Java 使用USB OTG打印PDF文件，打印机-Epson L130
我可以连接到打印机。m面临的问题是——它正在打印字节数组。请一定要看看代码，在我发送字节数组。我保存了一个pDF文件。很抱歉评论了这些试用版。先谢谢你。感谢您的帮助。 包com.net.atos.printusbJava 使用USB OTG打印PDF文件，打印机-Epson L130,java,android,Java,Android,我可以连接到打印机。m面临的问题是——它正在打印字节数组。请一定要看看代码，在我发送字节数组。我保存了一个pDF文件。很抱歉评论了这些试用版。先谢谢你。感谢您的帮助。 包com.net.atos.printusb import android.annotation.TargetApi; import android.app.PendingIntent;
import android.annotation.TargetApi;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.hardware.usb.UsbRequest;
import android.net.Uri;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Iterator;
public class PrintMessage extends AppCompatActivity {
private final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
Button create_file;
PendingIntent mPermissionIntent;
UsbManager usbManager;
UsbDevice device;
EditText print_text;
UsbDevice printer = null;
private static final int PRINTER_VENDOR_ID_1 = 1208;
private static final int PRINTER_VENDOR_ID_2 = 5401;
private BufferedOutputStream mOutputStream;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_print_message);
try{
print_text = (EditText)findViewById(R.id.edt_print);
usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
if (deviceList.size() <= 0)
{
Toast.makeText(getApplicationContext(), "Info: No device found", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(getApplicationContext(), "No of devices " + deviceList.size(), Toast.LENGTH_SHORT).show();
/* ((TextView) findViewById(R.id.textView_devices))
.setText("No of device : " + deviceList.size());*/
}
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
int count = 0;
mPermissionIntent = PendingIntent.getBroadcast(getBaseContext(), 0, new Intent(ACTION_USB_PERMISSION), 0);
while (deviceIterator.hasNext())
{
count++;
device = deviceIterator.next();
Toast.makeText(PrintMessage.this, " vendor id " + device.getVendorId(), Toast.LENGTH_LONG).show();
Toast.makeText(PrintMessage.this, " prod id " + device.getProductId(), Toast.LENGTH_LONG).show();
Toast.makeText(PrintMessage.this, " device name " + device.getDeviceName(), Toast.LENGTH_LONG).show();
if (device.getVendorId() == PRINTER_VENDOR_ID_1 || device.getVendorId() == PRINTER_VENDOR_ID_2 ) {
printer = device;
break;
}
}
findViewById(R.id.btn_print).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (print_text.getText().toString().length() > 0) {
Log.i("Info", "Print command given");
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
Toast.makeText(PrintMessage.this, "register receiver called ", Toast.LENGTH_LONG).show();
if (printer != null) {
usbManager.requestPermission(printer, mPermissionIntent);
Toast.makeText(PrintMessage.this, "Printer found- request permission ", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(PrintMessage.this, "Printer not found", Toast.LENGTH_LONG).show();
Log.e("Exception", "Printer not found");
}
} else
{
Toast.makeText(PrintMessage.this, "Please write something to print", Toast.LENGTH_SHORT).show();
}
}
});
} catch (Exception e) {
Log.e("Exception", "Exception in onCreate " + e.getMessage());
Toast.makeText(PrintMessage.this, " Exception in onCreate "+e.getMessage(), Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
try {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action))
{
synchronized (this)
{
final UsbDevice printerDevice = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false))
{
if (printerDevice != null) {
Log.i("Info", "Device permission granted");
startPrinting(printerDevice);
Toast.makeText(PrintMessage.this, "start printing method called", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(PrintMessage.this, "printerDevice is null", Toast.LENGTH_SHORT).show();
}
}
else
{
Log.d("Debug", "permission denied for device "
+ printerDevice);
}
}
}
} catch (Exception e)
{
Toast.makeText(PrintMessage.this, "in receiver "+e.getMessage(), Toast.LENGTH_SHORT).show();
Log.e("Exception", "Exception in onRecieve " + e.getMessage());
e.printStackTrace();
}
}
};
public void startPrinting(final UsbDevice printerDevice)
{
new Handler().post(new Runnable()
{
UsbDeviceConnection conn;
UsbInterface usbInterface;
byte[] byteArray;
@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
public void run()
{
try
{
Log.i("Info", "Bulk transfer started");
usbInterface = printerDevice.getInterface(0);
UsbEndpoint endPoint = usbInterface.getEndpoint(1);
conn = usbManager.openDevice(printer);
