[android-developers] Problem with threading....

In the code showed as below i create a process dialog for doing some long operation (in this case waiting

4 seconds)... It runs as it should. And shows the "Starting..." and "Done" message but when it finishes

and i click Button1 again it terminates. What am i doing wrong?

----- code -----

public class main extends Activity {

public ProgressDialog dialog = null;

final Handler handler = new Handler(){

public void handleMessage(Message msg){

dialog.dismiss();

TextView tv2 = (TextView) findViewById(R.id.TextView02);

tv2.setText("Done");

}

};

Thread runlongjob = new Thread(){

public void run(){

SystemClock.sleep(4000);

handler.sendEmptyMessage(0);

}

};

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

 

    }

    public void clickhandler(View v){

     switch(v.getId()){

     case (R.id.Button01):

TextView tv1 = (TextView) findViewById(R.id.TextView01);

     tv1.setText("Starting...");

     dialog = ProgressDialog.show(main.this, "Please wait", "Doing Job...", true);

     runlongjob.start();

     break;

     }

    }

  

}

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