hi guys;
am a beginning in arduino and android… after one week i find a simple code who can help me to connect and send a message to arduino bluetooth module so this is the code:
package teste1.teste.adrian.myapplication;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.Menu;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.UUID;
public class MainActivity extends Activity {
List<BluetoothDevice> devices = new ArrayList<BluetoothDevice>();
BroadcastReceiver broadcastReceiver;
BluetoothAdapter bluetoothAdapter;
public UUID serverUuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB") ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(this, "Votre appareil n'a pas de Bluetooth", Toast.LENGTH_LONG).show();
finish();
}
if (!bluetoothAdapter.isEnabled()) {
Intent bluetoothIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(bluetoothIntent, 1);
}
Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
for (BluetoothDevice bluetoothDevice : pairedDevices)
{
devices.add(bluetoothDevice);
}
}
broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action))
{
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
devices.add(device);
}
}
};
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(broadcastReceiver, filter);
Intent dicoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
dicoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(dicoverableIntent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
protected void onDestroy() {
unregisterReceiver(broadcastReceiver);
super.onDestroy();
}
private class ConnectThread extends Thread {
BluetoothSocket socket;
BluetoothDevice device;
public ConnectThread(BluetoothDevice device) {
this.device = device;
BluetoothSocket socketTmp = null;
try {
socketTmp = device.createRfcommSocketToServiceRecord(serverUuid);
socket = socketTmp;
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void run() {
bluetoothAdapter.cancelDiscovery();
try {
socket.connect();
} catch (IOException e) {
try {
socket.close();
} catch (IOException e1) {
e1.printStackTrace();
}
e.printStackTrace();
return;
}
// TODO: Manage connection
super.run();
}
private void cancel() {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private class ConnectedThread extends Thread {
private BluetoothSocket bluetoothSocket;
InputStream inputStream = null;
OutputStream outputStream = null;
public ConnectedThread(BluetoothSocket socket) {
bluetoothSocket = socket;
InputStream inputStreamTmp = null;
OutputStream outputStreamTmp = null;
try {
inputStreamTmp = bluetoothSocket.getInputStream();
outputStreamTmp = bluetoothSocket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
inputStream = inputStreamTmp;
outputStream = outputStreamTmp;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = inputStream.read(buffer);
// TODO: Envoyer message à l'affichage
} catch (IOException e) {
e.printStackTrace();
break;
}
}
super.run();
}
public void write(byte[] bytes) {
try {
outputStream.write(bytes);
} catch (IOException e) {
e.printStackTrace();
}
}
public void cancel() {
try {
bluetoothSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
my problem is how i can using this code please ?
i know that i need to write this:
ConnectThread = new ConnectThread(devices);
ConnectThread.Start();
but i dont know where ill do that 
and how i can send a number like 0 or 1 or 2… ?
thanks to complet this code that i can use it