Headers help drivers understand which app and what part of the app they're
using. They need to be brief and easy to read at a glance while on the road.  
Headers must include at least one of the following: text, app icon, or back
button.

**Headers can include:**

- Icon or image (optional), such as app icon
- Text (limited to one line -- longer text is truncated), typically the title of the screen
- Refresh button (only on [Place List templates](https://developer.android.com/design/ui/cars/guides/templates/place-list-map-template))
- Back [button](https://developer.android.com/cars/design/create-apps/apps-for-drivers/components/button) (optional)

This example shows different types of headers you can create.
![4 examples of headers](https://developer.android.com/static/images/design/ui/cars/components/headers.png) This example shows different types of headers you can create.

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## Template support

You can use a header in all templates except the [Navigation template](https://developer.android.com/design/ui/cars/guides/templates/navigation-template). In
map-based templates, the header appears in the card. Otherwise, it incorporates
the optional [action strip](https://developer.android.com/design/ui/cars/guides/components/action-strip).