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);    }

添加一个boardcast action

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。注：android下USB具体的用法可以查看Usb通信之USB Host。

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;                }            }    }

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);            }        }    }

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

 @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;

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