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December 6, 2019 16:51
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Gist to showcase expanding/collpasing items
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override fun onBindViewHolder(holder: ListViewHolder, position: Int) { | |
val model = adapterList[position] | |
// set expand state on binded items because views are recycler | |
expandItem(holder, model == expandedModel, animate = false) | |
holder.cardContainer.setOnClickListener { | |
if (expandedModel == null) { | |
// expand clicked view | |
expandItem(holder, expand = true, animate = true) | |
expandedModel = model | |
} else if (expandedModel == model) { | |
// collapse clicked view | |
expandItem(holder, expand = false, animate = true) | |
expandedModel = null | |
} else { | |
// collapse previously expanded view | |
val expandedModelPosition = adapterList.indexOf(expandedModel!!) | |
val oldViewHolder = | |
recyclerView.findViewHolderForAdapterPosition(expandedModelPosition) as? ListViewHolder | |
if (oldViewHolder != null) expandItem(oldViewHolder, expand = false, animate = true) | |
// expand clicked view | |
expandItem(holder, expand = true, animate = true) | |
expandedModel = model | |
} | |
} | |
} |
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