Implement a Glance theme

Glance provides an API to manage the color theme. For other style attributes, such as TextStyle, declare top-level variables.

Add colors

Glance provides an implementation of Material colors out of the box. To use the built-in theme, wrap your top level composable with GlanceTheme, as shown in the following example.

On devices that support dynamic colors, this theme is derived from the user-specific platform colors. On other devices, this falls back to the Material baseline theme. Use GlanceTheme.colors to style with colors from the wrapped theme. You can use these values from the theme anywhere a color is needed.

override suspend fun provideGlance(context: Context, id: GlanceId) {

    provideContent {
        GlanceTheme {
            MyContent()
        }
    }
}

@Composable
private fun MyContent() {

    Image(
        colorFilter = ColorFilter.tint(GlanceTheme.colors.secondary),
        // ...

    )
}
GlanceSnippets.kt

To customize the theme, you can pass the colors to the GlanceTheme. Glance provides the androidx.glance:glance-material interoperability library for Material 2, and androidx.glance:glance-material3 for Material 3 colors support.

For example, provide your app's existing material colors to the ColorProviders API to create a Glance color scheme, as shown in the following snippet:

// Remember, use the Glance imports
// import androidx.glance.material3.ColorProviders

// Example Imports from your own app
// import com.example.myapp.ui.theme.DarkColors
// import com.example.myapp.ui.theme.LightColors

object MyAppWidgetGlanceColorScheme {

    val colors = ColorProviders(
        light = LightColors,
        dark = DarkColors
    )
}
GlanceSnippets.kt

Provide the colors from the scheme to the GlanceTheme that wraps all your composables, as shown in the following example:

override suspend fun provideGlance(context: Context, id: GlanceId) {
    // ...

    provideContent {
        GlanceTheme(colors = MyAppWidgetGlanceColorScheme.colors) {
            MyContent()
        }
    }
}

@Composable
private fun MyContent() {

    Image(
        colorFilter = ColorFilter.tint(GlanceTheme.colors.secondary),
        // ...
    )
}
GlanceSnippets.kt

If you prefer to use dynamic colors from the wallpaper when supported, and your app's color scheme otherwise, you can conditionally pass your app's color scheme in the GlanceTheme. This is shown in the following snippet:

override suspend fun provideGlance(context: Context, id: GlanceId) {

    provideContent {
        GlanceTheme(
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S)
                GlanceTheme.colors
            else
                MyAppWidgetGlanceColorScheme.colors
        ) {
            MyContent()
        }
    }
}

@Composable
private fun MyContent() {
    // ...
    Image(
        colorFilter = ColorFilter.tint(GlanceTheme.colors.secondary),
        // ...
    )
}
GlanceSnippets.kt

Add shapes

To provide special shapes or shadows to your app widget, use the Android Drawables API.

For example, the following snippet shows how to create a drawable (a shape):

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="16dp"/>
    <stroke android:color="@color/outline_color" android:width="1dp"/>
</shape>
button_outline.xml

Provide it to the target composable:

GlanceModifier.background(
    imageProvider = ImageProvider(R.drawable.button_outline)
)
GlanceSnippets.kt