Android下的POS打印机调用的简单实现教程

  本文基于GP58系列,它可以兼容ESC/POS指令集,对EPSON的打印机通用.

  Android下的设备调试,如果设备提供了驱动,按照厂家的驱动调试即可;设备未提供驱动,只能按照通用的方法进行调试。这里采用的是调用USB接口来控制打印机输出。

  1.首先获取USB管理器

  public UsbAdmin(Context context) {

  mUsbManager = (UsbManager) context.getSystemService(Context.USB_SERVICE);

  mPermissionIntent = PendingIntent.getBroadcast(context, 0, new Intent(ACTION_USB_PERMISSION), 0);

  IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);

  context.registerReceiver(mUsbReceiver, filter);

  }

  使用一个延迟意图来接收usb接入时的广播,当广播接收到时,说明有新的设备接入。

  添加一个boardcast action

  复制代码 代码如下:

  private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";

  private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {

  public void onReceive(Context context, Intent intent) {

  String action = intent.getAction();

  if (ACTION_USB_PERMISSION.equals(action)) {

  synchronized (this) {

  UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);

  if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {

  if (device != null) {

  setDevice(device);

  } else {

  Closeusb();

  // mDevice = device;

  }

  } else {

  Log.d(TAG, "permission denied for device " + device);

  }

  }

  }

  }

  };

  取到usb设备的引用,android系统会询问你是否允许设备访问,默认为false;当允许了访问之后,会判断USB的引用是否为null,如果不为空则会调用setDevice来创建一个Connection,否则会关闭本次连接。

  在setDevice中,我们可以获取设备的功能集(UsbInterface),也可以获取通信通道(UsbEndpoint),同时也创建了host与device的连接用来传输数据。

  private void setDevice(UsbDevice device) {

  if (device != null) {

  UsbInterface intf = null;

  UsbEndpoint ep = null;

  int InterfaceCount = device.getInterfaceCount();

  int j;

  mDevice = device;

  for (j = 0; j < InterfaceCount; j++) {

  int i;

  intf = device.getInterface(j);

  Log.i(TAG, "接口是:" + j + "类是:" + intf.getInterfaceClass());

  if (intf.getInterfaceClass() == 7) {

  int UsbEndpointCount = intf.getEndpointCount();

  for (i = 0; i < UsbEndpointCount; i++) {

  ep = intf.getEndpoint(i);

  Log.i(TAG, "端点是:" + i + "方向是:" + ep.getDirection() + "类型是:" + ep.getType());

  if (ep.getDirection() == 0 && ep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {

  Log.i(TAG, "接口是:" + j + "端点是:" + i);

  break;

  }

  }

  if (i != UsbEndpointCount) {

  break;

  }

  }

  }

  if (j == InterfaceCount) {

  Log.i(TAG, "没有打印机接口");

  return;

  }

  mEndpointIntr = ep;

  UsbDeviceConnection connection = mUsbManager.openDevice(device);

  if (connection != null && connection.claimInterface(intf, true)) {

  Log.i(TAG, "打开成功! ");

  mConnection = connection;

  } else {

  Log.i(TAG, "打开失败! ");

  mConnection = null;

  }

  }

  }

  2.在相关的类中新建一个UsbAdmin,调用openUsb,这里首先是走了上面的setDevice()方法,获取到了设备的引用,当连接通道建立时列出所有USB设备,当设备的引用不存在时同样列出所有的USB设备,并且都请求获取USB权限。

  public void openUsb() {

  if (mDevice != null) {

  setDevice(mDevice);

  if (mConnection == null) {

  HashMap deviceList = mUsbManager.getDeviceList();

  Iterator deviceIterator = deviceList.values().iterator();

  while (deviceIterator.hasNext()) {

  UsbDevice device = deviceIterator.next();

  mUsbManager.requestPermission(device, mPermissionIntent);

  }

  }

  } else {

  HashMap deviceList = mUsbManager.getDeviceList();

  Iterator deviceIterator = deviceList.values().iterator();

  while (deviceIterator.hasNext()) {

  UsbDevice device = deviceIterator.next();

  mUsbManager.requestPermission(device, mPermissionIntent);

  }

  }

  }

  3.当上面两部都走完了之后,我们就可以发送指令来控制已经建立连接的打印机了,这里我们使用的是标准的ESC/POS指令集,为硬件默认,贴出代码,这里的指令集采用的是十进制表示形式,也可以替换成十六进制。

  public class printerCmdUtils {

  /**

  * 这些数据源自爱普生指令集,为POS机硬件默认

  */

  public static final byte ESC = 27;//换码

  public static final byte FS = 28;//文本分隔符

  public static final byte GS = 29;//组分隔符

  public static final byte DLE = 16;//数据连接换码

  public static final byte EOT = 4;//传输结束

  public static final byte ENQ = 5;//询问字符

  public static final byte SP = 32;//空格

  public static final byte HT = 9;//横向列表

  public static final byte LF = 10;//打印并换行(水平定位)

  public static final byte CR = 13;//归位键

  public static final byte FF = 12;//走纸控制(打印并回到标准模式(在页模式下) )

  public static final byte CAN = 24;//作废(页模式下取消打印数据 )

  //------------------------打印机初始化-----------------------------

  /**

  * 打印机初始化

  * @return

  */

  public static byte[] init_printer()

