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The background drawable (shape) button will not be displayed if the application API is not 20+ (Android L)

In my Android app, I'm trying to set a simple ring shape as the background for my buttons. But as far as I try, the XML preview ignores the background drawing unless the API level is set to 20 (Android L)

What's happening? I am sure that people usually set the shapes for the buttons to L.

The code for my XML form for button_ring.xmlis located in the / drawables folder

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="ring" >
    <solid android:color="#4CD964" />
</shape>

and the code for my button defined in the layout folder

<Button
    android:id="@+id/button5"
    android:layout_weight="1"
    android:text="@string/five"
    android:tag="@string/five"
    style="@style/CustomButton"
    android:background="@drawable/button_ring" />

My Gradle Addiction

dependencies {
    compile 'com.android.support:support-v4:20.+'
}

and finally a video to see what I mean: Video

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