Constraint layout with percentage not working as expected

I would make a view that is 70% wide and aligned to the right of its parent using layout constraints as follows

<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="wrap_content"
    >
    <android.support.constraint.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.3"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="Hello text"
        app:layout_constraintLeft_toRightOf="@+id/guideline"
        app:layout_constraintRight_toRightOf="parent"/>

</android.support.constraint.ConstraintLayout>

      

The TextView always occupies the full parent width. Any idea what I am doing wrong?

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1 answer


Two minor but important changes:

  • TextView width must be 0dp ie match constraint and not match parent
  • Leadership orientation should be vertical, not horizontal.

Here's the code:

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <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="0.3" />

    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Hello text"
        app:layout_constraintLeft_toRightOf="@id/guideline"
        app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

      



Output:

enter image description here

Also note that I changed the height of the ConstraintLayout to match_parent so that the guide is visible in the output. You can change it back to wrap_content.

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