Simple constraint layout child with max width in RecyclerView

user_826606 0
Viewed 756

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>

enter image description here



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.

enter image description here

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.

android-constraintlayout android-layout android
3 Answers

I have faced the same issue and i solve it by using RelativeLayout and set property android:maxWidth inside the TextView.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

       <TextView
            android:id="@+id/textViewChat"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:autoLink="all"
            android:gravity="start"
            android:linksClickable="true"
            android:maxWidth="256dp"
            android:padding="8dp"
            android:textColor="@color/black"
            android:textSize="14sp" />
</RelativeLayout>
user_46902980

I think your view is not getting redrawn during the recycling process. Check if you have 'setHasFixedSize=true' set for the recyclerview. Remove it or make it false. If it still does not work try changing the TextView width to wrap_content instead of 0dp.

user_107435840

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

user_113076300
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