ConstraintLayout Relative Distance In Percentage %

I am working with ConstraintLayout and I want to set a percentage margin top to the Textview Sample from the Button 2 placed at 52% of the screen. 3% is of course compared to the h

Solution 1:

After some research I finally found a workaround.

With the beta version of the ConstraintLayoutLibrary 1.1.0-beta you can define the height in a percent mode.

    app:layout_constraintHeight_default="percent"
    app:layout_constraintHeight_percent="0.03"

So I created an empty view for create space. Anyway, there isn't yet a method to define the marginTop in percent mode.

So for my specific case:

<?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">

    <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="0.5" />

    <Button
        android:id="@+id/button3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginTop="8dp"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_weight="10"
        android:background="#00FF00"
        android:text="SAMPLE"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/spaceView" />

    <View
        android:id="@+id/spaceView"
        android:layout_width="0dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:background="#FF0000"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent="0.03"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button4" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_marginTop="8dp"
        android:text="BUTTON 2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline" />

</android.support.constraint.ConstraintLayout>

Solution 2:

I copied your code and added a guideline and used it inside the TextView

<?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="horizontal"
        app:layout_constraintGuide_percent="0.5" />

    <android.support.constraint.Guideline
        android:id="@+id/text_view_guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.53" />

    <Button
        android:id="@+id/button3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginTop="8dp"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:layout_weight="10"
        android:background="#00FF00"
        android:text="SAMPLE"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button3"
        app:layout_constraintTop_toTopOf="@+id/text_view_guideline" />

</android.support.constraint.ConstraintLayout>

Solution 3:

You can do this without guide line. Just make sure to set the child of the ConstraintLayout to hold:

app:layout_constraintVertical_bias="0.52"
app:layout_constraintHeight_default="wrap"

For example, we can place a self sized container in screen location of 0.52 vertically:

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/content_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent">


        <androidx.appcompat.widget.LinearLayoutCompat
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintVertical_bias="0.52"
            app:layout_constraintHeight_default="wrap"
            >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="some text"/>


    </androidx.constraintlayout.widget.ConstraintLayout>