Customize playback controls

AI-generated Key Takeaways

In addition to content organization, developers need to determine playback controls and queue implementation for their car apps.
Car makers provide basic playback controls; developers can add custom actions and queues for more functionality.
Custom action icons should be monochrome, vector-based, and dynamically change to reflect state for consistency and glanceability.
If implemented, queues should include an indicator for the currently playing item and might include thumbnails or elapsed time.
Developers should refer to linked resources for details on implementing custom actions and playback interface examples.

In addition to deciding how your app content is organized for navigating and browsing, you need to decide whether you want a queue or any custom controls for playing the content.

Car makers take care of implementing and styling the playback view, minimized control bar, and queue. They also provide a basic set of playback controls, including Play/Pause, Next, Previous, and Overflow. If these controls are sufficient for your app, then you’re done.

However, if you want to provide a queue or access to additional playback actions beyond the ones that car makers provide, you need to decide:

Whether to display thumbnails for queue items
Whether to display an icon or elapsed time for the currently playing item in the queue
Whether to include previously played items in the queue
Which custom actions you want on the control bar, and whether they should replace the car makers’ Next and Previous controls
What the icons representing the relevant states of each action (such as available and disabled) will look like

For examples of the playback interface, visit Playing media.

Playback control guidelines

Requirement level	Guidelines
MUST	App developers must: Provide monochrome (black or white) vector icons for any custom actions they add, and change them dynamically to indicate state
SHOULD	App developers should: If using text (including numbers) in an icon, utilize the maximum space in the bounding box to make the text as large and readable as possible
MAY	App developers may: Provide monochrome (black or white) vector icons for up to 8 custom actions

Rationale:

Consistent app UI: App developers need to align the interfaces for custom actions in media apps with similar actions familiar to their users on other devices.
Glanceability: Text can appear smaller when paired with iconography, so text in icons should be maximized within the available space.

Queue guidelines

The following considerations apply if you decide to implement a queue to allow users to view currently playing and upcoming content.

Requirement level	Guidelines
SHOULD	App developers should: Provide an indicator for the currently playing queue item Include previously played items in the queue
MAY	App developers may: Provide thumbnails for queue items Indicate the currently playing item with either an icon or by displaying elapsed time