Apps UI hangs while sending data on bluetooth.

[tama]

Hello All,

This is my first post to this forum. I am new to android development. I am trying to write a client application which talk to server application via bluetooth. Server application is running on embedded platfrom.

I referred bluetoothchat example for bluetooth data transfer. In my application I have two activities, Main activity shows list of bluetooth devices and when a user clicks on one of the devices it will open a new activity. Then it will open a bluetooth socket start thread to connect to server. I have a message handler which talks to the connected thread.

my codes looks like this

[HIGH]
public class ConnectActivity extends Activity {

// Unique UUID for this application
public static final UUID MY_UUID_INSECURE = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

String address;
protected static final int SUCCESS_CONNECT = 0;
protected static final int MESSAGE_READ = 1;
protected static final int RECIEVE_MESSAGE = 2; // Status for Handler
public BluetoothSocket mmSocket;
public InputStream mmInStream;
public OutputStream mmOutStream;
String tag = "debugging";

private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
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
ConnectedThread connectedThread = new ConnectedThread((BluetoothSocket)msg.obj);
//Toast.makeText(getApplicationContext(), "CONNECT", 0).show();
String s = "successfully connected";
//connectedThread.write(s.getBytes());
connectedThread.write(s.getBytes());
Log.i(tag, "connected");
break;
case MESSAGE_READ:
byte[] readBuf = (byte[])msg.obj;
//String string = new String(readBuf, 0, msg.arg1);
Toast.makeText(getApplicationContext(), "Test", 0).show();
// Create the text view
//TextView textView = (TextView)findViewById(R.id.rcvedMsg);
//textView.setTextSize(40);
//textView.setText(string);
break;
case RECIEVE_MESSAGE:
byte[] readmsgBuf = (byte[])msg.obj;
String string = new String(readmsgBuf, 0, msg.arg1);
Toast.makeText(getApplicationContext(), "Test", 0).show();
// Create the text view
//TextView textView = (TextView)findViewById(R.id.rcvedMsg);
//textView.setTextSize(40);
//textView.setText(string);
break;
}
}
};
[/HIGH]

[HIGH] private class ConnectedThread extends Thread
{
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);
Log.d("MR", "input stream :"+(new String(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 {
//a delay of 20ms occurs after each flush...
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) { }
}
} [/HIGH]

method to write to data to bluetooth on pressing a button.

[HIGH] public void ledOff(View v ) throws IOException
{
//Toast.makeText(getApplicationContext(),"LED OFF", 0).show();
/* if (mmSocket != null)
try {
mmSocket.getOutputStream().write('f');
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
*/
if(mmOutStream != null)
{
mmOutStream.write('f');
}
}[/HIGH]

Some times my UI hangs when I click a button, it takes ages to respond back. In my method for ledOn I call bluetooth input stream. Is this correct method to do it.

Can some one please share some views on this.
Thanks

 

[steve]

Have you tried using an AsyncTask?