【Android】 ImageView 图片切换效果

ImageView banner = (ImageView) findViewById(R.id.bannerView);
Drawable[] layers = new Drawable[2];
TransitionDrawable transitionDrawable;

layers[0] = getResources().getDrawable(R.drawable.banner_v1);
layers[1] = getResources().getDrawable(R.drawable.banner_v2);
transitionDrawable = new TransitionDrawable(layers);
banner.setImageDrawable(transitionDrawable);                               
transitionDrawable.startTransition(600);