[Sony Cross-Device Development Themes and Apps] levone1:
Variation -

Status bar

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="90"
android:startColor="#1a000000"
android:endColor="#ff297aff"
android:type="linear" />
<size android:width="24dp"
android:height="24dp"/>
</shape>
</item>

<item
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp">
<shape android:shape="rectangle" >
<gradient
android:angle="90"
android:startColor="#1a121518"
android:endColor="#66121518"
android:centerColor="#d978909c"
android:type="linear" />
</shape>
</item>

</layer-list>

Nav bar

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="270"
android:startColor="#1a000000"
android:endColor="#ff297aff"
android:type="linear" />
<size android:width="24dp"
android:height="24dp"/>
</shape>
</item>

<item
android:bottom="2dp"
android:left="2dp"
android:right="2dp"
android:top="2dp">
<shape android:shape="rectangle" >
<gradient
android:angle="270"
android:startColor="#1a121518"
android:endColor="#66121518"
android:centerColor="#d978909c"
android:type="linear" />
</shape>
</item>

</layer-list>

- Screenshot 1 and 2 -

(Note - I don't think 'size' line is important here. I used it for something else, and just decided to leave it...)

Adjust as you like...

_____________

If you like rounded corners

Status bar

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="90"
android:startColor="#1a000000"
android:endColor="#ff297aff"
android:type="linear" />
[COLOR="red"]<corners android:topLeftRadius="20.0dip" android:topRightRadius="20.0dip" />[/COLOR]
</shape>
</item>

<item
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp">
<shape android:shape="rectangle" >
<gradient
android:angle="90"
android:startColor="#1a121518"
android:endColor="#66121518"
android:centerColor="#d978909c"
android:type="linear" />
[COLOR="red"]<corners android:topLeftRadius="20.0dip" android:topRightRadius="20.0dip" />[/COLOR]
</shape>
</item>

</layer-list>

(lines in red)

Nav bar

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="270"
android:startColor="#1a000000"
android:endColor="#ff297aff"
android:type="linear" />
[COLOR="red"]<corners android:bottomLeftRadius="20.0dip" android:bottomRightRadius="20.0dip" />[/COLOR]
</shape>
</item>

<item
android:bottom="2dp"
android:left="2dp"
android:right="2dp"
android:top="2dp">
<shape android:shape="rectangle" >
<gradient
android:angle="270"
android:startColor="#1a121518"
android:endColor="#66121518"
android:centerColor="#d978909c"
android:type="linear" />
[COLOR="red"]<corners android:bottomLeftRadius="20.0dip" android:bottomRightRadius="20.0dip" />[/COLOR]
</shape>
</item>

</layer-list>

- Screenshot 3 and 4 -