Client Bluetooth

package com.sfatandrei.android.bluetoothclient;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.Set;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class BluetoothClient extends Activity {

    private static final String TAG = "MyActivity";
    private static final int REQUEST_ENABLE_BT = 0;
    private BluetoothAdapter mBtAdapter;
    private BluetoothSocket socket;
    private Button button;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Log.d(TAG, "ON CREATE");
    }


    @Override
    protected void onStart() {
        super.onStart();
        Log.d(TAG, "ON START");
        button = (Button) findViewById(R.id.button1);

        establishConnection();


    }



    private void establishConnection() {
        try {
            mBtAdapter = BluetoothAdapter.getDefaultAdapter();
            if (mBtAdapter == null) {
                Toast.makeText(BluetoothClient.this, "Bluetooth not supported", Toast.LENGTH_SHORT).show();
                Log.d(TAG,"Bluetooth not supported.");
                finish();
            }

        } catch (Exception e) {
            Log.e(TAG, "Error connecting to device", e);
            Toast.makeText(BluetoothClient.this, "Error connecting to destkop application.", Toast.LENGTH_SHORT).show();
        }

        try
        {
            if (!mBtAdapter.isEnabled()) {
                mBtAdapter.enable();
            }
            while(true){
                Log.d(TAG, "INSIDE WHILE STATE ON");
                if (mBtAdapter.getState() == BluetoothAdapter.STATE_ON)
                    break;
            }

            boolean result = mBtAdapter.startDiscovery();
            Log.d(TAG, "Start discovery = " + result);

            while(true){
                Log.d(TAG, "INSIDE WHILE IS DISCOVERING");
                if (mBtAdapter.isDiscovering() == true){
                    mBtAdapter.cancelDiscovery();
                    break;
                }
            }

            connectToBondedDevice();

            button.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    Log.d(TAG,"In listener button.");
                    try {
                        if (socket != null)
                            socket.getOutputStream().write("Hello, world!".getBytes());
                        else
                            Toast.makeText(BluetoothClient.this, "Not connected to destkop application.", Toast.LENGTH_SHORT).show();
                    } catch (IOException e) {
                        Log.d(TAG, e.toString());
                        e.printStackTrace();
                    }
                }
            });
        }
        catch(Exception ex)
        {
            Log.d(TAG,ex.toString());
        }
    }

    private void connectToBondedDevice(){
        Set<BluetoothDevice> setOfDevices = mBtAdapter.getBondedDevices();
        if (setOfDevices.isEmpty())
            Log.d(TAG, "NULL BLUETOOTH SET");
        for (BluetoothDevice bt : setOfDevices){
            if (bt.getAddress().equals("50:63:13:A1:21:9E")){
                try {
                    Method m;
                    try {
                        m = bt.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
                        socket = (BluetoothSocket) m.invoke(bt, 1);
                    } catch (Exception e) {
                        Log.d(TAG, e.toString());
                    }
                    Log.d(TAG, "about to connect");
                    mBtAdapter.cancelDiscovery();
                    socket.connect();
                    Log.d(TAG, "Connected!");
                } catch (IOException e) {
                    Log.d(TAG, e.toString() + " " + e.getStackTrace().toString());
                }
            }
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.d(TAG, "ON PAUSE");
        try {
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "ON DESTROY");
        try {
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }




    @Override
    protected void onResume() {
        super.onResume();
        Log.d(TAG, "ON RESUME");
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
        try {
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}