsbManager) mContext.getSystemService(Context.USB_SERVICE);mPermissionIntent = PendingIntent.getBroadcast(mContext, 0, new Intent(ACTION_USB_PERMISSION), 0);IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);mContext.registerReceiver(mUsbDeviceReceiver, filter);// 列出所有的USB设备，并且都请求获取USB权限HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();for (UsbDevice device : deviceList.values()) {usbInterface = device.getInterface(0);if (usbInterface.getInterfaceClass() == UsbConstants.USB_CLASS_PRINTER) {Log.d("device", device.getProductName() + "     " + device.getManufacturerName());Log.d("device", device.getVendorId() + "     " + device.getProductId() + "      " + device.getDeviceId());Log.d("device", usbInterface.getInterfaceClass() + "");if (!mUsbManager.hasPermission(device)) {mUsbManager.requestPermission(device, mPermissionIntent);}else {connectUsbPrinter(device);}}}
}private final BroadcastReceiver mUsbDeviceReceiver = new BroadcastReceiver() {public void onReceive(Context context, Intent intent) {String action = intent.getAction();UsbDevice mUsbDevice = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);if (ACTION_USB_PERMISSION.equals(action)) {synchronized (this) {if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false) && mUsbDevice != null) {connectUsbPrinter(mUsbDevice);} else {ToastUtil.showShort(mContext,"USB设备请求被拒绝");}}} else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {if (mUsbDevice != null) {ToastUtil.showShort(mContext, "有设备拔出");}} else if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {if (mUsbDevice != null) {usbInterface = mUsbDevice.getInterface(0);if(usbInterface.getInterfaceClass() == UsbConstants.USB_CLASS_PRINTER){ToastUtil.showShort(mContext, "有打印机设备插入");if (!mUsbManager.hasPermission(mUsbDevice)) {mUsbManager.requestPermission(mUsbDevice, mPermissionIntent);}else {connectUsbPrinter(mUsbDevice);}}}}}};private void connectUsbPrinter(UsbDevice mUsbDevice) {if (mUsbDevice != null) {for (int i = 0; i < usbInterface.getEndpointCount(); i++) {ep = usbInterface.getEndpoint(i);if (ep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {if (ep.getDirection() == UsbConstants.USB_DIR_OUT) {mUsbDeviceConnection = mUsbManager.openDevice(mUsbDevice);printerEp = ep;if (mUsbDeviceConnection != null) {ToastUtil.showShort(mContext, "设备已连接");mUsbDeviceConnection.claimInterface(usbInterface, true);mUsbDeviceConnection.releaseInterface(usbInterface);}}}}} else {ToastUtil.showShort(mContext, "未发现可用的打印机");}
}

2.USB输出ESC/P指令

private static final byte[] RESET = {27, '@'};
// 纸张大小设置-定义单位
private static final byte[] PAPER_UNIT = {27, 40, 85, 1, 0, 60};
// 纸张大小设置-页长-按照定义单位设置页长
private static final byte[] PAPER_LENGHT_1 = {27, 40, 67, 2, 0, 100, 01};
//退纸
private static final byte[]OUT = {0x0c};
//结束初始化
private byte[] over = new byte[]{0x1b, '@',0x0d};private boolean write(byte[] byte1,byte[]... bytes) {if (mUsbDeviceConnection != null) {byte[] newbyte = concat(byte1,bytes);//usb输出byteint b =mUsbDeviceConnection.bulkTransfer(printerEp,newbyte,newbyte.length,TIME_OUT);LogHelper.i("bulkTransfer，b-->" + b);return b>0;} else {ToastUtil.showShort(mContext, "未发现可用的打印机");return false;}}private void printBitmap(Bitmap bmp) throws IOException {bmp = compressPic(bmp);byte[] bmpByteArray = draw2PxPoint(bmp);write(bmpByteArray);
}/**
* 对图片进行压缩（去除透明度）** @param bitmapOrg*/
public static Bitmap compressPic(Bitmap bitmapOrg) {// 获取这个图片的宽和高int width = bitmapOrg.getWidth();int height = bitmapOrg.getHeight();// 定义预转换成的图片的宽度和高度int newWidth = IMAGE_SIZE;int newHeight = IMAGE_SIZE+30;Bitmap targetBmp = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);Canvas targetCanvas = new Canvas(targetBmp);targetCanvas.drawColor(0xffffffff);targetCanvas.drawBitmap(bitmapOrg, new Rect(0, 0, width, height), new Rect(0, 0, newWidth, newHeight), null);return targetBmp;
}public static byte[] draw2PxPoint(Bitmap bmp) {//先设置一个足够大的size，最后在用数组拷贝复制到一个精确大小的byte数组中int size = bmp.getWidth() * bmp.getHeight() ;/// 8 + 1000;byte[] tmp = new byte[size];int k = 0;// 设置行距为0tmp[k++] = 0x1B;tmp[k++] = 0x33;tmp[k++] = 0x00;// 居中打印tmp[k++] = 0x1B;tmp[k++] = 0x61;tmp[k++] = 1;for (int j = 0; j < bmp.getHeight() / 24f; j++) {//-------------tmp[k++] = 0x1B;//设置水平绝对位置tmp[k++] = 0x24;tmp[k++] = (byte)0x96;
//            tmp[k++] = (byte)0x0c;tmp[k++] = 0x01;//-------------tmp[k++] = 0x1B;tmp[k++] = 0x2A;// 0x1B 2A 表示图片打印指令tmp[k++] = 33; // m=33时，选择24点密度打印tmp[k++] = (byte) (bmp.getWidth() % 256); // nLtmp[k++] = (byte) (bmp.getWidth() / 256); // nHfor (int i = 0; i < bmp.getWidth(); i++) {for (int m = 0; m < 3; m++) {for (int n = 0; n < 8; n++) {byte b = px2Byte(i, j * 24 + m * 8 + n, bmp);tmp[k] += tmp[k] + b;}k++;}}//tmp[k++] = 10;// 换行tmp[k++] = 0x1B;tmp[k++] = 0x4A;tmp[k++] = 0x18;tmp[k++] = 0x0D;}// 恢复默认行距tmp[k++] = 0x1B;tmp[k++] = 0x32;byte[] result = new byte[k];System.arraycopy(tmp, 0, result, 0, k);return result;
}public void test(){write(RESET); write(PAPER_UNIT);//定义单位write(PAPER_LENGHT_1);//设置页长printBitmap(bitmap);write(OUT,over);
}

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Android在针式打印机上通过ESC/P指令打印二维码

Android在针式打印机上通过ESC/P指令打印二维码

前言

正文

Android在针式打印机上通过ESC/P指令打印二维码相关推荐

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