Android-Create Button selector programatically

StateListDrawable stateListDrawable = new StateListDrawable();
stateListDrawable.addState(new int[] {android.R.attr.state_pressed}, 
      getResources().getDrawable(R.drawable.phone));

stateListDrawable.addState(new int[] {}, 
      getResources().getDrawable(R.drawable.normalImage));