QuickControlsFragment.java 文件源码

@Override
protected void onPostExecute(Drawable result) {
    if (result != null) {
        if (mBlurredArt.getDrawable() != null) {
            final TransitionDrawable td =
                    new TransitionDrawable(new Drawable[]{
                            mBlurredArt.getDrawable(),
                            result
                    });
            mBlurredArt.setImageDrawable(td);
            td.startTransition(400);

        } else {
            mBlurredArt.setImageDrawable(result);
        }
    }
}