Support pluggable asynchronous image loading.

[code-beans]

So in my project I have a listview with icons. I integrated the unity game engine in my project which will render icons and return an encoded png in form of a byte array.

I have a bridge between android and the unity side. In essence it accepts a static call via public static void GetIcon(OnImageReceived onImageReceived,JSONObject json) {..}

with the callback having this signature

public interface OnImageReceived {

    public void ImageReceived(byte[] bytes);

}

the json just holds additional render info specific to that icon being rendered. The callback will be invoked 40ms later or a second later or worst case never. So how do I make picasso load these icons properly and meanwhile show a placeholder image? I tried to follow this example using a custom downloader but couldn't really get things up an running. Then I tried to follow this issue but all links are pretty much dead. So can you point me in the right direction? Do I need a custom downloader or taget?

I am using a custom adapter and load the image into an ImageView in the getView(int position, View view, ViewGroup parent) method of the adapter. Ideally I would like to cache the icons in the cache folder of the internal storage using a hash of that json.

Thanks

[JakeWharton]

We have no way to asynchronously load an image at this time. Downloaders are required to be synchronous for now.

This is something we potentially can address is a version 3.

[NightlyNexus]

Open to contributions for this?

[JakeWharton]

Yes

[JakeWharton]

We need to make pluggable bitmap/drawable factories async to support OkHttp's enqueue API. But I'd also like to support pushing multiple instances through the async pipeline to handle things like progressive jpg. Going to dupe a request for that onto this.

[NightlyNexus]

I have not caught up on all the context yet, but multiple instances of what?

[JakeWharton]

images

On Sat, Mar 3, 2018 at 12:53 AM Eric Cochran notifications@github.com wrote:

I have not caught up on all the context yet, but multiple instances of what?

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