UI hangs while communicating while using bluetooth

1protected static final int SUCCESS_CONNECT = 0;
2 protected static final int MESSAGE_READ = 1;
3 protected static final int RECIEVE_MESSAGE = 2; // Status for Handler
4 public BluetoothSocket mmSocket;
5 public InputStream mmInStream;
6 public OutputStream mmOutStream;
7 String tag = "debugging";
8
9 private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
10 Handler mHandler = new Handler(){
11 @Override
12 public void handleMessage(Message msg)
13 {
14 // TODO Auto-generated method stub
15 Log.i(tag, "in handler");
16 super.handleMessage(msg);
17 switch(msg.what){
18 case SUCCESS_CONNECT:
19 // DO something
20 ConnectedThread connectedThread = new ConnectedThread((BluetoothSocket)msg.obj);
21 //Toast.makeText(getApplicationContext(), "CONNECT", 0).show();
22 String s = "successfully connected";
23 //connectedThread.write(s.getBytes());
24 connectedThread.write(s.getBytes());
25 Log.i(tag, "connected");
26 break;
27 case MESSAGE_READ:
28 byte[] readBuf = (byte[])msg.obj;
29 //String string = new String(readBuf, 0, msg.arg1);
30 Toast.makeText(getApplicationContext(), "Test", 0).show();
31 // Create the text view
32 //TextView textView = (TextView)findViewById(R.id.rcvedMsg);
33 //textView.setTextSize(40);
34 //textView.setText(string);
35 break;
36 case RECIEVE_MESSAGE:
37 byte[] readmsgBuf = (byte[])msg.obj;
38 String string = new String(readmsgBuf, 0, msg.arg1);
39 Toast.makeText(getApplicationContext(), "Test", 0).show();
40 // Create the text view
41 //TextView textView = (TextView)findViewById(R.id.rcvedMsg);
42 //textView.setTextSize(40);
43 //textView.setText(string);
44 break;
45 }
46 }

1private class ConnectedThread extends Thread
2 {
3 public ConnectedThread(BluetoothSocket socket)
4 {
5 mmSocket = socket;
6 InputStream tmpIn = null;
7 OutputStream tmpOut = null;
8
9 // Get the input and output streams, using temp objects because
10 // member streams are final
11 try {
12 tmpIn = socket.getInputStream();
13 tmpOut = socket.getOutputStream();
14 } catch (IOException e) { }
15
16 mmInStream = tmpIn;
17 mmOutStream = tmpOut;
18 }
19
20 public void run() {
21 byte[] buffer ; // buffer store for the stream
22 int bytes; // bytes returned from read()
23
24 // Keep listening to the InputStream until an exception occurs
25 while (true) {
26 try {
27 // Read from the InputStream
28 buffer = new byte[1024];
29 bytes = mmInStream.read(buffer);
30 Log.d("MR", "input stream :"+(new String(buffer)));
31 // Send the obtained bytes to the UI activity
32 mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();
33 } catch (IOException e) {
34 break;
35 }
36 }
37 }
38
39 /* Call this from the main activity to send data to the remote device */
40 public void write(byte[] bytes) {
41 try {
42 //a delay of 20ms occurs after each flush...
43 mmOutStream.write(bytes);
44 mmOutStream.flush();
45 } catch (IOException e) { }
46 }
47
48 /* Call this from the main activity to shutdown the connection */
49 public void cancel() {
50 try {
51 mmSocket.close();
52 } catch (IOException e) { }
53 }
54 }

1public void ledOff(View v ) throws IOException
2 {
3 //Toast.makeText(getApplicationContext(),"LED OFF", 0).show();
4/* if (mmSocket != null)
5 try {
6 mmSocket.getOutputStream().write('f');
7 } catch (IOException e) {
8 // TODO Auto-generated catch block
9 e.printStackTrace();
10 }
11*/
12 if(mmOutStream != null)
13 {
14 mmOutStream.write('f');
15 }
16 }