Problème d'imprimante Bluetooth dans Android

Je suis en train d'imprimer le projet de loi par le biais de bluetooth en utilisant le code suivant
quand je lance l'application, pour la première fois son être imprimé, mais quand j'ai réessayer de son ne pas obtenir de l'imprimé.

package com.sel.bluetooth;
import java.io.OutputStream;
import java.lang.reflect.Method;
import android.app.Activity;
import android.app.Dialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
public class BluetoothPrint extends Activity {
BluetoothAdapter mBTAdapter;
BluetoothSocket mBTSocket = null;
Dialog dialogProgress;
String BILL, TRANS_ID;
String PRINTER_MAC_ID;
final String ERROR_MESSAGE = "There has been an error in printing the bill.";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
//BILL = getIntent().getStringExtra("TO_PRINT");
//TRANS_ID = getIntent().getStringExtra("TRANS_ID");
//PRINTER_MAC_ID = getIntent().getStringExtra("MAC_ID");
PRINTER_MAC_ID = "00:1F:B7:02:8F:44";
//PRINTER_MAC_ID = "00:12:F3:0D:A3:E6";
//TRANS_ID="12345678";
BILL = "\nSale Slip No: 12345678" + "          " + "04-08-2011\n";
BILL = BILL + "----------------------------------------";
BILL = BILL + "\n\n";
BILL = BILL + "Total Qty:" + "     " + "2.0\n";
BILL = BILL + "Total Value:" + "     " + "17625.0\n";
BILL = BILL + "-----------------------------------------";
mBTAdapter = BluetoothAdapter.getDefaultAdapter();
dialogProgress = new Dialog(BluetoothPrint.this);
try {
if (mBTAdapter.isDiscovering())
mBTAdapter.cancelDiscovery();
else
mBTAdapter.startDiscovery();
} catch (Exception e) {
Log.e("Class ", "My Exe ", e);
}
System.out.println("BT Searching status :"
+ mBTAdapter.isDiscovering());
if (mBTAdapter == null) {
Toast.makeText(this, "Device has no bluetooth capability",
Toast.LENGTH_LONG).show();
finish();
} else {
if (!mBTAdapter.isEnabled()) {
Intent i = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(i, 0);
}
//Register the BroadcastReceiver
IntentFilter filter = new IntentFilter(
BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter); //Don't forget to
//unregister during
//onDestroy
dialogProgress.setTitle("Finding printer...");
dialogProgress
.setOnDismissListener(new DialogInterface.OnDismissListener() {
public void onDismiss(DialogInterface dialog) {
dialog.dismiss();
setResult(RESULT_CANCELED);
finish();
}
});
dialogProgress.show();
}
} catch (Exception e) {
Log.e("Class ", "My Exe ", e);
}
}
public void printBillToDevice(final String address) {
new Thread(new Runnable() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
dialogProgress.setTitle("Connecting...");
dialogProgress.show();
}
});
mBTAdapter.cancelDiscovery();
try {
System.out
.println("**************************#****connecting");
BluetoothDevice mdevice = mBTAdapter
.getRemoteDevice(address);
Method m = mdevice.getClass().getMethod(
"createRfcommSocket", new Class[] { int.class });
mBTSocket = (BluetoothSocket) m.invoke(mdevice, 1);
mBTSocket.connect();
OutputStream os = mBTSocket.getOutputStream();
os.flush();
os.write(BILL.getBytes());
System.out.println(BILL);
//mBTSocket.close();
setResult(RESULT_OK);
finish();
} catch (Exception e) {
Log.e("Class ", "My Exe ", e);
//Toast.makeText(BluetoothPrint.this, ERROR_MESSAGE,            Toast.LENGTH_SHORT).show();
e.printStackTrace();
setResult(RESULT_CANCELED);
finish();
}
runOnUiThread(new Runnable() {
public void run() {
try {
dialogProgress.dismiss();
} catch (Exception e) {
Log.e("Class ", "My Exe ", e);
}
}
});
}
}).start();
}
@Override
protected void onDestroy() {
Log.i("Dest ", "Checking Ddest");
super.onDestroy();
try {
if(dialogProgress != null)
dialogProgress.dismiss();
if (mBTAdapter != null)
mBTAdapter.cancelDiscovery();
this.unregisterReceiver(mReceiver);
} catch (Exception e) {
Log.e("Class ", "My Exe ", e);
}
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
try {
String action = intent.getAction();
//When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
//Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
System.out.println("***" + device.getName() + " : "
+ device.getAddress());
if (device.getAddress().equalsIgnoreCase(PRINTER_MAC_ID)) {
mBTAdapter.cancelDiscovery();
dialogProgress.dismiss();
Toast.makeText(BluetoothPrint.this,
device.getName() + " Printing data",
Toast.LENGTH_LONG).show();
printBillToDevice(PRINTER_MAC_ID);
Toast.makeText(BluetoothPrint.this,
device.getName() + " found", Toast.LENGTH_LONG)
.show();
}
}
} catch (Exception e) {
Log.e("Class  ", "My Exe ", e);
//Toast.makeText(BluetoothPrint.this, ERROR_MESSAGE,                        Toast.LENGTH_SHORT).show();
}
}
};
@Override
public void onBackPressed() {
try {
if (mBTAdapter != null)
mBTAdapter.cancelDiscovery();
this.unregisterReceiver(mReceiver);
} catch (Exception e) {
Log.e("Class ", "My Exe ", e);
}
setResult(RESULT_CANCELED);
finish();
}
}

source d'informationauteur Selvam Rajendran