Re: [androidbrasil-dev] Re: Enviar um texto para uma porta USB

package com.dimep.satjni;

import java.nio.ByteBuffer;

import android.app.PendingIntent;

import android.content.Context;

import android.content.Intent;

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.os.Handler;

import android.os.Message;

import android.util.Log;

public class Impressora {

private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";

private UsbManager manager;

private UsbDevice device;

public Impressora(Context ctx, int venderId) {

manager = (UsbManager) ctx.getSystemService(ctx.USB_SERVICE);

for (UsbDevice dev : manager.getDeviceList().values()) {

if ((dev != null) && (dev.getVendorId() == venderId)) {

device = dev;

}

}

}

public boolean obterPermissao(Context ctx) {

if (manager.hasPermission(device)) {

return true;

} else {

PendingIntent pi = PendingIntent.getBroadcast(

ctx, 0, new Intent(

ACTION_USB_PERMISSION), 0);

manager.requestPermission(device, pi);

return false;

}

}

public void startPrinting(Context ctx, final String texto) throws Exception {

if (device == null)

throw new Exception("Nenhum dispositivo associado.");

obterPermissao(ctx);

Handler handler = new Handler();

handler.post(new Runnable() {

UsbDeviceConnection conn;

UsbInterface usbInterface;

@Override

public void run() {

try {

Log.i("Info", "Bulk transfer started");

// usbInterface = printerDevice.getInterface(0);

for (int i = 0; i < device.getInterfaceCount(); i++) {

usbInterface = device.getInterface(i);

if (usbInterface.getInterfaceClass() == UsbConstants.USB_CLASS_PRINTER) {

// usbInterface = mDevice;

}

}

UsbEndpoint endPoint = usbInterface.getEndpoint(0);

conn = manager.openDevice(device);

conn.claimInterface(usbInterface, true);

String myStringData = (char)27 + "" + (char)33 + "" + (char)16;

myStringData += "Teste de Impressao";

myStringData += "\n";

myStringData += (char)27 + "" + (char)33 + "" + (char)0;

myStringData += "Codigo: " + texto;

myStringData += "\n";

myStringData += "\n";

myStringData += "\n";

myStringData += (char)29 + "" + (char)86 + "" + (char)0;

byte[] array = myStringData.getBytes();

ByteBuffer output_buffer = ByteBuffer

.allocate(array.length);

UsbRequest request = new UsbRequest();

request.initialize(conn, endPoint);

request.queue(output_buffer, array.length);

if (conn.requestWait() == request) {

Log.i("Info", output_buffer.getChar(0) + "");

Message m = new Message();

m.obj = output_buffer.array();

output_buffer.clear();

} else {

Log.i("Info", "No request recieved");

}

int transfered = conn.bulkTransfer(endPoint,

myStringData.getBytes(),

myStringData.getBytes().length, 5000);

Log.i("Info", "Amount of data transferred : " + transfered);

} catch (Exception e) {

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");

} catch (Exception e) {

Log.e("Exception",

"Unable to release resources because : "

+ e.getMessage());

e.printStackTrace();

}

}

}

});

}

}