Android PercentRelativeLayout width and height should be specified
<p>I'm trying to use <code>android.support.percent.PercentRelativeLayout</code>:</p>

<pre><code>&lt;ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"&gt;

    &lt;android.support.percent.PercentRelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white"&gt;

    &lt;ImageView
                app:layout_widthPercent="70%"
                app:layout_aspectRatio="1000%"
                app:layout_marginTopPercent="15%"
                android:layout_centerHorizontal="true"
                android:src="@drawable/logo"/&gt;
    &lt;/android.support.percent.PercentRelativeLayout&gt;
&lt;/ScrollView&gt;
</code></pre>

<p><strong>Android Studio gives me errors:</strong></p>

<pre><code>"layout_height should be specified
"layout_width should be specified"

Project is building now, but studio shows errors and do not suggest autocompletion when I start typing "percent..."
</code></pre>

<p>What am I doing wrong?</p>

<p><a href="https://developer.android.com/reference/android/support/percent/PercentRelativeLayout.html" rel="nofollow noreferrer">Here is</a> example from official site, why it's not working?</p>