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Android Threads and Services Threads in Android Handle it!

I don't know what to put as a message.obj

I'm stuck in the message.obj, I don't know what to put as a message

MainActivity.java
public class MainActivity extends Activity {
  Button button;
  TwitterClient twitterClient = new TwitterClient();

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

    final TwitterThread twitterThread = new TwitterThread();
    twitterThread.setName("TwitterThread");
    twitterThread.start();

    button = (Button) findViewById(R.id.update_button);
    button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v){
        String client = "client 1";
        Message message = Message.obtain();
        message.obj = client;
        twitterThread.mHandler.sendMessage();
      }
    });
  }

  class TwitterThread extends Thread {
    TwitterHandler mHandler;

    @Override
    public void run() {
      Looper.prepare();
      mHandler = new TwitterHandler();
      Looper.loop();
    }
  }

  class TwitterHandler extends Handler{
    @Override
    public void handleMessage(Message msg){
        twitterClient.update();
    }
  }
}