Question

我有自定义列表视图。在listview中包含200个项目。当我从上到下快速滚动或从下到上listview显示错误的图像。如果我慢慢滚动，那么它的工作正常。

XML中的SimpleDraweeView：

<com.facebook.drawee.view.SimpleDraweeView
            android:id="@+id/fake_image_list_group"
            android:layout_width="match_parent"
            android:layout_height="@dimen/note_list_item_height"
            android:background="@android:color/transparent"
            android:contentDescription="@string/app_name" />

将图像URI设置为SimpleDraweeView：

GenericDraweeHierarchy hierarchy = setHierarchyForDraweeView(mImageView, 300);
   hierarchy.setPlaceholderImage(new AsyncColorDrawable(context.getResources()));
   hierarchy.setFailureImage(mContext.getResources().getDrawable(R.drawable.broken_image_black));
   ImageRequest imageRequest = ImageRequestBuilder.newBuilderWithSource(Uri.fromFile(new File(mPath/*local path*/)))
           .setResizeOptions(new ResizeOptions(width, height))
           .setLocalThumbnailPreviewsEnabled(true)
           .build();
   DraweeController draweeController = Fresco.newDraweeControllerBuilder()
           .setImageRequest(imageRequest)
           .setOldController(mImageView.getController())
           .setAutoPlayAnimations(false)
           .build();
   mImageView.setController(draweeController);

SetHierarchyForDraweeView功能：

private GenericDraweeHierarchy setHierarchyForDraweeView(SimpleDraweeView draweeView, int duration) {
    if (draweeView != null) {
        if (draweeView.getHierarchy() == null) {
            GenericDraweeHierarchyBuilder builder = new GenericDraweeHierarchyBuilder(mContext.getResources());
            GenericDraweeHierarchy hierarchy = builder
                    .setFadeDuration(duration)
                    .setPlaceholderImage(new AsyncColorDrawable(mContext.getResources()))
                    .setFailureImage(mContext.getResources().getDrawable(R.drawable.broken_image_black))
                    .build();
            draweeView.setHierarchy(hierarchy);
        } else {
            GenericDraweeHierarchy hierarchy = draweeView.getHierarchy();
            hierarchy.setFadeDuration(duration);
            return hierarchy;
        }
    }
    return null;
}

AsyncColorDrawable类：

private class AsyncColorDrawable extends ColorDrawable {
    public AsyncColorDrawable(Resources res) {
        super(res.getColor(R.color.application_container_background_color));
    }
}

如果我做错了，请弄清楚。谢谢你的进步。

Answer 1

为此，您需要使用Universal Image Loader。它是一个智能且功能强大的库，可帮助在Android上加载，缓存和显示图像。看看this

Fresco：Listview在快速滚动时显示错误的图像

1 个答案: