从Android设备通过Usb打印到热敏打印机 [英] Print to thermal Printer via Usb from Android Device
本文介绍了从Android设备通过Usb打印到热敏打印机的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我需要通过android平板电脑通过usb打印到热敏打印机，我的第一个问题是，可以做到吗?
我正在从应用程序将数据发送到热敏打印机.我已经使它可以通过网络正常工作，并且我的数据可以正确打印.现在还有一个附加要求，即我们还必须能够通过usb打印.
这是我尝试过的:
Hi,
I need to print to a thermal printer via usb from an android tablet, my first question is, can this be done?
I am working with sending data to a thermal printer from my application. I already have it working correctly over the network and my data prints correctly. There is now an additional requirement whereby we also have to be able to print via usb.
Here is what I''ve tried:
private UsbManager mUsbManager;
private UsbDevice mDevice;
private UsbDeviceConnection mConnection;
private UsbInterface mInterface;
private UsbEndpoint mEndPoint;
private PendingIntent mPermissionIntent;
private Context mContext;
// private BroadcastReceiver mUsbReceiver;
private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
private static Boolean forceCLaim = true;
HashMap<String, UsbDevice> mDeviceList;
Iterator<UsbDevice> mDeviceIterator;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
mDeviceList = mUsbManager.getDeviceList();
mContext = this.getApplicationContext();
mDeviceIterator = mDeviceList.values().iterator();
Button print = (Button)findViewById(R.id.print);
Toast.makeText(this, "Device List Size: " + String.valueOf(mDeviceList.size()), Toast.LENGTH_SHORT).show();
TextView textView = (TextView) findViewById(R.id.usbDevice);
String usbDevice = "";
while (mDeviceIterator.hasNext()) {
UsbDevice usbDevice1 = mDeviceIterator.next();
usbDevice += "\n" +
"DeviceID: " + usbDevice1.getDeviceId() + "\n" +
"DeviceName: " + usbDevice1.getDeviceName() + "\n" +
"Protocol: " + usbDevice1.getDeviceProtocol() + "\n" +
//"Product Name: " + usbDevice1.getProductName() +"\n" +
// "Manufacturer Name: " + usbDevice1.getManufacturerName() + "\n" +
"DeviceClass: " + usbDevice1.getDeviceClass() + " - " + translateDeviceClass(usbDevice1.getDeviceClass()) + "\n" +
"DeviceSubClass: " + usbDevice1.getDeviceSubclass() + "\n" +
"VendorID: " + usbDevice1.getVendorId() + "\n" +
"ProductID: " + usbDevice1.getProductId() + "\n";
int interfaceCount = usbDevice1.getInterfaceCount();
Toast.makeText(this, "INTERFACE COUNT: " + String.valueOf(interfaceCount), Toast.LENGTH_SHORT).show();
mDevice = usbDevice1;
if (mDevice == null) {
Toast.makeText(this, "mDevice is null", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, "mDevice is not null", Toast.LENGTH_SHORT).show();
}
textView.setText(usbDevice);
}
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
mUsbManager.requestPermission(mDevice, mPermissionIntent);
print.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
print(mConnection, mInterface);
}
});
}
private String translateDeviceClass(int deviceClass){
switch(deviceClass){
case UsbConstants.USB_CLASS_APP_SPEC:
return "Application specific USB class";
case UsbConstants.USB_CLASS_AUDIO:
return "USB class for audio devices";
case UsbConstants.USB_CLASS_CDC_DATA:
return "USB class for CDC devices (communications device class)";
case UsbConstants.USB_CLASS_COMM:
return "USB class for communication devices";
case UsbConstants.USB_CLASS_CONTENT_SEC:
return "USB class for content security devices";
case UsbConstants.USB_CLASS_CSCID:
return "USB class for content smart card devices";
case UsbConstants.USB_CLASS_HID:
return "USB class for human interface devices (for example, mice and keyboards)";
case UsbConstants.USB_CLASS_HUB:
return "USB class for USB hubs";
case UsbConstants.USB_CLASS_MASS_STORAGE:
return "USB class for mass storage devices";
case UsbConstants.USB_CLASS_MISC:
return "USB class for wireless miscellaneous devices";
case UsbConstants.USB_CLASS_PER_INTERFACE:
return "USB class indicating that the class is determined on a per-interface basis";
case UsbConstants.USB_CLASS_PHYSICA:
return "USB class for physical devices";
case UsbConstants.USB_CLASS_PRINTER:
return "USB class for printers";
case UsbConstants.USB_CLASS_STILL_IMAGE:
return "USB class for still image devices (digital cameras)";
case UsbConstants.USB_CLASS_VENDOR_SPEC:
return "Vendor specific USB class";
case UsbConstants.USB_CLASS_VIDEO:
return "USB class for video devices";
case UsbConstants.USB_CLASS_WIRELESS_CONTROLLER:
return "USB class for wireless controller devices";
default: return "Unknown USB class!";
}
}
private void print(final UsbDeviceConnection connection, final UsbInterface usbInterface) {
final Handler handler = new Handler();
Thread thread = new Thread() {
@Override
public void run() {
try {
UsbRequest request = new UsbRequest();
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "PRINT IS CALLED", Toast.LENGTH_SHORT).show();
}
});
String test = "THIS IS A PRINT TEST";
final byte[] testBytes = test.getBytes();
final int length = testBytes.length;
if (usbInterface == null) {
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "INTERFACE IS NULL", Toast.LENGTH_SHORT).show();
}
});
}
if (connection == null) {
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "CONNECTION IS NULL", Toast.LENGTH_SHORT).show();
}
});
} else {
}
if (forceCLaim == null) {
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "FORCE CLAIM IS NULL", Toast.LENGTH_SHORT).show();
}
});
} else {
}
if(connection.claimInterface(usbInterface, forceCLaim)){
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "INTERFACE CLAIM SUCCESSFUL", Toast.LENGTH_SHORT).show();
}
});
if (mEndPoint == null){
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "END POINT IS NULL", Toast.LENGTH_SHORT).show();
}
});
}
connection.controlTransfer(0x40, 0x03, 0x4138, 0, null, 0, 0);
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "CONTROL TRANSFER SET", Toast.LENGTH_SHORT).show();
}
});
final int transferResult = connection.bulkTransfer(mEndPoint, testBytes, length, 5000);
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "BULK TRANSFER RESULT: " + String.valueOf(transferResult), Toast.LENGTH_SHORT).show();
}
});
if(transferResult == length || transferResult == 0) {
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "TRANSFER SUCCESSFUL", Toast.LENGTH_SHORT).show();
}
});
}else{
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "TRANSFER UNSUCCESSFUL", Toast.LENGTH_SHORT).show();
}
});
}
}else{
handler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, "INTERFACE CLAIM UNSUCCESSFUL", Toast.LENGTH_SHORT).show();
}
});
}
} catch (Exception e) {}
}
};
thread.start();
}
批量传输成功，但是没有打印.有人可以建议吗?...
bulk transfer is successful, however there is no printing. Could someone please advise?...
推荐答案
在打印方法之前添加
Add before the print method
final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
@Override
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) {
//call method to set up device communication
mInterface = device.getInterface(0);
mEndPoint = mInterface.getEndpoint(0);
mConnection = mUsbManager.openDevice(device);
//setup();
}
} else {
//Log.d("SUB", "permission denied for device " + device);
Toast.makeText(context, "PERMISSION DENIED FOR THIS DEVICE", Toast.LENGTH_SHORT).show();
}
}
}
}
};
这篇关于从Android设备通过Usb打印到热敏打印机的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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