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Android Threads and Services Threads in Android Handle it!

.obj symbol not recognized error

The system is saying the obj is not a recognised symbol when I use it with messages.

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){
        Message msg = Message.obtain();
        msg.obj = twitterClient;
        //twitterThread.
      }
    });
  }

  class TwitterThread extends Thread {
    TwitterHandler th;
    @Override
    public void run() {
      Looper.prepare();
      th = new TwitterHandler();
      Looper.loop();
      //twitterClient.update();
    }
  }
  class TwitterHandler extends Handler {
    @Override
    public void handleMessage(Message msg) {
       twitterClient.update();      
    }
    // move the call to 'twitterClient.update()' into this new Handler's 'handleMessage' method.
  }
}