Android下的POS打印机调用的简单实现教程

时间:2017-04-14 07:56:59 

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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