Update GlideImage class to use modified URLs and DiskCacheStrategy
Modify all 20 URLs as described below:

Add 3 new constant properties to GlideImage class above your URLs:



    private val randomSiteIdentifier = "<RANDOM>"  // note < and > are illegal URL characters
    private val appScreenWidth = "<appscreenwidth>"
    private val appScreenHeight = "<appscreenheight>"


Now modify your URLs to use these new properties using <RANDOM> at the end of any URLs that link to sites that provide a random image on every https request, replace all width values with <appscreenwidth> and all height values with <appscreenheight> as shown below:

   "https://loremflickr.com/${appScreenWidth}/${appScreenHeight}$randomSiteIdentifier"
   "https://placebeard.it/${appScreenWidth}x${appScreenHeight}"


Add these three new properties for diskCacheStrategy, width and height under your URLs:



    // new properties
    private var diskCacheStrategy = DiskCacheStrategy.NONE
    private var width = 300
    private var height = 400



Update loadGlideImage() method with this code just above the actual load ( Glide.with ):



    var updatedUrl = url

    if (url.contains(randomSiteIdentifier)) {
        diskCacheStrategy = DiskCacheStrategy.NONE
        updatedUrl = url.replace(randomSiteIdentifier, "")
    } else {
        diskCacheStrategy = DiskCacheStrategy.ALL
    }

    updatedUrl = updatedUrl.replace(appScreenWidth, width.toString())
    updatedUrl = updatedUrl.replace(appScreenHeight, height.toString())



Modify the Glide.with statement to use these two new properties:

    Glide.with(context) // our context = the Activity
         .load(updatedUrl)
         .diskCacheStrategy(diskCacheStrategy)



Modify the rest of the code in Glide.with to use these two new properties:

.listener(object: RequestListener<Drawable>{
                override fun onLoadFailed(
                    e: GlideException?,
                    model: Any?,
                    target: Target<Drawable>?,
                    isFirstResource: Boolean
                ): Boolean {
                    progressBar.visibility = View.GONE
                    context.toast("Glide Load Failed: $updatedUrl")
                    return false
                }

                override fun onResourceReady(
                    resource: Drawable?,
                    model: Any?,
                    target: Target<Drawable>?,
                    dataSource: DataSource?,
                    isFirstResource: Boolean
                ): Boolean {
                    progressBar.visibility = View.GONE
                    imageView.setImageDrawable(resource)

                    lastURL = updatedUrl

                    sharedPreference.save(TheApp.context.getString(R.string.last_url_key), lastURL)

                    return false
                }
            })
            .into(imageView)