[android-layout] This view is not constrained vertically. At runtime it will jump to the left unless you add a vertical constraint

New Layout editor in Android Studio 2.2 keeps showing this error on views like EditText and Buttons. kindly help.Also, any links that help in onboarding with the new constraint layout would be appreciated.

code:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    android:id="@+id/activity_main"
    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"
    tools:context="com.set.email.MainActivity"
    tools:layout_editor_absoluteX="0dp"
    tools:layout_editor_absoluteY="81dp">

    <TextView
        android:text="To:"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:layout_editor_absoluteX="7dp"
        tools:layout_editor_absoluteY="4dp"
        android:id="@+id/textTo"/>

    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:inputType="textEmailAddress"
        android:ems="10"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="24dp"
        android:id="@+id/editTo"
        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"/>

    <EditText
        android:layout_width="384dp"
        android:layout_height="42dp"
        android:inputType="textPersonName"
        android:ems="10"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="94dp"
        android:id="@+id/editSubject"
        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"/>

    <EditText
        android:layout_width="384dp"
        android:layout_height="273dp"
        android:inputType="textPersonName"
        android:ems="10"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="179dp"
        android:id="@+id/editMessage"
        app:layout_constraintLeft_toLeftOf="@+id/activity_main"
        tools:layout_constraintLeft_creator="50"
        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"/>

    <Button
        android:text="Send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:layout_editor_absoluteX="140dp"
        tools:layout_editor_absoluteY="454dp"
        android:id="@+id/btnSend"
        app:layout_constraintLeft_toLeftOf="@+id/editMessage"
        tools:layout_constraintLeft_creator="0"
        app:layout_constraintRight_toRightOf="@+id/activity_main"
        android:layout_marginEnd="16dp"
        tools:layout_constraintRight_creator="0"
        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"/>


</android.support.constraint.ConstraintLayout>

From Android Studio v3 and up, Infer Constraint was removed from the dropdown.

Use the magic wand icon in the toolbar menu above the design preview; there is the "Infer Constraints" button. Click on this button, this will automatically add some lines in the text field and the red line will be removed.

You have to change androidx.constraintlayout.widget.ConstraintLayout to RelativeLayout.

app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"

This help me a lot

Just copy this code to all components that you will drag.

app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"

example:

<TextView
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    android:text="To:"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteX="7dp"
    tools:layout_editor_absoluteY="4dp"
    android:id="@+id/textTo"/>

If Inferring the Constraints still gives you the error, just use this code:

app:layout_constraintBottom_toBottomOf="parent"

Go to the Design, right click on your Widget, Constraint Layout >> Infer Constraints. You can observe that some code has been automatically added to your Text.

Follow these steps:
Right click on designing part > Constraint Layout > Infer Constraints

Simply switch to the Design View, and locate the concerned widget. Grab the one of the dots on the boundary of the widget and join it to an appropriate edge of the screen (or to a dot on some other widget).

For instance, if the widget is a toolbar, just grab the top-most dot and join it to the top-most edge of the phone screen as shown in the image.

You need to drag the EditText from the edge of the layout and not just the other widget. You can also add constraints by just dragging the constraint point that surrounds the widget to the edge of the screen to add constraints as specified.

The modified code will look something similar to this:

    app:layout_constraintLeft_toLeftOf="@+id/router_text"
    app:layout_constraintTop_toTopOf="@+id/activity_main"
    android:layout_marginTop="320dp"
    app:layout_constraintBottom_toBottomOf="@+id/activity_main"
    android:layout_marginBottom="16dp"
    app:layout_constraintVertical_bias="0.29" 

for example I have this

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

use RelativeLayout layout like this

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

Go to the XML layout Text where the widget (button or other View) indicates error, focus the cursor there and press alt+enter and select missing constraints attributes.