percentage margin with constraintlayout?

Question

I'm learning how to use ConstraintLayout and have found a few good tutorials to have views width and height in percentage. I know I can probably add an empty view to 'create' margin, but it doesn't seem right. Is there a way to things like marginEnd='10%'?

Either use weights in LinearLayouts or use PercentRelativeLayouts. — Phantômaxx, Dec 18 '17 at 18:07
`PercentRelativeLayouts` is deprecated, so I wanted to try if `ConstraintLayout` can do the job — user1865027, Dec 18 '17 at 18:16
yes, guideline is what I'm using to set height and width for the view, but how can i apply that to margin? — user1865027, Dec 18 '17 at 18:16

score 57 · Accepted Answer · answered Dec 27 '17 at 20:25

There're two ways to add percentage margin using ConstraintLayout.

#1 Guideline

Simply add vertical guideline to your layout and constraint view to that guideline:

<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">

    <View
        android:id="@+id/view"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:background="@color/colorAccent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="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="0.9" />

</android.support.constraint.ConstraintLayout>

#2 Constraint weight

Add Space, place it on the very left side of parent, group your view and Space into "spread" chain and set app:layout_constraintHorizontal_weight="90" to your view and app:layout_constraintHorizontal_weight="10" to Space. It works very similar to LinearLayout's weight.

<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">

    <View
        android:id="@+id/view"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:background="@color/colorAccent"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintHorizontal_weight="90"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/space"
        app:layout_constraintBottom_toBottomOf="parent" />

    <Space
        android:id="@+id/space"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintHorizontal_weight="10"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toEndOf="@+id/view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent" />

</android.support.constraint.ConstraintLayout>

As a result, your view has end margin with value of 10% of parent width:

score 9 · Answer 2 · answered Sep 02 '18 at 06:18

9

Trick #3:

for the percentage from both sides

 app:layout_constraintWidth_percent=".80"

answered Sep 02 '18 at 06:18

amorenew

10,760
10
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3

Note: This is relative to parent size, not relative to arbitrary sides. – Enselic Apr 02 '20 at 12:15

CrandellWS · Answer 3 · 2021-03-06T22:58:11.467

You might want nested constraints with

app:layout_constraintWidth_percent="0.9"
    app:layout_constraintHorizontal_bias="0.25"

XML Example without bias:

<?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.ConstraintLayout
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:orientation="vertical"
        android:focusable="true"
        android:focusableInTouchMode="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintWidth_percent="0.9">
        <View
            android:id="@+id/view"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:background="@color/colorAccent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"/>
        </android.support.constraint.ConstraintLayout>

</android.support.constraint.ConstraintLayout>

Xml Example With bias

<?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.ConstraintLayout
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:orientation="vertical"
        android:focusable="true"
        android:focusableInTouchMode="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintWidth_percent="0.9"
        app:layout_constraintHorizontal_bias="0.25">
        <View
            android:id="@+id/view"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:background="@color/colorAccent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"/>
        </android.support.constraint.ConstraintLayout>

</android.support.constraint.ConstraintLayout>

https://developer.android.com/reference/androidx/constraintlayout/widget/ConstraintLayout#Bias

This should be the right answer. The bias between the start to the end of the parent — Oz Shabat, May 14 '20 at 16:01

percentage margin with constraintlayout?

3 Answers3

#1 Guideline

#2 Constraint weight