Android下的設備調(diào)試，如果設備提供了驅(qū)動，按照廠家的驅(qū)動調(diào)試即可;設備未提供驅(qū)動，只能按照通用的方法進行調(diào)試。這里采用的是調(diào)用USB接口來控制打印機輸出。
1.首先獲取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);
}
使用一個延遲意圖來接收usb接入時的廣播，當廣播接收到時，說明有新的設備接入。
添加一個boardcast action
復制代碼 代碼如下:
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設備的引用，android系統(tǒng)會詢問你是否允許設備訪問，默認為false;當允許了訪問之后，會判斷USB的引用是否為null，如果不為空則會調(diào)用setDevice來創(chuàng)建一個Connection，否則會關(guān)閉本次連接。
在setDevice中，我們可以獲取設備的功能集(UsbInterface)，也可以獲取通信通道(UsbEndpoint)，同時也創(chuàng)建了host與device的連接用來傳輸數(shù)據(jù)。
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 + "類是:" + intf.getInterfaceClass());
if (intf.getInterfaceClass() == 7) {
int UsbEndpointCount = intf.getEndpointCount();
for (i = 0; i < UsbEndpointCount; i++) {
ep = intf.getEndpoint(i);
Log.i(TAG, "端點是:" + i + "方向是:" + ep.getDirection() + "類型是:" + ep.getType());
if (ep.getDirection() == 0 && ep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {
Log.i(TAG, "接口是:" + j + "端點是:" + i);
break;
}
}
if (i != UsbEndpointCount) {
break;
}
}
}
if (j == InterfaceCount) {
Log.i(TAG, "沒有打印機接口");
return;
}
mEndpointIntr = ep;
UsbDeviceConnection connection = mUsbManager.openDevice(device);
if (connection != null && connection.claimInterface(intf, true)) {
Log.i(TAG, "打開成功! ");
mConnection = connection;
} else {
Log.i(TAG, "打開失敗! ");
mConnection = null;
}
}
}
2.在相關(guān)的類中新建一個UsbAdmin，調(diào)用openUsb，這里首先是走了上面的setDevice()方法，獲取到了設備的引用，當連接通道建立時列出所有USB設備，當設備的引用不存在時同樣列出所有的USB設備，并且都請求獲取USB權(quán)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.當上面兩部都走完了之后，我們就可以發(fā)送指令來控制已經(jīng)建立連接的打印機了，這里我們使用的是標準的ESC/POS指令集，為硬件默認，貼出代碼，這里的指令集采用的是十進制表示形式，也可以替換成十六進制。
public class printerCmdUtils {
/**
* 這些數(shù)據(jù)源自愛普生指令集,為POS機硬件默認
*/
public static final byte ESC = 27;//換碼
public static final byte FS = 28;//文本分隔符
public static final byte GS = 29;//組分隔符
public static final byte DLE = 16;//數(shù)據(jù)連接換碼
public static final byte EOT = 4;//傳輸結(jié)束
public static final byte ENQ = 5;//詢問字符
public static final byte SP = 32;//空格
public static final byte HT = 9;//橫向列表
public static final byte LF = 10;//打印并換行(水平定位)
public static final byte CR = 13;//歸位鍵
public static final byte FF = 12;//走紙控制(打印并回到標準模式(在頁模式下) )
public static final byte CAN = 24;//作廢(頁模式下取消打印數(shù)據(jù) )
//------------------------打印機初始化-----------------------------
/**
* 打印機初始化
* @return
*/
public static byte[] init_printer()
{
byte[] result = new byte[2];
result[0] = ESC;
result[1] = 64;
return result;
}
//------------------------換行-----------------------------
/**
* 換行
* @param lineNum要換幾行
* @return
*/
public static byte[] nextLine(int lineNum)
{
byte[] result = new byte[lineNum];
for(int i=0;i
{
result[i] = LF;
}
return result;
}
//------------------------下劃線-----------------------------
/**
* 繪制下劃線(1點寬)
* @return
*/
public static byte[] underlineWithOneDotWidthOn()
{
byte[] result = new byte[3];
result[0] = ESC;
result[1] = 45;
result[2] = 1;
return result;
}
/**
* 繪制下劃線(2點寬)
* @return
*/
public static byte[] underlineWithTwoDotWidthOn()
{
byte[] result = new byte[3];
result[0] = ESC;
result[1] = 45;
result[2] = 2;
return result;
}
/**
* 取消繪制下劃線
* @return
*/
public static byte[] underlineOff()
{
byte[] result = new byte[3];
result[0] = ESC;
result[1] = 45;
result[2] = 0;
return result;
}
//------------------------加粗-----------------------------
/**
* 選擇加粗模式
* @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;
}
//------------------------對齊-----------------------------
/**
* 左對齊
* @return
*/
public static byte[] alignLeft()
{
byte[] result = new byte[3];
result[0] = ESC;
result[1] = 97;
result[2] = 0;
return result;
}
/**
* 居中對齊
* @return
*/
public static byte[] alignCenter()
{
byte[] result = new byte[3];
result[0] = ESC;
result[1] = 97;
result[2] = 1;
return result;
}
/**
* 右對齊
* @return
*/
public static byte[] alignRight()
{
byte[] result = new byte[3];
result[0] = ESC;
result[1] = 97;
result[2] = 2;
return result;
}
/**
* 水平方向向右移動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;
}
//------------------------字體變大-----------------------------
/**
* 字體變大為標準的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;
}
//------------------------字體變小-----------------------------
/**
* 字體取消倍寬倍高
* @param num
* @return
*/
public static byte[] fontSizeSetSmall(int num)
{
byte[] result = new byte[3];
result[0] = ESC;
result[1] = 33;
return result;
}
//------------------------切紙-----------------------------
/**
* 進紙并全部切割
* @return
*/
public static byte[] feedPaperCutAll()
{
byte[] result = new byte[4];
result[0] = GS;
result[1] = 86;
result[2] = 65;
result[3] = 0;
return result;
}
/**
* 進紙并切割(左邊留一點不切)
* @return
*/
public static byte[] feedPaperCutPartial()
{
byte[] result = new byte[4];
result[0] = GS;
result[1] = 86;
result[2] = 66;
result[3] = 0;
return result;
}
//------------------------切紙-----------------------------
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轉(zhuǎn)換成byte數(shù)組并調(diào)用sendCommand方法來進行打印了
@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, "發(fā)送失敗! " + len);
} else {
Result = true;
Log.i(TAG, "發(fā)送" + len + "字節(jié)數(shù)據(jù)");
}
}
return Result;
復制代碼 代碼如下:
len = mConnection.bulkTransfer(mEndpointIntr, Content, Content.length, 10000);