code: public static void animate(View imageView, int durationMillis) {
  		if (imageView != null) {
  			AlphaAnimation fadeImage = new AlphaAnimation(0, 1);
  			fadeImage.setDuration(durationMillis);
  			fadeImage.setInterpolator(new DecelerateInterpolator());
  			imageView.startAnimation(fadeImage);
  		}
  	}
docs: Animates {@link ImageView} with "fade-in" effect
  
  @param imageView      {@link ImageView} which display image in
  @param durationMillis The length of the animation in milliseconds