Android的排球 - 如何动画图像加载？ [英] Android Volley - how to animate image loading?

问题描述

任何想法如何发挥淡入动画时，图像加载？的现在，它只是闪烁到位。我使用NetworkImageView从凌空工具包。

any idea how to play a fade in animation when image loads? Now it just blinks into place. I am using NetworkImageView from the Volley toolkit.

此外，有没有一种方法来设置网络上的图像视图加载和错误的位图，而无需使用ImageLoader.get（..）？

Also, is there a way to set loading and error bitmaps on the network image view without using the ImageLoader.get( .. ) ?

谢谢！

//修改：好了，感谢你的一切，但如果我们想成为完美主义者，我们应该只当负载从磁盘高速缓存，覆盖setImageBitmap将区分动漫走下车动画即使从拉的内存缓存

您想要做的就是添加一个布尔值 shouldAnimate 来ImageListener.onResponse这样

what you want to do is add a boolean shouldAnimate to ImageListener.onResponse like this

public static ImageListener getImageListener(final ImageView view, final int defaultImageResId,
        final int errorImageResId) {
    return new ImageListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            if (errorImageResId != 0) {
                view.setImageResource(errorImageResId);
            }
        }

        @Override
        public void onResponse(ImageContainer response, boolean isImmediate, boolean shouldAnimate) {
            if (response.getBitmap() != null) {
                if (shouldAnimate) {
                    // ADDED
                    view.setAlpha(0f);
                    view.setImageBitmap(response.getBitmap());
                    view.animate().alpha(1f).setDuration(1000);
                    // END ADDED
                } else {
                    view.setImageBitmap(response.getBitmap());
                }
            } else if (defaultImageResId != 0) {
                view.setImageResource(defaultImageResId);
            }
        }
    };
}

这是一个设置位图，无论是从方法，所以你需要将其设置为false，以在ImageLoader的每次使用时，除了

this is a method that sets the bitmap, no matter where it is from, so you need to set it to false to every usage in ImageLoader except for

class BatchedImageRequest {

   private void batchResponse(String cacheKey, BatchedImageRequest request,
        final VolleyError error) {
      ...
      container.mListener.onResponse(container, false, true);
      ...
   }
}

我创建了一个要点进行复制和;粘贴的用法 - <一个href="https://gist.github.com/ursusursus/5732521">https://gist.github.com/ursusursus/5732521

推荐答案

例实施CommonsWare的答案可以在这里找到：的https：/ /gist.github.com/benvd/5683818 。

Example implementation of CommonsWare's answer can be found here: https://gist.github.com/benvd/5683818.

使用透支的 TransitionDrawable 并添加一个额外的层。如果你想避免这种情况，多半是使用 ViewPropertyAnimator 可能的帮助。

Using a TransitionDrawable does add an extra layer of overdraw. If you want to avoid that, perhaps using a ViewPropertyAnimator might help.

它的要点基本上是在下面的代码片断你的 setImageBitmap（）：

The gist of it is basically to have the following snippet in your setImageBitmap():

TransitionDrawable td = new TransitionDrawable(new Drawable[]{
        new ColorDrawable(android.R.color.transparent),
        new BitmapDrawable(getContext().getResources(), bm)
});

setImageDrawable(td);
td.startTransition(FADE_IN_TIME_MS);

这篇关于Android的排球 - 如何动画图像加载？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！