NativeScript/apps/app/ui-tests-app/list-view/width-percent.xml

<Page xmlns="http://schemas.nativescript.org/tns.xsd" navigatingTo="onNavigatingTo" class="page">

    <Page.actionBar>
        <ActionBar title="My App" icon="" class="action-bar">
        </ActionBar>
    </Page.actionBar>

    <StackLayout>
        <StackLayout class="p-10" row="0">
            <ListView id="listView" items="{{ $value }}" height="300">
                <ListView.itemTemplate>
                    <StackLayout>
                        <Label width="50%" height="150" text="{{ $value }}" backgroundColor="green"/>
                    </StackLayout>
                </ListView.itemTemplate>
            </ListView>
        </StackLayout>
        <Button text="SCROLL" tap="onScroll" height="60"/>
    </StackLayout>
</Page>