Add Event to Button - onClickListener

public class ButtonClickActivity extends Activity {

  private Button m_button;
    /** Called when the activity is first created. */
    @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
     
  LinearLayout m_linear = new LinearLayout(this);
  m_linear.setOrientation(LinearLayout.VERTICAL);
     
  m_button = new Button(this);
  m_button.setText("Hello World");
     
  m_button.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View arg0) {

  m_button.setText("click");

            }
  });
     
  m_linear.addView(m_button);
  setContentView(m_linear);
    }
}