Here is how you can set angle in the background with this drawable code. But for that angle on the background, I will suggest a different way.
Way 1:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#43CEE0"/>
</shape>
</item>
<item
android:bottom="-100dp"
android:left="0dp"
android:right="-260dp"
android:top="270dp">
<rotate
android:fromDegrees="-10"
android:pivotX="0%"
android:pivotY="100%">
<shape
android:shape="rectangle">
<solid
android:color="@android:color/white"/>
</shape>
</rotate>
</item>
</layer-list>
Using this you can set the angle between view. But the angle will get disturbed on a different screen. When I use this on a big screen phone it simply not work effectively.
Another way is to get an image developed by the designer and set to the background. mdpi to xxxhdpi. In Android, you can refer above view to create an image.