Nonda95

import kotlinx.coroutines.*

private val deferreds = mutableMapOf<String, Deferred<*>>()

@Suppress("UNCHECKED_CAST")
fun <T> doAsync(key: String, action: suspend () -> T): Deferred<T> {
    val deferredResult = deferreds[key]?.takeIf { it.isActive }
            ?: GlobalScope.async { action() }.also { deferreds[key] = it }
    return deferredResult as Deferred<T>
}

Nonda95

override fun onCreate(savedInstanceState: Bundle?) {
    ...
    window.sharedElementEnterTransition = TransitionSet()
            .addTransition(ChangeImageTransform())
            .addTransition(ChangeBounds())
            .apply {
                doOnEnd { detailImage.load(url) }
            }
}

Nonda95

override fun onCreate(savedInstanceState: Bundle?) {
    ...
    detailImage.load(url, loadOnlyFromCache = true) {
        supportStartPostponedEnterTransition()
    }
}

Nonda95

fun ImageView.load(url: String, onLoadingFinished: () -> Unit = {}) {
    ...
    val requestOptions = RequestOptions.placeholderOf(R.drawable.placeholder)
            .dontTransform()
    Glide.with(this)
            .load(url)
            .apply(requestOptions)
            .listener(listener)
            .into(this)
}

Nonda95

override fun onCreate(savedInstanceState: Bundle?) {
    ...
    supportPostponeEnterTransition()
    detailImage.load(url) {
        supportStartPostponedEnterTransition()
    }
}

Nonda95

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_detail)
    val url = intent.getStringExtra(IMAGE_URL_KEY)
    detailImage.transitionName = url
    detailImage.load(url)
}

Nonda95

fun goToDetails(url: String, imageView: View) {
    val options = ActivityOptionsCompat.makeSceneTransitionAnimation(this, imageView, imageView.transitionName).toBundle()
    Intent(this, DetailActivity::class.java)
            .putExtra(IMAGE_URL_KEY, url)
            .let {
                startActivity(it, options)
            }
}

Nonda95

fun ImageView.load(url: String) {
    Glide.with(this)
            .load(url)
            .apply(RequestOptions.placeholderOf(R.drawable.placeholder))
            .into(this)
}