Android constraint layout barrier causing button cut at the end

Question

I am using constraint layout Barrier and this is my layout -

<?xml version="1.0" encoding="utf-8"?>
<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/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:text="abcdefghijklkkkkkkkkkkkfghjqwertzuiopasdfghhjkly"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:text="Button"
        app:layout_constraintStart_toEndOf="@id/barrier"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.constraintlayout.widget.Barrier
        android:id="@+id/barrier"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:barrierDirection="end"
        app:constraint_referenced_ids="textView" />
</androidx.constraintlayout.widget.ConstraintLayout>

This is what the resulting image looks like -

Answer 1

Based on the conversation on what exactly what the OP needs, constraint guideline will produce the intended result:

<?xml version="1.0" encoding="utf-8"?>
<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/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:text="abcdefghijklkkkkkkkkkkkfghjqwertzuiopasdfghhjklyabcdefghijklkkkkkkkkkkkfghjqwertzuiopasdfghhjklyabcdefghijklkkkkkkkkkkkfghjqwertzuiopasdfghhjklyabcdefghijklkkkkkkkkkkkfghjqwertzuiopasdfghhjkly"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="@id/guideline"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:text="Button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@id/guideline"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.8" />
</androidx.constraintlayout.widget.ConstraintLayout>

The above code produces the following if the text keeps growing, it ensures the button stays on the screen like the following:

If you don't want the button to be cut at the end & wrap instead, add an End constraint:

app:layout_constraintEnd_toEndOf="parent"

So your button xml should be like the following:

<Button
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:text="Button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/barrier"
        app:layout_constraintTop_toTopOf="parent" />

The resulting output will be like this:

Now if you want otherwise, like the button would remain/retain its own size and the textview will not, then set the barrier direction to start instead of end & pass button as constraint referenced ids instead of textview like the following:

<android.support.constraint.Barrier
    android:id="@+id/barrier"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:barrierDirection="start"
    app:constraint_referenced_ids="button" />