why android studio show error of "Missing constraints in constraintlayout"?

Question

picture

This view is not constrained, it only has design time positions, so it will jump to (0,0) unless you add constraints

The layout editor allows you to place widgets anywhere on the canvas, and it records the current position with design time attributes (such as layout_editor_absolute X.) These attributes are not applied at run time, so if you push your layout on a device, the widgets may appear in a different location than shown in the editor. To fix this, make sure a widget has both horizontal and vertical constraints by dragging from the edge connections

Answer 1

It is very simple to solve this problem. Just click on the widget (for example button or textbox, etc.) then click on the "Infer constraints" Button. You can see in the attached picture or this Youtube link: https://www.youtube.com/watch?v=uOur51u5Nk0

Answer 2

You might have widgets with attributes:

    tools:layout_editor_absoluteX="someValue"
    tools:layout_editor_absoluteY="someValue"

tools namespace is used at development time only, and will be removed while installing apk, so all you layouts might appear at position TOP-LEFT one above other. View Tools Attributes Reference

To fix this: You should make use of Layout Constraints like:

layout_constraintLeft_toLeftOf
layout_constraintLeft_toRightOf
layout_constraintRight_toLeftOf
layout_constraintRight_toRightOf
layout_constraintTop_toTopOf
layout_constraintTop_toBottomOf
layout_constraintBottom_toTopOf
layout_constraintBottom_toBottomOf
layout_constraintBaseline_toBaselineOf
layout_constraintStart_toEndOf
layout_constraintStart_toStartOf
layout_constraintEnd_toStartOf
layout_constraintEnd_toEndOf

You can go through the doc of ConstraintLayout and Build a Responsive UI with ConstraintLayout for more details

EDIT:

From the picture you posted, I tried to add appropriate constraints such that the TextView is in Center position using following code:

<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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

Answer 3

"Missing constraints in ConstraintsLayout".This error occurs due to the undefined Constraints.To fix this error click on the Widget(ex text,button etc) and then click on the infer constraints which is above the the activity screen.Hope this solves your query

Answer 4

enter image description here

First click on Linear layout in Component Tree and then click on infer constraints that is in right side from eye symbol in Activity Screen.

Answer 5

In case you do have valid constraints specified for your view, but Android Studio still shoves a "phantom" MissingConstraint error in your face, try these actions:

1. Clean your project (Build > Clean Project)
2. Close your project (File > Close Project)
3. Remove your project's .idea/ directory
   • If you check files from .idea/ into source control, roll them back
4. Open your project
5. Rebuild your project (Build > Rebuild Project)

This sacred purification ritual helped me get rid of this "phantom" error, as well as many other weird errors in the past, so I hope it helps you too.