  {

  byte[] result = new byte[2];

  result[0] = ESC;

  result[1] = 64;

  return result;

  }

  //------------------------换行-----------------------------

  /**

  * 换行

  * @param lineNum要换几行

  * @return

  */

  public static byte[] nextLine(int lineNum)

  {

  byte[] result = new byte[lineNum];

  for(int i=0;i

  {

  result[i] = LF;

  }

  return result;

  }

  //------------------------下划线-----------------------------

  /**

  * 绘制下划线(1点宽)

  * @return

  */

  public static byte[] underlineWithOneDotWidthOn()

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 45;

  result[2] = 1;

  return result;

  }

  /**

  * 绘制下划线(2点宽)

  * @return

  */

  public static byte[] underlineWithTwoDotWidthOn()

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 45;

  result[2] = 2;

  return result;

  }

  /**

  * 取消绘制下划线

  * @return

  */

  public static byte[] underlineOff()

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 45;

  result[2] = 0;

  return result;

  }

  //------------------------加粗-----------------------------

  /**

  * 选择加粗模式

  * @return

  */

  public static byte[] boldOn()

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 69;

  result[2] = 0xF;

  return result;

  }

  /**

  * 取消加粗模式

  * @return

  */

  public static byte[] boldOff()

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 69;

  result[2] = 0;

  return result;

  }

  //------------------------对齐-----------------------------

  /**

  * 左对齐

  * @return

  */

  public static byte[] alignLeft()

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 97;

  result[2] = 0;

  return result;

  }

  /**

  * 居中对齐

  * @return

  */

  public static byte[] alignCenter()

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 97;

  result[2] = 1;

  return result;

  }

  /**

  * 右对齐

  * @return

  */

  public static byte[] alignRight()

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 97;

  result[2] = 2;

  return result;

  }

  /**

  * 水平方向向右移动col列

  * @param col

  * @return

  */

  public static byte[] set_HT_position( byte col )

  {

  byte[] result = new byte[4];

  result[0] = ESC;

  result[1] = 68;

  result[2] = col;

  result[3] = 0;

  return result;

  }

  //------------------------字体变大-----------------------------

  /**

  * 字体变大为标准的n倍

  * @param num

  * @return

  */

  public static byte[] fontSizeSetBig(int num)

  {

  byte realSize = 0;

  switch (num)

  {

  case 1:

  realSize = 0;break;

  case 2:

  realSize = 17;break;

  case 3:

  realSize = 34;break;

  case 4:

  realSize = 51;break;

  case 5:

  realSize = 68;break;

  case 6:

  realSize = 85;break;

  case 7:

  realSize = 102;break;

  case 8:

  realSize = 119;break;

  }

  byte[] result = new byte[3];

  result[0] = 29;

  result[1] = 33;

  result[2] = realSize;

  return result;

  }

  //------------------------字体变小-----------------------------

  /**

  * 字体取消倍宽倍高

  * @param num

  * @return

  */

  public static byte[] fontSizeSetSmall(int num)

  {

  byte[] result = new byte[3];

  result[0] = ESC;

  result[1] = 33;

  return result;

  }

  //------------------------切纸-----------------------------

  /**

  * 进纸并全部切割

  * @return

  */

  public static byte[] feedPaperCutAll()

  {

  byte[] result = new byte[4];

  result[0] = GS;

  result[1] = 86;

  result[2] = 65;

  result[3] = 0;

  return result;

  }

  /**

  * 进纸并切割(左边留一点不切)

  * @return

  */

  public static byte[] feedPaperCutPartial()

  {

  byte[] result = new byte[4];

  result[0] = GS;

  result[1] = 86;

  result[2] = 66;

  result[3] = 0;

  return result;

  }

  //------------------------切纸-----------------------------

  public static byte[] byteMerger(byte[] byte_1, byte[] byte_2){

  byte[] byte_3 = new byte[byte_1.length+byte_2.length];

  System.arraycopy(byte_1, 0, byte_3, 0, byte_1.length);

  System.arraycopy(byte_2, 0, byte_3, byte_1.length, byte_2.length);

  return byte_3;

  }

  public static byte[] byteMerger(byte[][] byteList){

  int length = 0;

  for(int i=0;i

  {

  length += byteList[i].length;

  }

  byte[] result = new byte[length];

  int index = 0;

  for(int i=0;i

  {

  byte[] nowByte = byteList[i];

  for(int k=0;k

  {

  result[index] = nowByte[k];

  index++;

  }

  }

  return result;

  }

  }

  4.在以上都完成之后,就可以把你需要的字符串转换成byte数组并调用sendCommand方法来进行打印了

  @SuppressLint("NewApi")

  public boolean sendCommand(byte[] Content) {

  boolean Result;

  synchronized (this) {

  int len = -1;

  if (mConnection != null) {

  len = mConnection.bulkTransfer(mEndpointIntr, Content, Content.length, 10000);

  }

  if (len < 0) {

  Result = false;

  Log.i(TAG, "发送失败! " + len);

  } else {

  Result = true;

  Log.i(TAG, "发送" + len + "字节数据");

  }

  }

  return Result;

  复制代码 代码如下:

  len = mConnection.bulkTransfer(mEndpointIntr, Content, Content.length, 10000);

  这一步仅仅加了同步锁,并未开启一个新的线程去处理,在本机上没有问题,但上面的USB通信机制的文章有提到要放到异步线程,这里需要注意。

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