> For the complete documentation index, see [llms.txt](https://elizacamber.gitbook.io/animations-2018/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://elizacamber.gitbook.io/animations-2018/solution-step-2.md).

# Step 2: Solution

## `activity_main.xml`

This is how your code should look by now

```
<?xml version="1.0" encoding="utf-8"?>
<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:context=".MainActivity">
    
    <android.support.constraint.Guideline
        android:id="@+id/guideline_verticalHalf"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.5"/>

    <android.support.constraint.Guideline
        android:id="@+id/guideline_horizontalHalf"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.5"/>

    <android.support.constraint.Guideline
        android:id="@+id/guideline_horizontal38"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.38" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_horizontal30"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.30" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_horizontal20"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.20" />

</android.support.constraint.ConstraintLayout>
```

{% hint style="info" %}
A vertical guideline has a width of zero and the height of their ConstraintLayout parent. A horizontal one has a height of zero and the width of their ConstraintLayout parent.

It doesn't matter if we're going to set the XML values of the width and height to `wrap_content`or `match_parent`&#x20;
{% endhint %}