Do guidelines in ConstraintLayout support RTL

Question

Do Guidelines in ConstraintLayout support RTL? I'm creating a View that has a profile picture and user info to its right. I want the picture to take 30% of the width while the username and details take 70%. Is this a valid use case for Guidelines? I am aware of other implementations but I was wondering whether or not guidelines can be used here. The problem I'm facing is that the guideline remains in it's position on the left after changing the devices language to a RTL language

screenshot

Here is the xml:

<?xml version="1.0" encoding="utf-8"?>
<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">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:background="@color/colorPrimary"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="24sp"
        tools:text="Full Name"
        app:layout_constraintTop_toTopOf="@+id/imageView"
        app:layout_constraintStart_toEndOf="@+id/guideline2" />

    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        tools:text="Android Developer"
        app:layout_constraintBottom_toBottomOf="@+id/imageView"
        app:layout_constraintStart_toEndOf="@+id/guideline2" />

    <android.support.constraint.Guideline
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/guideline2"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.30" />


</android.support.constraint.ConstraintLayout>

Answer 1

** UPDATE ** The bug on this issue is now marked as fixed by Google. ** END UPDATE **

It seems like the Android team missed this issue.

Percent is calculated from the left only.

So to support RTL you can declare a constant in values/dimens.xml, for example:

<resources>
     <item name="my_percent" format="float" type="dimen">0.3</item>
</resources>

And override this value with its 100-mypercent in values-ldrtl/dimens.xml file.

<resources>
     <item name="my_percent" format="float" type="dimen">0.7</item>
</resources>

Use it:

<android.support.constraint.Guideline
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/guideline2"
    android:orientation="vertical"
    app:layout_constraintGuide_percent="@dimen/my_percent" />

• If you prefer to re-write a complete layout version for RTL, you can skip declaring dimensions, and use layout-ldrtl/ directory for the RTL version.