Android PercentRelativeLayout width and height should be specified

Question

I'm trying to use android.support.percent.PercentRelativeLayout:

<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">

    <android.support.percent.PercentRelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white">

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

Android Studio gives me errors:

"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..."

What am I doing wrong?

Here is example from official site, why it's not working?

Answer 1

The question was answered here : PercentRelativeLayout - layout_width missing warning

Basically; width and height are ignored by PercentRelativeLayout, but you need to set them to 0dp, because Android Studio expects them to be here.