Row.Builder

public Builder()

Returns an empty Builder instance.

@RequiresCarApi(value = 6)
public @NonNull Row.Builder addAction(@NonNull Action action)

Adds an additional action to the end of the row. Note: From Car API 8 onwards, Rows are allowed to have 2 max actions to be set.

public @NonNull Row.Builder addText(@NonNull CarText text)

Adds a text string to the row below the title, with support for multiple length variants.

public @NonNull Row.Builder addText(@NonNull CharSequence text)

Adds a text string to the row below the title.

The text can be customized with ForegroundCarColorSpan, androidx.car.app.model.DistanceSpan, and androidx.car.app.model.DurationSpan instances, any other spans will be ignored by the host.

Most templates allow up to 2 text strings, but this may vary. This limit is documented in each individual template.

Text Wrapping

For example, assuming 2 lines are allowed in the template where the row will be used, this code:

rowBuilder
    .addText("This is a rather long line of text")
    .addText("More text")

would wrap the text like this:

This is a rather long li...
More text

rowBuilder
    .addText("This is a rather long line of text. More text")

would wrap the single line of text at a maximum of 2 lines, producing a different result:

This is a rather long line
of text. More text

Note that when using a single line, a line break character can be used to break it into two, but the results may be unpredictable depending on the width the text is wrapped at:

rowBuilder
    .addText("This is a rather long line of text\nMore text")

would produce a result that may loose the "More text" string:

This is a rather long line
of text

public @NonNull Row build()

Constructs the Row defined by this builder.

public @NonNull Row.Builder setBrowsable(boolean isBrowsable)

Shows an icon at the end of the row that indicates that the row is browsable.

Browsable rows can be used, for example, to represent the parent row in a hierarchy of lists with child lists.

If a row is browsable, then no Action or Toggle can be added to it. A browsable row must have an OnClickListener set.

@RequiresCarApi(value = 5)
public @NonNull Row.Builder setEnabled(boolean enabled)

Sets the initial enabled state for Row.

The default state of a Row is enabled.

@RequiresCarApi(value = 8)
public @NonNull Row.Builder setEndImage(@NonNull CarIcon image)

Sets an image at the end of the row, with the default size IMAGE_TYPE_SMALL.

@RequiresCarApi(value = 8)
public @NonNull Row.Builder setEndImage(@NonNull CarIcon endImage, int rowEndImageType)

Sets an image to show at the end of the row content, but before the secondary actions (if set via addAction), and is distinct from the primary image set via setImage.

The end image will not be honored if the row has any of the following elements:

• A Toggle is set via setToggle.
• The row is set to be browsable via setBrowsable.
• The row is part of a selectable itemlist

public @NonNull Row.Builder setImage(@NonNull CarIcon image)

Sets an image to show in the row with the default size IMAGE_TYPE_SMALL.

public @NonNull Row.Builder setImage(@NonNull CarIcon image, int imageType)

Sets an image to show in the row with the given image type.

For a custom CarIcon, its androidx.core.graphics.drawable.IconCompat instance can be of TYPE_BITMAP, TYPE_RESOURCE, or TYPE_URI.

Image Sizing Guidance

If the input image's size exceeds the sizing requirements for the given image type in either one of the dimensions, it will be scaled down to be centered inside the bounding box while preserving its aspect ratio.

See CarIcon for more details related to providing icon and image resources that work with different car screen pixel densities.

@RequiresCarApi(value = 8)
public @NonNull Row.Builder setIndexable(boolean indexable)

Sets whether this item can be included in indexed lists. By default, this is set to true.

The host creates indexed lists to help users navigate through long lists more easily by sorting, filtering, or some other means.

For example, a media app may, by default, show a user's playlists sorted by date created. If the app provides these playlists via the SectionedItemTemplate and enables #isAlphabeticalIndexingAllowed, the user will be able to select a letter on a keyboard to jump to their playlists that start with that letter. When this happens, the list is reconstructed and sorted alphabetically, then shown to the user, jumping down to the letter. Items that are set to #setIndexable(false), do not show up in this new sorted list. Sticking with the media example, a media app may choose to hide things like "autogenerated playlists" from the list and only keep user created playlists.

Individual items can be set to be included or excluded from filtered lists, but it's also possible to enable/disable the creation of filtered lists as a whole via the template's API (eg. SectionedItemTemplate .Builder#setAlphabeticalIndexingStrategy(int)).

public @NonNull Row.Builder setMetadata(@NonNull Metadata metadata)

Sets the Metadata associated with the row.

@RequiresCarApi(value = 6)
public @IntRange(from = 0) @NonNull Row.Builder setNumericDecoration(int decoration)

Sets a numeric decoration to display in the row.

Numeric decorations are displayed at the end of the row. A numeric decoration cannot be set with only a single action which will end up only showing the action; however, the decoration may be set with 2 actions. Numeric decorations are not displayed in half-list templates.

Numeric decorations typically represent a quantity of unseen content. For example, a decoration might represent a number of missed notifications, or a number of unread messages in a conversation.

public @NonNull Row.Builder setOnClickListener(@NonNull OnClickListener onClickListener)

Sets the OnClickListener to be called back when the row is clicked.

Note that the listener relates to UI events and will be executed on the main thread using getMainLooper.

@RequiresCarApi(value = 9)
@ExperimentalCarApi
public @NonNull Row.Builder setProgressBar(@NonNull CarProgressBar progressBar)

Sets the progress bar to display in the row.

public @NonNull Row.Builder setTitle(@NonNull CarText title)

Sets the title of the row, with support for multiple length variants.

Only DistanceSpans and DurationSpans are supported in the input string.

public @NonNull Row.Builder setTitle(@NonNull CharSequence title)

Sets the title of the row.

Only DistanceSpans and DurationSpans are supported in the input string.

public @NonNull Row.Builder setToggle(@NonNull Toggle toggle)

Sets a Toggle to show in the row.

If a row has a toggle set, then no Action, OnClickListener or numeric decoration can be set.