Artifacts used:
- androidx.appcompat:appcompat:1.0.2
- androidx.constraintlayout:constraintlayout:1.1.3

Version used: Android Q beta 1, but also on P, likely also lower
Theme used: AppCompat.Light
Devices/Android versions reproduced on:
- Pixel 3, Android Q beta
- Also in the layout designer

Note that I've also asked this as a question on StackOverflow:
https://stackoverflow.com/q/55186425/664955

Code to reproduce:


<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="600dp"
android:background="#0000FF">

<View
android:id="@+id/bottomGreenView"
android:layout_width="0dp"
android:layout_height="100dp"
android:background="#00FF00"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />

<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#FF0000"
app:layout_constrainedHeight="true"
app:layout_constraintHeight_max="0dp"
app:layout_constraintVertical_bias="0"
app:layout_constraintBottom_toTopOf="@id/bottomGreenView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:itemCount="1"
tools:listitem="@layout/test_list_item" />

</androidx.constraintlayout.widget.ConstraintLayout>


<androidx.constraintlayout.widget.ConstraintLayout
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"
android:background="#FFFFFF">

<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="15dp"
android:text="List item here"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

See issue.png for what the end-result looks like with the code above running on a Pixel 3 with Android Q beta 1. See expected.png for what I would expect the UI to look like.

I did manage to get this to work by changing the TextView's (in the list item) width to wrap_content instead of 0dp (MATCH_CONSTRAINT). However, that is not a viable option in many scenarios where there are elements on the right that should not overlap the text on the left. (The issue is also present if one constrain the TextView to another view on the right side.)

Interestingly, this does actually work as expected if I have the TextView's width `wrap_content` and remove its end-to-end constraint (the latter only so that it's not being centered horizontally). However, in my actual app I need these constraints as I also have content on the right side that I don't want to potentially overlap with long texts.

Issue 128646026

Links (15)

Issue metadata