Font

Provides rendering instructions for a specific text element.

Introduced in Wear OS 4.

Syntax

<Font family="string | SYNC_TO_DEVICE" size="float"
      color="argb-color | rgb-color" slant="NORMAL | ITALIC"
      letterSpacing="em-value"
      width="ULTRA_CONDENSED | EXTRA_CONDENSED | CONDENSED | SEMI_CONDENSED |
             NORMAL | SEMI_EXPANDED | EXPANDED | EXTRA_EXPANDED |
             ULTRA_EXPANDED"
      weight="THIN | ULTRA_LIGHT | EXTRA_LIGHT | LIGHT | NORMAL | MEDIUM |
              BOLD | SEMI_BOLD | ULTRA_BOLD | EXTRA_BOLD | BLACK | EXTRA_BLACK">
    <!-- Inner elements consist of text decoration and text formatting
         options. Here, "Lower" is used as an example. -->
    <Lower ... />
</Font>

Attributes

The Font element has the following attributes. Some attributes are required while others are optional.

Required attributes

The following attributes are required:

family

The name of the font used for rendering the text. To use the same font family as the system, set this value to SYNC_TO_DEVICE.

To use a custom font, place the font file in res/font/, using one of the following accepted font file extensions: TTF, OTF, TTC, or XML. Then, set this value to the name of the font file, excluding the extension at the end.

If the font file cannot be resolved, the system font is used.

size

A floating-point value that specifies the text size.

Optional attributes

The following attributes are optional:

color

The color of the text. If provided, you must specify the color using either the ARGB format (#ff000000 = opaque black) or the RGB format (#000000 = black).

From version 4, this attribute is transformable.

letterSpacing

The space between letters, specified in EM units. The default value is 0. An example for slight expansion could be 0.05. Negative values tighten text.

slant

Whether to use a NORMAL font slant (default) or an ITALIC slant.

width

An enumeration of several hints for a font family variant to use. The default value is NORMAL, which applies the "normal" variant of the font.

The following list contains the other enumeration values and the respective font family variants that they use, if that variant is available for the font:

  • ULTRA_CONDENSED and EXTRA_CONDENSED use the "condensed-light" variant.
  • CONDENSED uses the "condensed" variant.
  • SEMI_CONDENSED uses the "condensed-medium" variant.
  • SEMI_EXPANDED, EXPANDED, EXTRA_EXPANDED, and ULTRA_EXPANDED each use the "normal" variant.
weight

An enumeration of several possible font weights. The default value is NORMAL, which applies a weight of 400.

The following list contains the other enumeration values and their respective font weights:

  • THIN uses a font weight of 100.
  • ULTRA_LIGHT uses a font weight of 150.
  • EXTRA_LIGHT uses a font weight of 200.
  • LIGHT uses a font weight of 300.
  • MEDIUM uses a font weight of 500.
  • SEMI_BOLD uses a font weight of 600.
  • ULTRA_BOLD uses a font weight of 750.
  • EXTRA_BOLD uses a font weight of 800.
  • BLACK uses a font weight of 900.
  • EXTRA_BLACK uses a font weight of 1000.

Inner elements

The Font element can contain the following inner elements: