پرینت حروف فارسی (موبایل پرینتر حرارتی)بلوتوث

دوستان سلام 

چاپ کارکتر های انگلیسی درست چاپ میشه اما کارکتر های فارسی رو به صورت علامت سوال نمایش میده

 package com.example.bluetoothprinter;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.Set;
import java.util.UUID;

import org.apache.http.util.EncodingUtils;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;


public class BluetoothprinterActivity extends Activity {

    // will show the statuses
    TextView         myLabel;

    // will enable user to enter any text to be printed
    EditText         myTextbox;

    // android built in classes for bluetooth operations
    BluetoothAdapter mBluetoothAdapter;
    BluetoothSocket  mmSocket;
    BluetoothDevice  mmDevice;

    OutputStream     mmOutputStream;
    InputStream      mmInputStream;
    Thread           workerThread;

    byte[]           readBuffer;
    int              readBufferPosition;
    int              counter;
    volatile boolean stopWorker;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        try {

            // we are goin to have three buttons for specific functions
            Button openButton = (Button) findViewById(R.id.open);
            Button sendButton = (Button) findViewById(R.id.send);
            Button closeButton = (Button) findViewById(R.id.close);

            myLabel = (TextView) findViewById(R.id.label);
            myTextbox = (EditText) findViewById(R.id.entry);

            // open bluetooth connection
            openButton.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    try {
                        findBT();
                        openBT();
                    }
                    catch (IOException ex) {}
                }
            });

            // send data typed by the user to be printed
            sendButton.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    try {
                        sendData();
                    }
                    catch (IOException ex) {}
                }
            });

            // close bluetooth connection
            closeButton.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    try {
                        closeBT();
                    }
                    catch (IOException ex) {}
                }
            });

        }
        catch (NullPointerException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }


    // This will find a bluetooth printer device
    void findBT() {

        try {

            mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

            if (mBluetoothAdapter == null) {
                myLabel.setText("No bluetooth adapter available");
            }

            if ( !mBluetoothAdapter.isEnabled()) {
                Intent enableBluetooth = new Intent(
                        BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableBluetooth, 0);
            }

            Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
                    .getBondedDevices();
            String deviceName = null;
            if (pairedDevices.size() > 0) {
                for (BluetoothDevice device: pairedDevices) {
                	deviceName=device.getName();
                    // MP300 is the name of the bluetooth printer device
                    if (device.getName().equals("Mobile Printer")) {
                    	 Toast.makeText(getApplicationContext(), "VV" , Toast.LENGTH_LONG).show();
                        mmDevice = device;
                        break;
                    }
                }
            }
            myLabel.setText("Bluetooth Device Found "+"|"+deviceName+"|" );
        }
        catch (NullPointerException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }


    // Tries to open a connection to the bluetooth printer device
    void openBT() throws IOException {
        try {
            // Standard SerialPortService ID
        	//00001101-0000-1000-8000-00805f9b34fb
            UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
            //Toast.makeText(getApplicationContext(), ""+uuid, Toast.LENGTH_LONG).show();
            mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
           // Toast.makeText(getApplicationContext(), "VV" , Toast.LENGTH_LONG).show();
            mmSocket.connect();
            mmOutputStream = mmSocket.getOutputStream();
            mmInputStream = mmSocket.getInputStream();

            beginListenForData();

            myLabel.setText("Bluetooth Opened");
        }
        catch (NullPointerException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }


    // After opening a connection to bluetooth printer device,
    // we have to listen and check if a data were sent to be printed.
    void beginListenForData() {
        try {
            final Handler handler = new Handler();

            // This is the ASCII code for a newline character
            final byte delimiter = 10;

            stopWorker = false;
            readBufferPosition = 0;
            readBuffer = new byte[1024];

            workerThread = new Thread(new Runnable() {

                @Override
                public void run() {
                    while ( !Thread.currentThread().isInterrupted()
                            && !stopWorker) {

                        try {

                            int bytesAvailable = mmInputStream.available();
                            if (bytesAvailable > 0) {
                                byte[] packetBytes = new byte[bytesAvailable];
                                mmInputStream.read(packetBytes);
                                for (int i = 0; i < bytesAvailable; i++) {
                                    byte b = packetBytes[i];
                                    if (b == delimiter) {
                                        byte[] encodedBytes = new byte[readBufferPosition];
                                        System.arraycopy(readBuffer, 0,
                                                encodedBytes, 0,
                                                encodedBytes.length);
                                        final String data = new String(
                                        		// encodedBytes, "US-ASCII");
                                                encodedBytes, "ISO-8859-1");
                                        readBufferPosition = 0;

                                        handler.post(new Runnable() {

                                            @Override
                                            public void run() {
                                                myLabel.setText(data);
                                            }
                                        });
                                    } else {
                                        readBuffer[readBufferPosition++] = b;
                                    }
                                }
                            }

                        }
                        catch (IOException ex) {
                            stopWorker = true;
                        }

                    }
                }
            });

            workerThread.start();
        }
        catch (NullPointerException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }


    /*
     * This will send data to be printed by the bluetooth printer
     */
    
    void sendData() throws IOException {
        try {

           
            String msg = myTextbox.getText().toString();
            msg += "\r\n";
            mmOutputStream.write(EncodingUtils.getBytes(msg, "ISO-8859-1"));
            // mmOutputStream.write(encodedBytes, "ISO-8859-1"));
           
        }
        catch (NullPointerException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
    

    // Close the connection to bluetooth printer.
    void closeBT() throws IOException {
        try {
            stopWorker = true;
            mmOutputStream.close();
            mmInputStream.close();
            mmSocket.close();
            myLabel.setText("Bluetooth Closed");
        }
        catch (NullPointerException e) {
            e.printStackTrace();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
    }