android connect to bluetooth

public void checkIfBluetoothOpen(View view) {

       BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
       if (mBluetoothAdapter == null) {
           // Device does not support Bluetooth
           AlertDialog.Builder builder=new AlertDialog.Builder(this);
           builder
           .setIcon(android.R.drawable.ic_dialog_alert)
           .setTitle("Sorry!")
           .setMessage("Your device does not support bluetooth.")
           .setPositiveButton("OK", null)
           .show();
       }
       else
       {
           if (!mBluetoothAdapter.isEnabled()) {

               // Bluetooth is close
                Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                   startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
           }

           Set<bluetoothdevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
           // If there are paired devices
           if (pairedDevices.size() > 0) {
               // Loop through paired devices
               for (BluetoothDevice device : pairedDevices) {
                   // Add the name and address to an array adapter to show in a ListView
                   mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
               }
           }
           // Create a BroadcastReceiver for ACTION_FOUND
           final BroadcastReceiver mReceiver = new BroadcastReceiver() {
               public void onReceive(Context context, Intent intent) {
                   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);
                       // Add the name and address to an array adapter to show in a ListView
                       mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
                   }
               }
           };
           // Register the BroadcastReceiver
           IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
           registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy

           Intent discoverableIntent = new
           Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
           discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
           startActivity(discoverableIntent);
       }
   }</bluetoothdevice>