Simple constraint layout child with max width in RecyclerView

Question

I am trying to create a TextView such that it wraps its content until it reaches its max width. Following code kind of achieves that perfectly until it is used in RecyclerView. It seems like TextView doesn't measure its width again after I change its text in onBindViewHolder().

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/message"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_max="wrap"
        app:layout_constraintWidth_default="percent"
        app:layout_constraintWidth_percent="0.72" />

</androidx.constraintlayout.widget.ConstraintLayout>

---

However notice how it works fine if I invoke requestLayout() on TextView in onBindViewHolder() below:

Update: Following code in onBindViewHolder() works too.

ConstraintSet().apply {
    clone(holder.parent)
    applyTo(holder.parent)
}

parent being ConstraintLayout.

Does anyone understand whats going on here? Is this a bug in ConstraintLayout? Invoking requestLayout() in onBindViewHolder() is a bad practice and I don't want to do that.

Answer 1

I know its month late, but I recently encountered this problem, and couldn't find an answer either. The changing ConstraintSet() posed by the author works, but always has the question in mind if this is efficient. Another solution is to change app:layout_constraintWidth_max="wrap" to app:layout_constraintWidth_default="wrap" That worked for me, the recyclerView updates the constraint correctly when recycling the view holders