Background color gradient. Place bg_gradient.xml in the drawable folder and give it a reference in the background attribute of the view in which you would like to use it in.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="bg_gradient_start">#303F9F</color>
<color name="bg_gradient_end">#FF4081</color>
</resources>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:angle="45"
android:startColor="@color/bg_gradient_start"
android:endColor="@color/bg_gradient_end"
android:type="linear"/>
</shape>