layout_constrainedWidth not working properly

Question

I’ve got EditText and TextView in my ConstraintLayout. TextView displays content of EditText.

On input I need EditText to expand untill the middle of the screen and TextView to follow it and fill the second half.

I set guideline at 50%, and use wrap_content и layout_constrainedWidth for both widgets.

Here is my xml:

<android.support.constraint.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="match_parent"
tools:context="com.manualuser.android.polygon.MainActivity">

<EditText
    android:id="@+id/editText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="16dp"
    android:inputType="textNoSuggestions"
    android:minWidth="1dp"
    android:scrollHorizontally="true"
    app:layout_constrainedWidth="true"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toLeftOf="@+id/guideline"
    app:layout_constraintTop_toTopOf="parent"/>

<HorizontalScrollView
    android:id="@+id/horizontalScrollView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_constrainedWidth="true"
    app:layout_constraintBottom_toBottomOf="@+id/editText"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toRightOf="@+id/editText"
    app:layout_constraintRight_toRightOf="parent">

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:maxLines="1"
        android:scrollHorizontally="true"
        android:singleLine="true"
        app:layout_constrainedWidth="true"
        app:layout_constraintBaseline_toBaselineOf="@+id/editText"
        app:layout_constraintEnd_toStartOf="@+id/textView"
        app:layout_constraintStart_toEndOf="@+id/editText"/>
</HorizontalScrollView>

<android.support.constraint.Guideline
    android:id="@+id/guideline"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    app:layout_constraintGuide_percent="0.5"/>

</android.support.constraint.ConstraintLayout>

What I get is when TextView reaches end of the screen it supersedes EditText to the left.

It works as needed when I set TextView layout_width to match_constraint. But how do I make it work with wrap_content?

Answer 1

I had a very similar issue. Basically what I observed is that it works weird when used with app:layout_constraintHorizontal_bias set to 0.0.

so if you change

app:layout_constraintHorizontal_bias="0.0"

to

app:layout_constraintHorizontal_bias="0.001"

It should work (at least it worked for me)

Please report it as a bug if you have time. It's an issue even in 2.0.0-beta2