How do I blur a gradient background?

Question

Lest say I have a gradient background like this right

Example:

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
        android:angle="90"
        android:startColor="#09203f "
        android:endColor="#537895"/>
</shape>

How do i blur it and make it look like this in the background of my layout?

Example: