Im creating a simple chat style recyclerview like messenger only super simplified. It all works perfectly, however when I add a lottie animation to show the other person is typing it causes a lot of instability in the recyclerview.
I used a scrollToPosition function when a new message is inserted so it will auto scroll down to the bottom and make the message visible. This bugs out when i add the lottie file, it wont scroll to the bottom properly maybe only half way down instead.
In addition I noticed when I move down the list the message from index 0 of the list will appear as the most recent index so its now duplicated. All these anomolies fix themselves when I remove the lottie animation from the xml. But I would like to have the ability to show a typing animation like every other chat application on the planet. If someone could help me understand what is going wrong I would be greatly appreciative.
Video snippet of scrollToPosition failing with lottie animation
To clarify when I remove the lottie animation from the xml the scrollToPosition works as intended and their is no unusual behaviour.
ViewHolder XML
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/_6sdp"
android:layout_marginTop="@dimen/_12sdp">
<ImageView
android:id="@+id/icon"
android:layout_width="@dimen/_24sdp"
android:layout_height="@dimen/_24sdp"
android:layout_marginStart="@dimen/_6sdp"
android:layout_marginBottom="4dp"
android:contentDescription="User Icon"
app:layout_constraintBottom_toBottomOf="@+id/messageCv"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/messageCv"
app:layout_constraintVertical_bias="1.0"
app:srcCompat="@drawable/feelingfit_app_icon_legacy_circular_v1" />
<!--<com.airbnb.lottie.LottieAnimationView
android:id="@+id/typingAnimation"
android:layout_width="@dimen/_30sdp"
android:layout_height="@dimen/_30sdp"
android:layout_marginStart="@dimen/_12sdp"
app:lottie_autoPlay="true"
app:lottie_loop="true"
app:lottie_repeatCount="3"
android:visibility="visible"
app:lottie_rawRes="@raw/typing"
app:lottie_cacheStrategy="strong"
app:layout_constraintBottom_toBottomOf="@+id/icon"
app:layout_constraintStart_toEndOf="@+id/icon"
app:layout_constraintTop_toTopOf="@+id/icon"
/>-->
<com.google.android.material.card.MaterialCardView
android:id="@+id/messageCv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="@dimen/_40sdp"
android:visibility="invisible"
app:cardBackgroundColor="@color/light_blue_50"
app:cardCornerRadius="@dimen/_10sdp"
app:cardElevation="0dp"
app:cardPreventCornerOverlap="false"
app:cardUseCompatPadding="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="@+id/icon"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:id="@+id/layout_gchat_container_other"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<com.google.android.material.textview.MaterialTextView
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/_6sdp"
android:maxWidth="@dimen/_230sdp"
android:paddingLeft="@dimen/_10sdp"
android:paddingTop="@dimen/_6sdp"
android:paddingRight="@dimen/_10sdp"
android:text="Message"
android:textColor="#000000"
android:textSize="@dimen/text_size_normal" />
</LinearLayout>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.textview.MaterialTextView
android:id="@+id/timestamp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/_10sdp"
android:layout_marginTop="@dimen/_4sdp"
android:layout_marginBottom="@dimen/_4sdp"
android:text="Today at 110:00pm"
android:textColor="#C0C0C0"
android:textSize="@dimen/_8sdp"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="@+id/messageCv"
app:layout_constraintTop_toBottomOf="@+id/messageCv" />
</androidx.constraintlayout.widget.ConstraintLayout>
ADAPTER
class ReplaceAndEmbraceAdapter
constructor(
private val dateUtil: DateUtil,
) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
private var messageList: MutableList<ReplaceAppModel> = mutableListOf()
private val appMessage: Int = 1
private val userMessage: Int = 2
inner class ChatDiffCallback(
private val oldList: List<ReplaceAppModel>,
private val newList: List<ReplaceAppModel>
) : DiffUtil.Callback() {
override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
return oldList[oldItemPosition] == newList[newItemPosition]
}
override fun getOldListSize(): Int = oldList.size
override fun getNewListSize(): Int = newList.size
override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
return oldList[oldItemPosition] == newList[newItemPosition]
}
}
fun addChat(list: List<ReplaceAppModel>) = apply {
val diffCallback = ChatDiffCallback(messageList, list)
val diffResult = DiffUtil.calculateDiff(diffCallback)
messageList.clear()
messageList.addAll(list)
diffResult.dispatchUpdatesTo(this)
}
/* fun addChat(list: List<ReplaceAppModel>) {
messageList = list
notifyItemInserted(messageList.size)
}*/
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
return when (viewType) {
appMessage -> {
MessageAppViewHolder(
RecyclerViewReplaceAndEmbraceAppBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
),
dateUtil
)
}
else -> MessageUserViewHolder(
RecyclerViewReplaceAndEmbraceUserBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
)
)
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
when (holder) {
is MessageAppViewHolder -> {
holder.bind(messageList?.get(position))
}
is MessageUserViewHolder -> {
holder.bind(messageList?.get(position))
}
}
}
override fun getItemCount(): Int {
return if (!messageList.isNullOrEmpty()) {
messageList!!.size
} else {
0
}
}
override fun getItemViewType(position: Int): Int = messageList[position].id
class MessageAppViewHolder
constructor(
private val binding: RecyclerViewReplaceAndEmbraceAppBinding,
private val dateUtil: DateUtil
) : RecyclerView.ViewHolder(binding.root) {
fun bind(item: ReplaceAppModel?) = with(itemView) {
binding?.apply {
typingAnimation.addAnimatorListener(object : Animator.AnimatorListener {
override fun onAnimationRepeat(animation: Animator?) {
}
override fun onAnimationEnd(animation: Animator?) {
typingAnimation.visibility = View.INVISIBLE
message.text =
HtmlCompat.fromHtml(item?.message!!, HtmlCompat.FROM_HTML_MODE_LEGACY)
icon.setImageResource(R.drawable.feelingfit_app_icon_legacy_circular_v1)
timestamp.text = dateUtil.getCurrentTimestampEDDMMMYYYYHHMM()
timestamp.visibility = View.VISIBLE
messageCv.visibility = View.VISIBLE
messageCv.fadeIn()
timestamp.fadeIn()
}
override fun onAnimationCancel(animation: Animator?) {
}
override fun onAnimationStart(animation: Animator?) {
}
})
}
}
}
from Adding Lottie animation to Android recyclerview leads to unstable results including views displaying in the wrong place and scrollToPosition bugging
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