Socket Client - how to

Question

I am in an Android project which uses Bluetooth sockets. The app is the client socket. But the app crashes when working. Can anyone help me in solving the issue.

here is the code

public class READ extends AppCompatActivity {
    private static String btAdress = "00:10:60:D1:95:CD";
    BluetoothSocket mmSocket;
    BluetoothDevice mmDevice;
    BluetoothAdapter btAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_read);
    }
    public void ConnectThread(View v){
        BluetoothDevice device;
        device = btAdapter.getRemoteDevice(btAdress);
        ConnectT(device);
    }
    public void ConnectT(BluetoothDevice device) {
        // Use a temporary object that is later assigned to mmSocket,
        // because mmSocket is final
        mmDevice = device;
        BluetoothSocket tmp = null;
        String uuid = "a60f35f0-b93a-11de-8a39-08002009c666";
        // 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(UUID.fromString(uuid));
        } catch (IOException e) { }
        mmSocket = tmp;
        try {
            // Connect the device through the socket. This will block
            // until it succeeds or throws an exception
            mmSocket.connect();
        } catch (IOException nullException) {
            // Unable to connect; close the socket and get out
            try {
                mmSocket.close();
            } catch (IOException closeException) { }
        }
    }
}

Thanks in Advance.