How to implement shared transition element from RecyclerView item to Fragment with Android Navigation Component?

Question

I have a pretty straightforward case. I want to implement shared element transition between an item in recyclerView and fragment. I\'m using androi

Answer 1

Here is my example with RecyclerView that have fragment shared transition. In my adapter i am setting different transition name for each item based on position(In my example it is ImageView).

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    val item = items[position]
    holder.itemView.txtView.text=item
    ViewCompat.setTransitionName(holder.itemView.imgViewIcon, "Test_$position")
    holder.setClickListener(object : ViewHolder.ClickListener {
        override fun onClick(v: View, position: Int) {
            when (v.id) {
                R.id.linearLayout -> listener.onClick(item, holder.itemView.imgViewIcon, position)
            }
        }
    })

}

And when clicking on item, my interface that implemented in source fragment:

override fun onClick(text: String, img: ImageView, position: Int) {
    val action = MainFragmentDirections.actionMainFragmentToSecondFragment(text, position)
    val extras = FragmentNavigator.Extras.Builder()
            .addSharedElement(img, ViewCompat.getTransitionName(img)!!)
            .build()
    NavHostFragment.findNavController(this@MainFragment).navigate(action, extras)
}

And in my destination fragment:

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    info("onCreate")
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        sharedElementEnterTransition = TransitionInflater.from(context).inflateTransition(android.R.transition.move)
    }
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    info("onCreateView")
    return inflater.inflate(R.layout.fragment_second, container, false)
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    info("onViewCreated")
    val name=SecondFragmentArgs.fromBundle(arguments).name
    val position=SecondFragmentArgs.fromBundle(arguments).position
    txtViewName.text=name
    ViewCompat.setTransitionName(imgViewSecond, "Test_$position")
}