android - 如何从 SimpleDraweeView 获取位图？

Question

我想从Fresco lib的SimpleDraweeView获取Bitmap，并保存到SD卡。SimpleDraweeView 是 ImageView 的子类，所以它应该支持 getDrawable() 但是调用这个方法会抛出 ClassCastException

BitmapDrawable bitmapDrawable = (BitmapDrawable) viewHolder.drawee.getDrawable();

ClassCastException: com.facebook.drawee.generic.RootDrawable cannot be cast to android.graphics.drawable.BitmapDrawable

这有什么出路？

Answer 1

莫里森提到的s1rius的回答对我有帮助。这是我使用的代码。

ImageRequest downloadRequest = ImageRequest.fromUri(uri);

CacheKey cacheKey = DefaultCacheKeyFactory.getInstance().getEncodedCacheKey(downloadRequest, context);

if (ImagePipelineFactory.getInstance().getMainFileCache().hasKey(cacheKey)) {
     BinaryResource resource = ImagePipelineFactory.getInstance().getMainFileCache().getResource(cacheKey);
     File cacheFile = ((FileBinaryResource) resource).getFile();
     File savedImageFile = new File(Constants.APP_PATH_SAVED_QUOTES, "M1iS1" + "_" + currentPosition + ".jpg");
}

然后我将 cacheFile 复制到 savedImageFile 中。