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Android Threads and Services Introducing Services Creating a Service

can you help guys, ben deitch is confusing me, can some one please help, l am confused now

Challenge Task 2 of 3 Then override 'onStartCommand', and when started send a Message to your Thread's Handler to tell it to start updating!

public class TwitterService extends Service {
  TwitterClient twitterClient = new TwitterClient();  

  @Override public void onCreate() { 
    TwitterThread thread = new TwitterThread(); 
    thread.setName ("TwitterThread"); 

    while (thread.mHandler == null) {
    mHandler = thread.mHandler; 

    @Override public int onStartCommand(Intent itent , int flags , int startID) {
      Message message = Message.obtain(); 
      return Service.START_REDELIVER_INTENT;

@Override public IBinder onBind(Intent intent) { 
  return null; 

  class TwitterThread extends Thread {

    TwitterHandler twitterHandler;
    public void run() {
      twitterHandler = new TwitterHandler();

  class TwitterHandler extends Handler {
    public void handleMessage(Message msg) {
public class MainActivity extends Activity {
  Button button;   

  public void onCreate(Bundle savedInstanceState) {

    button = (Button) findViewById(R.id.update_button);
    button.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v){