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public void setAlphaWhenTouched(final View touchedView) {
  touchedView.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    v.setAlpha(0.3f);
    
                    break;
    
                case MotionEvent.ACTION_UP:
                case MotionEvent.ACTION_CANCEL:
                    v.setAlpha(1f);
    
                    break;
    
                default:
                    break;
            }
    
            return false;
        }
    });
}