ConstraintLayout Problems using <include> : <p>I am trying to figure out why this does not work. I am adding nothing but two <code>&lt;include&gt;</code> sections in a <code>ConstraintLayout</code> and the layout is not following any of the constraints that I set up. I am trying to begin migrating to the use of <code>ConstraintLayout</code> as my go-to layout, but things like this keep pushing me back to <code>RelativeLayout</code> and <code>LinearLayout</code>.</p>

<p>Here is the top level layout file (the ConstraintLayout), showing some of the constraints that are not working:</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;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"
    tools:layout_editor_absoluteY="81dp"
    tools:layout_editor_absoluteX="0dp"&gt;

    &lt;include
        android:id="@+id/includeButton"
        layout="@layout/include_button_panel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent" /&gt;

    &lt;include
        android:id="@+id/includeText"
        layout="@layout/include_text_panel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent" /&gt;

&lt;/android.support.constraint.ConstraintLayout
</code></pre>

<p>Here is the first included layout (include_button_panel):</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;merge
    xmlns:android="http://schemas.android.com/apk/res/android"&gt;

    &lt;Button
        android:id="@+id/include_button_panel_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Touch me!" /&gt;

&lt;/merge&gt;
</code></pre>

<p>Here is the second included layout (include_text_panel):</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;merge
    xmlns:android="http://schemas.android.com/apk/res/android"&gt;

    &lt;TextView
        android:id="@+id/include_text_panel_text"
        android:layout_width="wrap_content"
        android:background="#7986cb"
        android:layout_height="wrap_content"
        android:text="This is the text panel"
        android:textColor="@android:color/black"
        android:textSize="18sp" /&gt;
&lt;/merge&gt;
</code></pre>