conn.claimInterface(usbInterface, true);
//file init
File pdfFile = new File("/storage/emulated/0/sample/sample.pdf");
byte[] byteArray = new byte[(int) pdfFile.length()];
FileInputStream fis = new FileInputStream(pdfFile);
fis.read(byteArray);
// fis.close();
fis.close();
Toast.makeText(PrintMessage.this, "driver spson ", Toast.LENGTH_SHORT).show();
ByteBuffer output_buffer = ByteBuffer.allocate(byteArray.length);
UsbRequest request = new UsbRequest();
request.initialize(conn, endPoint);
request.queue(output_buffer, byteArray.length);
Toast.makeText(PrintMessage.this, " "+byteArray.toString().length(), Toast.LENGTH_SHORT).show();
if (conn.requestWait() == request)
{
Log.i("Info", output_buffer.getChar(0) + "");
Message m = new Message();
m.obj = output_buffer.array();
Toast.makeText(PrintMessage.this, "in if condition " , Toast.LENGTH_SHORT).show();
// handler.sendMessage(m);
output_buffer.clear();
}
else
{
Log.i("Info", "No request recieved");
Toast.makeText(PrintMessage.this, "No request recieved" , Toast.LENGTH_SHORT).show();
}
// File file = new File("/storage/emulated/0/sample/sample.pdf");
// String string = "\nThis \nis \nmy \nsample \ntext";
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("/storage/emulated/0/sample/sample.pdf"));
bos.write(byteArray);
bos.flush();
bos.close();
int transfered = conn.bulkTransfer(endPoint, byteArray /*encoded.getBytes()*/ /*byteArray*/, byteArray/*encoded.getBytes()*//*byteArray*/.length, 5000);
Log.i("Info", "Amount of data transferred : " +transfered);
Toast.makeText(PrintMessage.this, "bulk transfer " +transfered , Toast.LENGTH_SHORT).show();
} catch (Exception e)
{
Toast.makeText(PrintMessage.this, " in startPrinting " + e.getMessage(), Toast.LENGTH_SHORT).show();
Log.e("Exception", "Unable to transfer bulk data");
e.printStackTrace();
} finally
{
try
{
conn.releaseInterface(usbInterface);
Log.i("Info", "Interface released");
conn.close();
Log.i("Info", "Usb connection closed");
unregisterReceiver(mUsbReceiver);
Log.i("Info", "Brodcast reciever unregistered");
Toast.makeText(PrintMessage.this, "in finally block " , Toast.LENGTH_SHORT).show();
}
catch (Exception e)
{
Toast.makeText(PrintMessage.this, "startprinting finally " + e.getMessage(), Toast.LENGTH_SHORT).show();
Log.e("Exception", "Unable to release resources because : " + e.getMessage());
e.printStackTrace();
}
}
}
});
}
}
导入android.annotation.TargetApi；
导入android.app.pendingent；
导入android.content.BroadcastReceiver；
导入android.content.Context；
导入android.content.ContextWrapper；
导入android.content.Intent；
导入android.content.IntentFilter；
导入android.hardware.usb.UsbConstants；
导入android.hardware.usb.UsbDevice；
导入android.hardware.usb.UsbDeviceConnection；
导入android.hardware.usb.UsbEndpoint；
导入android.hardware.usb.usb接口；
导入android.hardware.usb.UsbManager；
导入android.hardware.usb.UsbRequest；
导入android.net.Uri；
导入android.os.Build；
导入android.os.Handler；
导入android.os.Message；
导入android.support.v7.app.AppActivity；
导入android.os.Bundle；
导入android.util.Base64；
导入android.util.Log；
导入android.view.view；
导入android.widget.Button；
导入android.widget.EditText；
导入android.widget.Toast；
导入java.io.BufferedOutputStream；
导入java.io.File；
导入java.io.FileInputStream；
导入java.io.FileOutputStream；
导入java.nio.ByteBuffer；
导入java.util.HashMap；
导入java.util.Iterator；
公共类PrintMessage扩展了AppCompative活动{
私有最终字符串操作\u USB\u PERMISSION=“com.android.example.USB\u PERMISSION”；
按钮创建_文件；
悬而未决的犯罪意图；
UsbManager UsbManager；
USB设备；
编辑文本打印文本；
USB设备打印机=空；
专用静态最终整型打印机\u供应商\u ID\u 1=1208；
专用静态最终整型打印机\u供应商\u ID\u 2=5401；
私有缓冲输出流mOutputStream；
@凌驾
创建时受保护的void（Bundle savedInstanceState）
{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u print\u message）；
试一试{
print_text=（EditText）findViewById（R.id.edt_print）；
usbManager=（usbManager）getSystemService（Context.USB_服务）；
HashMap deviceList=usbManager.getDeviceList（）；
if（deviceList.size（）0）{
Log.i（“信息”，“给出打印命令”）；
IntentFilter筛选器=新建IntentFilter（操作\u USB\u权限）；
寄存器接收器（mUsbReceiver，过滤器）；
Toast.makeText（PrintMessage.this，“注册接收器调用”，Toast.LENGTH_LONG.show（）；
如果（打印机！=null）{
usbManager.requestPermission（打印机、mPermissionIntent）；
Toast.makeText（PrintMessage.this，“找到打印机-请求权限”，Toast.LENGTH_LONG.show（）；
}否则{
Toast.makeText（PrintMessage.this，“未找到打印机”，Toast.LENGTH_LONG.show（）；
Log.e（“异常”，“未找到打印机”）；
}
}否则
{
Toast.makeText（PrintMessage.this，“请写些东西打印”，Toast.LENGTH_SHORT.show（）；
}
}