使用TransitionDrawable实现渐变效果，, private

使用TransitionDrawable实现渐变效果，, private

    private void setImageBitmap(ImageView imageView, Bitmap bitmap) {          final TransitionDrawable td = new TransitionDrawable(new Drawable[] {                  new ColorDrawable(android.R.color.transparent),                  new BitmapDrawable(getResources(), bitmap) });          imageView.setBackgroundDrawable(imageView.getDrawable());          imageView.setImageDrawable(td);          td.startTransition(200);      }