bonjour,

j'ai un problème d'une méthode write de class bluetooth lorsque j'ai l'appeler dans un autre class
lorsque j'appuie sur le button elle m'affiche cette erreur
at dalvik.system.NativeStart.main(Native Method)
voila le code des deux class aidez moi SVP et merci d'avance
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public class Touch extends Activity implements OnClickListener {
 
    Button button;
    bluetooth bt;
 
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.touch);
                button =((Button)this.findViewById(R.id.button2));
                   button.setOnClickListener(this);
 
	}
 
	@Override
	public void onClick(View arg0) {
 
           bt.write("mon message");    
 
 
	}
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public class bluetooth extends Activity implements OnItemClickListener, OnClickListener {
    int conx=0;
    String msg="";
    public ConnectThread mConnectThread=null;
    public ConnectedThread mConnectedThread=null;
	ArrayAdapter<String> listAdapter;
	ListView listView;
	BluetoothAdapter btAdapter;
	Set<BluetoothDevice> devicesArray;
	ArrayList<String> pairedDevices;
	ArrayList<BluetoothDevice> devices;
    public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
	protected static final int SUCCESS_CONNECT = 0;
	protected static final int MESSAGE_READ = 1;
	public static final int Touchpad_begin = 10;
 
	IntentFilter filter;
	Button button;
	BroadcastReceiver receiver;
	String tag = "debugging";
	Souris_classique souris;
	 public  InputStream mmInStream=null;
	    public  OutputStream mmOutStream=null;
	    public  BluetoothSocket mmSocket=null; 	 
	Handler mHandler = new Handler(){
		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			Log.i(tag, "in handler");
			super.handleMessage(msg);
			switch(msg.what){
			case SUCCESS_CONNECT:
				// DO something
				 mConnectedThread = new ConnectedThread((BluetoothSocket)msg.obj);
				conx=1;
				Toast.makeText(getApplicationContext(), "CONNECT", 0).show();
 
 
				String s = "successfully connected";
 
				Log.i(tag, "connected");
 
				break;
			case MESSAGE_READ:
				byte[] readBuf = (byte[])msg.obj;
				String string = new String(readBuf);
				Toast.makeText(getApplicationContext(), string, 0).show();
				break;
			}
		}
	};
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bluetooth);
 
        init();
        if(btAdapter==null){
        	Toast.makeText(getApplicationContext(), "No bluetooth detected", 0).show();
        	finish();
        }
        else{
        	if(!btAdapter.isEnabled()){
        		turnOnBT();
        	}
 
        	getPairedDevices();
        	startDiscovery();
        }
 
 
    }
 
	public void startDiscovery() {
		// TODO Auto-generated method stub
		btAdapter.cancelDiscovery();
		btAdapter.startDiscovery();
 
	}
	public void turnOnBT() {
		// TODO Auto-generated method stub
		Intent intent =new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
		startActivityForResult(intent, 1);
	}
	public void getPairedDevices() {
		// TODO Auto-generated method stub
		devicesArray = btAdapter.getBondedDevices();
		if(devicesArray.size()>0){
			for(BluetoothDevice device:devicesArray){
				pairedDevices.add(device.getName());
 
			}
		}
	}
	public void init() {
		// TODO Auto-generated method stub
		listView=(ListView)findViewById(R.id.listView);
		listView.setOnItemClickListener(this);
		button = ((Button)this.findViewById(R.id.next));
        button.setOnClickListener(this);
		listAdapter= new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,0);
		listView.setAdapter(listAdapter);
		btAdapter = BluetoothAdapter.getDefaultAdapter();
		pairedDevices = new ArrayList<String>();
		filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
		devices = new ArrayList<BluetoothDevice>();
		receiver = new BroadcastReceiver(){
			@Override
			public void onReceive(Context context, Intent intent) {
				// TODO Auto-generated method stub
				String action = intent.getAction();
 
				if(BluetoothDevice.ACTION_FOUND.equals(action)){
					BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
					devices.add(device);
					String s = "";
					for(int a = 0; a < pairedDevices.size(); a++){
						if(device.getName().equals(pairedDevices.get(a))){
							//append 
							s = "(Paired)";
							break;
						}
					}
 
					listAdapter.add(device.getName()+" "+s+" "+"\n"+device.getAddress());
				}
 
				else if(BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){
					// run some code
				}
				else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
					// run some code
 
 
 
				}
				else if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)){
					if(btAdapter.getState() == btAdapter.STATE_OFF){
						turnOnBT();
					}
				}
 
