README.md

Shared Element Transition Demo Kotlin

Android Shared element transition example in Kotlin from Fragment viewpager to Activity Fragment(Recyclerview) to Activity

Animation with Large image item	Animation with Small image item	Animation with Grid image List

To enable Shared element transition

Note that the shared element transitions require Android 5.0 (API level 21) and above and will be ignored for any lower API versions.

1. Enable Window Content Transitions

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
  <!-- other theme lines. -->

  // enable window content transition
  <item name="android:windowContentTransitions">true</item>
</style>

2. Assign a Common Transition Name

Assign a common transition name to the shared elements in both layouts. Use the android:transitionName attribute.

For e.g. in FirstActivity.xml OR list_layout.xml

<ImageView
         android:id="@+id/ivProfile"
         android:transitionName="profile"
         android:scaleType="centerCrop"
         android:layout_width="match_parent"
         android:layout_height="160dp" />

In DetailActivity.xml

<ImageView
         android:id="@+id/ivDetailProfile"
         android:transitionName="profile"
         android:scaleType="centerCrop"
         android:layout_width="match_parent"
         android:layout_height="250dp" />

3. Start Activity

Start the target activity by specifying a bundle of those shared elements and views from the source.

Single Shared Element

val detailIntent = Intent(mActivity, DetailActivity::class.java)
val imageViewPair = Pair.create<View, String>(imageView, getString("YourTransitionName"))
val options = ActivityOptionsCompat.makeSceneTransitionAnimation(mActivity, imageViewPair)

detailIntent.putExtra(LargeImageDetailActivity.DATA, data) // pass your bundle data
startActivity(detailIntent, options.toBundle())

Multiple Shared Element

val detailIntent = Intent(mActivity, LargeImageDetailActivity::class.java)
val imageViewPair = Pair.create<View, String>(imageView, "YourTransitionName")
val textViewPair = Pair.create<View, String>(textView, "YourTransitionName")
val options = ActivityOptionsCompat.makeSceneTransitionAnimation(mActivity, imageViewPair, textViewPair)

detailIntent.putExtra(LargeImageDetailActivity.DATA, data) // pass your bundle data
startActivity(detailIntent, options.toBundle())

Done! Just make sure that you don't have multiple views with same transition name in source or destination layout view.

To reverse the scene Transition animation

To reverse the scene transition animation when you finish the second activity, call the Activity.supportFinishAfterTransition()

Example :

override fun onOptionsItemSelected(item: MenuItem?): Boolean {
       if (item?.itemId == android.R.id.home) {
           //to reverse the scene transition animation
           supportFinishAfterTransition()
       }
       return super.onOptionsItemSelected(item)
}

References

• https://github.com/googlesamples/android-ActivitySceneTransitionBasic
• https://github.com/codepath/android_guides/wiki/Shared-Element-Activity-Transition

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