Glide 4 - ResourceDecoder on specific call

Question

After going through all Glide documentation and StackOverflow questions and answers, I cannot find any information regarding applying resource decoder for a single Glide call in version 4.

In version Glide 3, we can do this:

Glide.with(imagePreview.context)
          .load(mediaItem.path)
          .asBitmap()
          .decoder(decoderWithDownSampleAtMost(imagePreview.context))
          .diskCacheStrategy(DiskCacheStrategy.NONE)
          .skipMemoryCache(false)
          .dontAnimate()
          .into(target)

private fun decoderWithDownSampleAtMost(ctx: Context): GifBitmapWrapperResourceDecoder {
    return GifBitmapWrapperResourceDecoder(
        ImageVideoBitmapDecoder(StreamBitmapDecoder(Downsampler.AT_MOST,
            Glide.get(ctx).bitmapPool,
            DecodeFormat.DEFAULT),
            FileDescriptorBitmapDecoder(ctx)),
        GifResourceDecoder(ctx),
        Glide.get(ctx).bitmapPool)
  }

And in version 4, I know we can use AppGlideModule for custom ResourceDecoder

@GlideModule
class MyAppGlideModule : AppGlideModule() {
    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
        registry.prepend(String::class.java, Bitmap::class.java, GalleryDecoder(context))
    }
}

However, this applies to all Glide calls. How can I make ResourceDecoder behave like v3: the ability to apply on individual call?

---

UPDATE: I'm able to draw out a solution for this one after consulting on Glide Github Issues here https://github.com/bumptech/glide/issues/3522

So basically, I need to create a custom Option and use it to determine whether my custom ResourceDecoder will be triggered. Here is my sample:

• Normal AppGlideModule

@GlideModule
class MyAppGlideModule : AppGlideModule() {
    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
        registry.prepend(Any::class.java, Bitmap::class.java, MainActivity.GalleryDecoder(context, glide.bitmapPool))
    }
}

• In my Activity:

class MainActivity : AppCompatActivity() {

    companion object {
        val GALLERY_DECODER: Option<Boolean> = Option.memory("abc")
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        GlideApp.with(this)
            .asBitmap()
            .load("link_or_path_here")
            .apply(option(GALLERY_DECODER, true))
            .into(image_view)

    }
}

• My GalleryDecoder:

open class GalleryDecoder(
        private val context: Context,
        private val bitmapPool: BitmapPool
    ) : ResourceDecoder<Any, Bitmap> {

        override fun decode(source: Any, width: Int, height: Int, options: Options): Resource<Bitmap>? {
            return BitmapResource.obtain(BitmapFactory.decodeResource(context.resources, R.drawable.giphy), bitmapPool)
        }

        override fun handles(source: Any, options: Options): Boolean = options.get(GALLERY_DECODER) ?: false

    }

That's it, if you don't want to use GalleryDecoder, just remove .apply(option(GALLERY_DECODER, true)) from Glide load. Cheers!

Answer 1

I think that you can do with :

GlideApp.with(mContext)
        // TRY With below line....
        .setDefaultRequestOptions(new GlideOptions().decode(Class<T> class))
        .load(R.drawable.ic_loader)
        .into(imageView);

I think you have to pass your class object. I haven't tried but I think it will work.