Android + Arduino Bluetooth Data Transfer

I can get my Android app to connect via Bluetooth to my Arduino. However no data can be transmitted between them. Below is my setup and code:

HTC Android v2.2, Bluetooth mate gold modem, Arduino Mega (ATmega1280)

Android Java code:

package com.example.BluetoothExample;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.TextView;
import android.widget.EditText;  
import android.widget.Button;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;

public class BluetoothExampleActivity extends Activity {
  TextView myLabel;
  EditText myTextbox;
  BluetoothAdapter mBluetoothAdapter;
  BluetoothSocket mmSocket;
  BluetoothDevice mmDevice;
  OutputStream mmOutputStream;
  InputStream mmInputStream;
  Thread workerThread;
  byte[] readBuffer;
  int readBufferPosition;
  int counter;
  volatile boolean stopWorker;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button openButton = (Button)findViewById(R.id.open);
    Button sendButton = (Button)findViewById(R.id.send);
    Button closeButton = (Button)findViewById(R.id.close);
    myLabel = (TextView)findViewById(R.id.label);
    myTextbox = (EditText)findViewById(R.id.entry);

    //Open Button
    openButton.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        try {
          findBT();
          openBT();
        }
        catch (IOException ex) { }
      }
    });

    //Send Button
    sendButton.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        try {
          sendData();