解决代码：.transition(DrawableTransitionOptions.with(drawableCrossFadeFactory))
DrawableCrossFadeFactory drawableCrossFadeFactory = new DrawableCrossFadeFactory.Builder(300).setCrossFadeEnabled(true).build();
Glide.with(this)
.load(URL_JPG)
.apply(new RequestOptions().placeholder(R.drawable.ic_launcher))
.transition(DrawableTransitionOptions.with(drawableCrossFadeFactory))
.into(imageView);
