CODEWITHSUNDEEP
androidandroid-constraintlayout
idunnololz
idunnololz

Reputation: 8363

Chain with a barrier in ConstraintLayout

I want to achieve the layout below using a ConstraintLayout with no nesting.

enter image description here

The layout requires a barrier since it's not guaranteed which textview will be taller. It also requires a chain since everything needs to be centered. The issue is that I can't find a way to make chain work with barriers.

Here's what I have so far which will layout correctly but will not center:

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <TextView
        android:id="@+id/topLeftText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        tools:text="Test test test test test test test test test test"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/topRightText"/>

    <TextView
        android:id="@+id/topRightText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginBottom="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginEnd="16dp"
        tools:text="Test test test test test test test test test test test test test test test test test test test test"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toEndOf="@+id/topLeftText"
        app:layout_constraintEnd_toEndOf="parent"/>

    <android.support.constraint.Barrier
        android:id="@+id/barrier"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:constraint_referenced_ids="topLeftText,topRightText"
        app:barrierDirection="bottom"/>

    <TextView
        android:id="@+id/bottomText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        tools:text="Test test test test test test test test test test test test test test test test test test test test"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/barrier"/>

</android.support.constraint.ConstraintLayout>

If anyone knows how to achieve this, that would be much appreciated!

Upvotes: 42

Views: 2993

Answers (2)

Isidro Rodriguez
Isidro Rodriguez

Reputation: 475

Maybe you can use a guideline instead of a barrier. Let me know if this works for you:

Since you are not using androidx, make sure to replace androidx.constraintlayout.widget with android.support.constraint

<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="match_parent">

    <TextView
        android:id="@+id/topLeftText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        app:layout_constraintBottom_toTopOf="@id/guideline"
        app:layout_constraintEnd_toStartOf="@+id/topRightText"
        app:layout_constraintStart_toStartOf="parent"
        tools:text="Test test test test test test test test test test" />

    <TextView
        android:id="@+id/topRightText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        app:layout_constraintBottom_toTopOf="@id/guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/topLeftText"
        tools:text="Test test test test test test test test test test test test test test test test test test test test" />


    <TextView
        android:id="@+id/bottomText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/guideline"
        tools:text="Test test test test test test test test test test test test test test test test test test test test" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.5" />

</androidx.constraintlayout.widget.ConstraintLayout>

This is how it will look like

enter image description here

Upvotes: 0

Jakub S.
Jakub S.

Reputation: 6080

I know it's old but i think to do that without nesting, you have to change top component to something like this.

android:layout_height="wrap_content" android:layout_gravity="center"

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto">

Upvotes: 1

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