code: @Override
      protected void onCreate(Bundle savedInstanceState)
      {
          setTheme(SampleList.THEME); //Used for theme switching in samples
          // Be sure to call the super class.
          super.onCreate(savedInstanceState);
  
          // See assets/res/any/layout/hello_world.xml for this
          // view layout definition, which is being set here as
          // the content of our screen.
          setContentView(R.layout.send_result);
  
          // Watch for button clicks.
          Button button = (Button)findViewById(R.id.corky);
          button.setOnClickListener(mCorkyListener);
          button = (Button)findViewById(R.id.violet);
          button.setOnClickListener(mVioletListener);
      }
docs: Initialization of the Activity after it is first created.  Must at least
  call {@link android.app.Activity#setContentView setContentView()} to
  describe what is to be displayed in the screen.