Android TransitionManagerUtil

TransitionHelper.kt

import android.annotation.TargetApi
import android.support.v4.view.animation.FastOutSlowInInterpolator
import android.support.v7.widget.RecyclerView
import android.transition.ChangeBounds
import android.transition.Fade
import android.transition.Transition
import android.transition.TransitionManager
import android.transition.TransitionSet
import android.view.View
import android.view.ViewGroup
import android.webkit.WebView
import android.widget.ListView

@TargetApi(19)
object TransitionHelper {

    private const val DURATION_MS = 300L
    private val INTERPOLATOR = FastOutSlowInInterpolator()

    @JvmOverloads
    fun beginDelayedTransition(container: View, listener: Transition.TransitionListener? = null, transitionSet: TransitionSet = createDefaultTransitionSet(), vararg ignored: ViewGroup = arrayOf()) {
        if (container !is ViewGroup) {
            throw IllegalStateException("Expected ViewGroup, got " + container)
        }
        if (listener != null) {
            transitionSet.addListener(listener)
        }

        if (ignored.isNotEmpty()) {
            for (view in ignored) {
                transitionSet.excludeChildren(view, true)
            }
        }

        // Excluding all ListViews/RecyclerViews from animations. Generally no need to animate them + very dangerous to do so
        transitionSet.excludeTarget(ListView::class.java, true)
        transitionSet.excludeTarget(RecyclerView::class.java, true)
        transitionSet.excludeTarget(WebView::class.java, true)
        TransitionManager.beginDelayedTransition(container, transitionSet)
    }

    private fun createDefaultTransitionSet(): TransitionSet {
        val changeBounds = ChangeBounds().apply {
            duration = DURATION_MS
            interpolator = INTERPOLATOR
        }
        val fadeOut = Fade(Fade.OUT).apply {
            duration = DURATION_MS
            interpolator = INTERPOLATOR
        }
        val fadeIn = Fade(Fade.IN).apply {
            duration = DURATION_MS
            interpolator = INTERPOLATOR
        }
        return TransitionSet().apply {
            ordering = TransitionSet.ORDERING_TOGETHER
            addTransition(fadeOut)
            addTransition(changeBounds)
            addTransition(fadeIn)
        }
    }

    class TransitionListenerAdapter : Transition.TransitionListener {

        override fun onTransitionStart(transition: Transition) {}

        override fun onTransitionEnd(transition: Transition) {}

        override fun onTransitionCancel(transition: Transition) {}

        override fun onTransitionPause(transition: Transition) {}

        override fun onTransitionResume(transition: Transition) {}
    }
}