			}
		};
 
		registerReceiver(receiver, filter);
		 filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
		registerReceiver(receiver, filter);
		 filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
		registerReceiver(receiver, filter);
		 filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
		registerReceiver(receiver, filter);
	}
	public void write(byte[] se) {
		ConnectedThread r;
		synchronized (this)
		{
			r=mConnectedThread;
		}
		r.write(se);
 
	}
 
	@Override
	public void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
		unregisterReceiver(receiver);
	}
 
		@Override
		public void onActivityResult(int requestCode, int resultCode, Intent data) {
			// TODO Auto-generated method stub
			super.onActivityResult(requestCode, resultCode, data);
			if(resultCode == RESULT_CANCELED){
				Toast.makeText(getApplicationContext(), "Bluetooth must be enabled to continue", Toast.LENGTH_SHORT).show();
				finish();
 
			}
 
		}
 
		public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
				long arg3) {
			// TODO Auto-generated method stub
 
			if(btAdapter.isDiscovering()){
				btAdapter.cancelDiscovery();
			}
			if(listAdapter.getItem(arg2).contains("Paired")){
 
				BluetoothDevice selectedDevice = devices.get(arg2);
				mConnectThread = new ConnectThread(selectedDevice);
				mConnectThread.start();
				Log.i(tag, "in click listener");
			}
			else{
				Toast.makeText(getApplicationContext(), "device is not paired", 0).show();
			}
 
		}
 
		public class ConnectThread extends Thread {
 
			private final BluetoothSocket mmSocket;
		    private final BluetoothDevice mmDevice;
 
		    public ConnectThread(BluetoothDevice device) {
		        // Use a temporary object that is later assigned to mmSocket,
		        // because mmSocket is final
		        BluetoothSocket tmp = null;
		        mmDevice = device;
		        Log.i(tag, "construct");
		        // Get a BluetoothSocket to connect with the given BluetoothDevice
		        try {
		            // MY_UUID is the app's UUID string, also used by the server code
		            tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
		        } catch (IOException e) { 
		        	Log.i(tag, "get socket failed");
 
		        }
		        mmSocket = tmp;
		    }
 
		    public void run() {
		        // Cancel discovery because it will slow down the connection
		        btAdapter.cancelDiscovery();
		        Log.i(tag, "connect - run");
		        try {
		            // Connect the device through the socket. This will block
		            // until it succeeds or throws an exception
		            mmSocket.connect();
 
 
		        } catch (IOException connectException) {	Log.i(tag, "connect failed");
		            // Unable to connect; close the socket and get out
		            try {
		                mmSocket.close();
		            } catch (IOException closeException) { }
 
 
		            return;
		        }
 
		        // Do work to manage the connection (in a separate thread)
 
		        mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
		    }
 
 
			/** Will cancel an in-progress connection, and close the socket */
		    public void cancel() {
		        try {
		            mmSocket.close();
		        } catch (IOException e) { }
		    }
		}
 
		public  class ConnectedThread extends Thread {
 
 
// Interface de gestion d'une liaison BT RFCOMM
 
		    public ConnectedThread(BluetoothSocket socket) {
		        mmSocket = socket;
		        InputStream tmpIn = null;
		        OutputStream tmpOut = null;
 
		        // Get the input and output streams, using temp objects because
		        // member streams are final
		        try {
		            tmpIn = socket.getInputStream();
		            tmpOut = socket.getOutputStream();
		        } catch (IOException e) { }
 
		        mmInStream = tmpIn;
		        mmOutStream = tmpOut;
		    }
 
		    public void run() {
		        byte[] buffer;  // buffer store for the stream
		        int bytes; // bytes returned from read()
 
		        // Keep listening to the InputStream until an exception occurs
		        while (true) {
		            try {
		                // Read from the InputStream
		            	buffer = new byte[1024];
		                bytes = mmInStream.read(buffer);
		                // Send the obtained bytes to the UI activity
		                mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
		                        .sendToTarget();
 
		            } catch (IOException e) {
		                break;
		            }
		        }
		    }
 
		    /* Call this from the main activity to send data to the remote device */
		    public void write(byte[] bytes) {
		        try {
		            mmOutStream.write(bytes);
		           mmOutStream.flush();
 
		        } catch (IOException e) { }
		    }
 
		    /* Call this from the main activity to shutdown the connection */
		    public void cancel() {
		        try {
		            mmSocket.close();
		        } catch (IOException e) { }
		    }
		}
 
 
		@Override
		public void onClick(View v) {
			if(conx==1)
			{
			 Intent intent = new Intent(this,ChoixView.class);
			 this.startActivityForResult(intent,1000);
 
			}
			else
			{Toast.makeText(getApplicationContext(), "Please connect to device", 0).show();}
 
		}
 
 
 
 
}