gradient-white
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <gradient
        android:startColor="@color/gradFirstGrey"
        android:centerColor="@color/gradMidGrey"
        android:endColor="@color/gradLastGrey"
        android:angle="270" />
</shape>
gradient-blue
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <gradient
        android:startColor="@color/colorPrimary"
        android:centerColor="@color/colorPrimaryDark"
        android:endColor="@color/gradMidBlue"
        android:angle="270" />
</shape>